129results about How to "Strong torsion resistance" patented technology

The invention relates to an integrated working machine for a non-excavation pipeline, belonging to the field of engineering machinery. A rigid working head, a supporting machine, a pipe wall tensioning machine, a spiral pusher, a supporting machine and a control box are spliced to form the integrated working machine for the non-excavation pipeline. The working machine provided by the invention isspecial machinery specially used in cleaning silt, cleaning and checking the dragging and pushing operation in a pipe for a pipeline at the state of non-excavation, and can maintain the partial defects of the inner part of the pipe. The working machine has the advantages of small flooring area, low noise, rapid speed, high concealment, good enginnering safety and civilized construction, does not damage to the ground environment, does not influence traffic, the normal life and working order for people, is environmentally-friendly construction machinery, and is good helper for management pesonnel and maintaining personnel for city management; and the machine has the advantages of working efficiency, low construction cost, energy conservation, time and labor conservation, and high automoticity and is simple in operation, is convenient to maintain the pipeline, the service life of a pipe body is prolonged, the operation cost of the pipeline is reduced, and the econimoc benefit is improved.

The invention relates to a hinged system of a low-floor hinged type train or coach. A front frame and a rear frame are fixedly connected with a rotary plate bearing respectively, and the front end of the front frame and the rear end of the rear frame respectively form a pitch axis. Preferably, each pitch axis comprises a spherical hinge, a spherical hinge installing hole and a spherical hinge fixing base. The spherical hinges can be inserted into the spherical hinge installing holes movably and fixed in the spherical hinge fixing bases. The front end of the front frame and the rear end of the rear frame are respectively provided with the spherical hinge installing holes. Mechanical lock devices are arranged on the front frame and the rear frame symmetrically in the right and the left directions. A super-angle sensing device is arranged on the rear frame. A rotary plate platform is arranged on the front frame, a front adhesive tape is fixedly connected with an adjacent carriage floor, and a rear adhesive tape is fixedly connected with the rotary plate platform and arranged below the front adhesive tape. The hinged system is good in torsion resistance and buffering effect, the front frame and the rear frame respectively form the pitch axis, even if a vehicle is pitched and overturned or moves vertically in a driving process, each pitch axis can move correspondingly, the vehicle can run smoothly without damage, and the hinged system is suitable for massive popularization and application.

The present disclosure provides a lightweight steel-coarse aggregate reactive powder concrete composite beam structure which comprises a plurality of segments, each segment comprising: a steel box girder comprising a bottom plate, a plurality of steel box girder webs and a plurality of steel box girder diaphragms. A coarse aggregate reactive powder concrete bridge deck comprises a plurality of precast bridge decks, a longitudinal wet joint and a transverse wet joint. A plurality of T-shaped pre-embedded steel plates are arranged on the bottom surface of the pre-fabricated bridge deck, the webplate thereof is connected with the steel box girder cross diaphragm plate, the top surface of the T-shaped pre-embedded steel plate is welded with a shear connector, and the shear connector is pre-embedded in the pre-fabricated bridge deck, so that the T-shaped pre-embedded steel plate and the pre-fabricated bridge deck form an integral whole. The invention can improve the mechanical performanceof the steel-concrete composite beam, enlarge the applicable span and scope, improve the construction speed and process quality of the bridge engineering, and overcome the problems of self-weight of the traditional steel-concrete composite beam and easy cracking of the bridge deck without reducing the mechanical performance of the concrete bridge deck.

The invention discloses a concrete-filled steel tube sleeper for a ballastless track. The concrete-filled steel tube sleeper for the ballastless track comprises two or more sleeper concrete blocks and sleeper connecting parts used for connecting the sleeper concrete blocks. Each sleeper concrete block is of a block-shaped structure and formed by pouring concrete, and each sleeper concrete block is internally provided with an embedded part for fixing the steel track and a steel-bar mesh or a stirrup connected with the corresponding sleeper connecting part. Each sleeper connecting part is composed of a plurality of hollow steel tubes transversely arranged between the corresponding sleeper concrete blocks. In the pouring process of the sleeper concrete blocks, the hollow steel tubes are filled with concrete at the same time, so that concrete-filled steel tubes are formed, and accordingly the sleeper connecting parts and the sleeper concrete blocks are integrated through pouring. The concrete-filled steel tubes are applied to the concrete sleeper for the ballastless track, the concrete-filled steel tubes are used as the sleeper connecting parts, and the concrete-filled steel tubes and the sleeper concrete blocks are formed integrally, so that the geometry retention capacity of the sleeper is effectively improved, and steel consumption is reduced; the sleeper has the advantages of being easy to manufacture, high in constructability and the like.

The invention provides a method for manufacturing a silicon rubber compound insulator. The method comprises the following steps: plating zinc on hardware: the upper end hardware and the lower end hardware are plated with zinc respectively; milling an epoxy glass fiber thread core rod; pressing and connecting the zinc-plating hardware and the epoxy glass fiber thread core rod: the zinc-plating hardware and the epoxy glass fiber thread core rod which are pressed and connected are put in a drying oven for drying and pre-heating; evenly coating a coupler on the surface of the pre-heated epoxy glass fiber thread core rod; putting the epoxy glass fiber thread core rod of which the surface is coated with the coupler and silicon glue in a mold cavity for mold pressing; putting a mold pressing product in a high-temperature cabinet for secondary sulfuration; and passing a test to obtain a finished product. The method has the advantages of scientific process, simple operation steps, strong practicability and scientific improvement on the prior process; and the insulator prepared by the method has the remarkable advantages of improving all technological properties, strong stretch resistance and torsion resistance, good corrosion resistance and insulating property and long service life.

The invention discloses a steel pipe concrete sleeper suitable for ballastless tracks, which comprises two or more sleeper concrete blocks and a sleeper connecting piece for connecting the sleeper concrete blocks, the sleeper concrete block is in a block structure, and is made of concrete It is made by pouring, and there are embedded parts for fixing the rails and steel mesh or stirrups connecting the sleeper connectors; the sleeper connectors are composed of a plurality of hollow steel pipes arranged horizontally between the concrete blocks of the sleeper. During the block pouring process, the hollow steel pipe is filled with concrete at the same time to form the concrete filled steel pipe, and then the sleeper connector and the concrete block of the sleeper are poured into one body. In the invention, the concrete-filled steel tube is applied in the concrete sleeper of ballastless track, the concrete-filled steel tube is used as the connector of the sleeper block, and the concrete-filled steel tube and the concrete block of the sleeper are integrally formed, so as to effectively increase the geometric shape and position retention capacity of the sleeper, reduce the amount of steel, and have the advantages of simple preparation , Strong constructability and so on.

The invention provides a high strength novel hollow insulation composite pipe, comprising an inner pipe and an outer pipe bonded with the inner pipe, wherein the outer pipe is provided with a strengthened bonding layer formed by the glass fiber cloth or glass fiber felt enclosing along the circumference of the composite pipe; the strengthened bonding layer and the glass fiber threads of multistrand impregnating resins are solidified into the outer pipe; when the invention is manufactured, the strengthened bonding layer can be formed on the outer pipe without turning the inner pipe, which is more convenient for manufacturing; moreover, fibers in the glass fiber cloth and the glass fiber felt are staggered, thereby the manufactured outer pipe has better capability of resisting the thermal expansion and cold contraction of the inner pipe when the inner pipe is moistened and the torsional resistance of the hollow insulation composite pipe gets better.

The invention discloses a telescopic handler which comprises a front driving axle and a back driving axle which are provided with tires, a front frame, a back frame, an auxiliary frame, a cab, an engine, a counter weight block and a working device. The working device comprises a movable arm, two movable arm oil cylinders, two rocker arms, a rotating bucket oil cylinder, two pull rods and an object fork. The lower end of the movable arm is hinged on the upper portion of the front frame, the upper end of the movable arm is hinged on the back lower portion of the object fork, the lower ends of the two movable arm oil cylinders are respectively hinged on two sides of the lower portion of the front frame, and the upper ends of the two movable arm oil cylinders are hinged on two sides of the middle of the movable arm. The lower ends of the two rocker arms are hinged on two sides of the middle of the movable arm, the lower end of the rotating bucket oil cylinder is hinged on the upper side of the lower portion of the movable arm, the upper end of the rotating bucket oil cylinder is hinged with the upper ends of the two rocker arms through a connection rod, one ends of the two pull rods are hinged at the position of the rocker arms close to the upper end, and the other ends of the two pull rods are respectively hinged on the back upper portion of the object fork. The telescopic handler is capable of forking materials with large size and weight, long in unloading distance, large in unloading angle and flexible to operate.

The invention provides an FRP-bamboo-concrete combination beam which is characterized in that the structure comprises a bamboo material (1), an FRP tendon (21) or an FRP fabric (22), concrete (3) and a connecting part (4) which are combined together into the FRP-bamboo-concrete combination beam, wherein the FRP tendon (21) or the FRP fabric (22) is positioned in the cross section of the lower-middle part or positioned at the bottom of the bamboo material (1) to bear tension stress, the concrete (3) is positioned at the top or on the two sides of the middle-upper part of the bamboo material (1) to bear compression stress, and the concrete (3) is tightly connected with the bamboo material (1) by the connecting part (4). By making full use of the characteristics of the three materials, the invention greatly improves the sectional inertia moment of the original bamboo beam, thereby effectively improving the rigidity of the original bamboo beam member. The combination beam has the advantages of light weight, high bearing capacity, high rigidity, good torsional resistance, good ductility, high self recovery capability and the like, and can be used as the bending member in the field of a civil construction structure.

The invention relates to a special-shaped composite material shaft, a preparation method thereof, and a connecting method of the special-shaped composite material shaft and metal couplings. According to the preparation method, a method including winding inflatable and deflatable central spindles with a prepreg tape and curing molding is adopted, a first inflating central spindle and a second inflating central spindle are formed and arranged, the prepreg tape is used for winding the central spindles in an inflating state, then the second inflating central spindle is squeezed to tension the prepreg tape and enable the prepreg tape to be adhered to the surface of the first inflating central spindle. According to the method, the special-shaped composite material shaft provided with bulges can be prepared; bulge parts and a shaft body are enhanced by continuously winding the prepreg tape; and the prepared composite material shaft is high in strength and good in performance, and can be connected with the metal couplings. According to the connecting method of the metal couplings and the composite material shaft, the bulges at two ends of the composite material shaft are inserted into connecting holes of the metal couplings, the defect that bolts and other connection manners influence product performance is avoided, and the method has the advantages of high connecting strength, stable structure and strong torsion resistance.

The invention discloses sliding block mechanisms which are respectively used on a thrice quartered variable-pitch louver and a double dichotomy variable-pitch louver and a variable-pitch louver sliding block system with one of the two sliding block mechanisms. The variable-pitch louver sliding block system comprises gear torsion spring clutch turnover mechanisms, a base and a top cover, wherein the sliding block mechanisms are tightly adjacent to the gear torsion spring clutch turnover mechanisms, the sliding block mechanisms and the gear torsion spring clutch turnover mechanisms are all arranged on a rotating shaft of the sliding block mechanisms, each gear torsion spring clutch turnover mechanism comprises a fixing sleeve, a torsion spring, a torsion spring unlocking gear, a clutch gear and a fixing nut which are sequentially sleeved on the rotating shaft, and the torsion spring unlocking gears are connected with the sliding block mechanisms through a clamping part in a transmission way. According to the sliding block mechanisms and the variable-pitch louver sliding block system, which are disclosed by the invention, an existing sliding block mechanism and an existing variable-pitch louver sliding block system are improved, the problems that a torque transmission piece is not synchronous with a turnover drum, and ladder belts are easily abraded are effectively solved, and the sliding mechanisms are also suitable for the double dichotomy variable-pitch louver.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge comprises bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), transverse pre-stressing tendons (4) and longitudinal pre-stressing tendons (16), the outer surface of a bamboo is sequentially and uniformly coated with a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resorcinol formaldehyde resin, and the expansion coefficients of the four coating layers are sequentially lessened from the outer surface of the bamboo to outside. The assembly type bamboo bridge provided by the invention has the advantages that the structural strength is large, the ductility is good, a selected material is environment-friendly, standardization degree and assembling degree of structural members are high, the structural integrity is good, the advantages of the material can be fully expressed, and the requirements on normal use and durability of a bridge structure can be met.

The invention relates to a hanging device. The hanging device is arranged between a left wheel and a right wheel under a vehicle body, and comprises a first wheel bracket, a second wheel bracket, a first air spring, a second air spring, a first longitudinal swinging assembly, a second longitudinal swinging assembly, a first Panhard rod, a second Panhard rod, a first air spring support frame, a second air spring support frame and a vehicle body welding support frame. The hanging device has the beneficial effects that the air springs are used for buffering vibration, the taking comfort is improved, a magnetorheological shock absorber is used for attenuating the vibration, the damping is regulated for absorbing energy, the vibration is perfectly attenuated, the structure and material selection of a longitudinal swinging arm is optimized, higher intensity impact and fatigue durability can be borne, in addition, the weight is relatively light, the structure design of stabilizing rods is delicate and ingenious, the material selection is excellent, higher torsion resistance, rigidity and fatigue resistance characteristics are realized, and good effects are achieved for realizing operation and control stability.

The invention provides a hoop type connecting structure for composite thin-walled circular pipes, and belongs to the technical field of composite connection. The problems existing in connection of the composite thin-walled circular pipes at present are solved. The hoop type connecting structure comprises the two pipes to be connected, and is characterized in that butt-joint ports of the two pipes to be connected are each provided with a flange, and the two flanges are in butt joint; two opposite hoops are arranged around the flanges, and the two hoops are connected through two or more bolts; clamping grooves in tight fit with the two flanges are formed in the inner sides of the two hoops respectively, two parallel planes are arranged on the two opposite sides of each flange respectively, and the two ends of each clamping groove are matched with the planes in shape. The hoop type connecting structure is used for connecting the composite thin-walled circular pipes.

The invention relates to a column type elastic body which comprises a fixed portion, a bearing portion and a strain portion. The fixed portion and the bearing portion are arranged on two sides of the elastic body, the strain portion is fixed between the fixed portion and the bearing portion and comprises two ring grooves arranged on the elastic body, strain holes arranged between the two ring grooves, and strain pieces fixed in the strain holes, a sleeve is sleeved at the elastic body of the strain portion, two ends of the sleeve are respectively connected with thin walls outside the ring grooves, an overload protection mechanism formed by bent notches is arranged on one side, facing the bearing portion or / and the fixed portion, of the elastic body of the strain portion, clearances between the bent notches are overload clearances beta, outside notches of the bent notches extend to the periphery of the elastic body, inside notches of the bent notches are communicated with deformation holes outside the strain holes, or the inside notches of the bent notches are communicated with the strain holes. The column type elastic body is good in manufacturability and capable of realizing dynamic weighing safety protection.

The invention discloses an optical fiber grating vibration sensor made of multi-cantilever beam all-insulation materials. The optical fiber grating vibration sensor comprises a vibration sensing system, a base and a top cover. The vibration sensing system comprises a mass block, four cantilever beams with equal lengths and a frame, and the frame is connected with the cantilever beams. The mass block is connected with the frame by the four slice cantilever beams and is supported and suspended by the cantilever beams. Four protruded quadrangular columns with equal heights are arranged at four corners of the base of a sensor, the vibration sensor is arranged in the base, and the frame of the sensor is exactly clamped on the surfaces of the four quadrangular columns, so that the vibration sensor can be suspended in the base. The optical fiber grating vibration sensor has the advantages that the cantilever beams can be driven by the mass block to vibrate along with the mass block when the sensor feels vibration, the wavelengths of a grating adhered on the mass block can vary, and vibration frequencies can be measured according to variation of the wavelengths of the grating; the mass block is fixed by the aid of the four cantilever beams, accordingly, the anti-jamming capacity can be enhanced, high-order modal resonance can be inhibited, vibration signals can be sensitively detected,and excellent insulation effects can be realized by the optical fiber grating vibration sensor owing to the insulation properties of the nonmetal materials.

The invention provides a processing method of a universal joint precision forging with R arc end faces. The processing method comprises the steps of blanking, shot blasting, surface coating, blank heating, forging, quick air cooling after normalizing, shot blasting, phosphorus saponification and cold extrusion forming. Circular arc cold extrusion forming structures are arranged at the parts, corresponding to R arcs of the end faces of the universal joint, of a cold extrusion forming mold. According to the processing method of the universal joint precision forging with the R arc end faces, an original processing technology is improved, during final universal joint cold extrusion forming, circular arc cold extrusion forming surfaces are arranged at the parts, corresponding to the R arcs of the end faces of the universal joint, of the cold extrusion forming mold, and besides, two rods of the universal joint are formed at a time in a forward extrusion mode by virtue of the extrusion mold,so that the metal streamline distribution situation of the forging is excellent, quality of the forging is higher, follow-up machining is not required, and a prepared product is high in strength and excellent in anti-twisting property.

The invention relates to a turntable bearing in a chassis articulated system of an articulated vehicle. The articulated system comprises a front frame, a rear frame and the turntable bearing, wherein the turntable bearing comprises an outer ring and an inner ring; the rear frame is fixedly connected with the inner ring; a steel ball rolling way is formed between the outer ring and the inner ring in the circumferential direction; the outer ring consists of a first outer ring and a second outer ring; a concave step part is formed at the lower end of the second outer ring in the circumferential direction; the first outer ring is arranged on the step part of the second outer ring; and the second outer ring is connected with the front frame into a whole. The turntable bearing has a skilful design, a simple and compact structure, high reliability, light weight and long service life and is easy to process.

A flexible screw comprises an elastic spindle and more than two elastic wire layers tightly wrapping the elastic spindle. Each elastic wire layer is made by winding one or plurality of elastic wires. The elastic wires in the adjacent layers are wound in opposite directions. The outermost layer of elastic wires is further provided with a screw thread; the screw thread and the elastic wires are wound alternately; the height of an operating face of the screw thread is unequal to that of the elastic wires. The flexible screw comprises the elastic spindle, the elastic wires and the screw thread; the elastic spindle is of good elasticity; the elastic wires enhance torsion resistance of the screw; the screw thread is high in hardness and is spirally around the elastic spindle; accordingly, the flexible screw has good axial deforming capacity and as good as a flexible shaft in torsion resistance; meanwhile, the screw thread has high hardness, and the flexible screw can serve as a guide rail or guide channel for use with a screw assembly. The flexible screw can be bent according to users' needs and can be used in a non-linear form, and the screw assembly can move in a curvilinear form.

The invention relates to the technical field of novel material application, in particular to an environment-friendly flexible cable with high flame retardance and super low temperature resistance. The environment-friendly flexible cable with the high flame retardance and the super low temperature resistance comprises a flexible twisted conductor, an insulating layer and an outer protective layer, wherein the insulating layer is wrapped outside the flexible twisted conductor to form single insulated wires; the outer protective layer wraps at least two single insulated wires; the insulating layer and the outer protective layer are made from the same materials, take an ethylene-propylene-diene monomer as a disperse phase and take polypropylene as a continuous phase; the insulating layer contains a plasticizer which is cold-resistant, and also contains 30 to 40 parts of paraffin oil, 2 to 6 parts of cross linking agent and 50 to 70 parts of flame retardant; and the outer protective layer contains the plasticizer which is cold-resistant, and also contains 30 to 40 parts of paraffin oil, 2 to 6 parts of cross linking agent and 50 to 70 parts of flame retardant. Due to the adoption of the technical scheme, the environment-friendly flexible cable with the high flame retardance and the super low temperature resistance has high torsion resistance, the super low temperature resistance and flame retardance, is difficult to age and crack and environment-friendly, and can work stably in low temperature environments of below -60 DEG C.

The invention provides a novel energy-saving bamboo bridge. The novel energy-saving bamboo bridge comprises longitudinal bamboo beams (1), transverse bamboo beams (2), bamboo panels (3), transverse pre-stressed trusses (4) and longitudinal pre-stressed trusses (16). A layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resorcinol formaldehyde coat the outer surfaces of all the bamboo materials of the bamboo bridge in sequence. The bamboo bridge further comprises lighting devices and a brightness sensor, and the lighting devices are controlled to be started through the numerical value measured by the brightness sensor. The novel bamboo bridge can start the lighting device according to the brightness and save energy sources.

The invention relates to a mute barbell roller bearing which has a structure support technology that is characterized in that the external dimension standard of the mute barbell roller bearing is in line with the technical standard of an international general roller bearing of international standardization organization (ISO). The mute barbell roller bearing is formed by correspondingly matching an inner sleeve ring formed by two separated rings 1, a row of barbell rollers 3, an outer sleeve ring 2 and an invisible retainer 4. The invention aims at solving the technical problem that the traditional N-type series cylindrical roller bearing is not capable of thrusting. The mute barbell roller bearing has the most remarkable selling points that (1) the dynamic flexibility is improved by 20%; (2) the jump noise is reduced by 5-14 decibels (dB); (3) the rotating speed is accelerated by 12-30%; (4) the loading capacity is increased by 30-50%; (5) the safety factor is increased by 2%; (6) a sealing cover can be arranged on the mute barbell roller bearing; (7) axial thrust capability is improved by 70%; and (8) the servo life is prolonged by 14-30%, therefore, the mute barbell roller bearing is a three generation leading edge innovative technology product which is economical and environment-friendly.

The invention discloses an integrated ground heating floor, the upper surface of a ground heating thermal-insulation basal plate (4) is provided with a ground heating trough (1) in which a ground heating tube is paved, and a metal floor (3) is arranged on the upper surface of the ground heating thermal-insulation basal plate (4). The invention is the integrated ground heating floor which has fastheating, convenient maintenance, long service life, environmental protection without harms, simple structure and reliable performance and is used for heating in winter for household and various publicoccasions (closed).

The invention discloses a rig frame of a drilling rig. The rig frame of the drilling rig comprises a rig frame front part and a rig frame rear part which are mutually connected, wherein the rig frame front part is of a channel beam structure, and the rig frame rear part is of an integral box-type structure. The integral box-type structure is free of the problem of rig frame connection, so that the problem of connecting misplacement of a main rig frame and a secondary rig frame in the prior art is resolved. In addition, the bending resistance and the torsion resistance of the integral box-type structure are high, the inertia moment of the cross section is strengthened, the stress of the whole drilling rig is improved, and the working stability of the rig frame is improved. Due to the fact that inertia moment of the cross section is decided by the size of a box and has little relationship with plate thickness, after a double-layer connecting structure combined by a mediate and small box and channel beams in the prior art is changed into the larger integral box-type structure, on the premise that the rigidity and the strength are guaranteed, the wall thickness of the rig frame rear portion can be appropriately reduced, and the weight of the rig frame is lowered. In addition, after the rig frame rear portion is of the integral box-type structure, an operator does not need to buy a universal chassis to modify the rig frame, and production cost is lowered.

The invention discloses a numerical control turning and milling composite machine tool. The numerical control turning and milling composite machine tool comprises a machine tool body, wherein a main shaft box, a tail base, a control system, a lubricating system and a flat bed back X-axis, Y-axis and Z-axis mechanism are arranged on the machine tool body; a motor is arranged on the main shaft box and is connected with a main shaft of the main shaft box through a driving mechanism; a power cutter tower is arranged on the flat bed back X-axis, Y-axis and Z-axis mechanism; a hydraulic system is arranged on the rear side of the machine tool body and is respectively connected with the main shaft box, the tail base and the power cutter tower; and the control system is connected with the lubricating system, the hydraulic system and the flat bed back X-axis, Y-axis and Z-axis mechanism. The numerical control turning and milling composite machine tool is reasonable in internal structure layout, better in using performance and higher in work reliability.

The invention provides a novel ramp bridge structure and a construction method thereof and belongs to civil construction engineering structures. The novel ramp bridge structure is mainly composed of a steel box beam with an asymmetric curve section, a pylon, stay cables, single-column piers, an integrated bridge abutment, disc type anchoring devices, bolt pins, double-lug plates, threaded sleeves and a single lug plate. The novel ramp bridge structure and the construction method of the novel ramp bridge structure have the advantages that the curve beam is of a steel box beam structure and has good torsional property, and the self-weight of the structure is reduced; the section of a beam body is in an asymmetric form, load of the upper structure is borne by the piers and the stay cables jointly, and tumbling damage of the upper structure is avoided while the number of the single-column piers is not increased; the inclined pylon without backstays are utilized to balance horizontal branch force of the stay cables to reduce the internal bending moment of the pylon; the integrated bridge abutment is adopted to provide reliable torsional support for the curve beam and improve the durability and the driving comfort degree of a ramp bridge. The novel ramp bridge structure is suitable for design of most expressway ramp bridges, reliable in structural stress and elegant in modeling and has a certain uniqueness and advantage.

The invention discloses a hot extrusion forming method of a special-shaped square tube. The special-shaped square tube is a square steel tube which is square outside and round inside. The forming method of the special-shaped square tube comprises steps as follows: (1), material inspecting and processing; (2), centering boring; (3), heating treatment; (4), molding ; (5), hot extrusion; (6), demolding; (7), post-processing. According to the hot extrusion forming method of the special-shaped square tube, the technological design is reasonable, the mold structure is simple, the operation is convenient and easy, the forming speed is high, the efficiency is high, and the method is applicable to large-scale industrial production and provides a guidance for the preparation of special-shaped tube stocks; furthermore, the prepared special-shaped square tube has a high finished product rate, high bending resistance and torsion resistance and excellent comprehensive property, and the application field of the special-shaped square tube is effectively broadened.

The invention discloses an ultrastrong diamond compact bit belonging to rock-breaking tools, which is mainly applicable to coal-mine gas drainage holes, water detection holes, grouting holes and geological prospecting drilling holes. The ultrastrong diamond compact bit comprises a drill stem and a drill bit, wherein the drill stem and the drill bit are connected through screw threads. The bit is characterized in that the drill bit is composed of a diamond compact, a rock-breaking column, a water hole and a gauge-protection bar, wherein the drill bit is inlaid with the rock-breaking column and brazed with the diamond compact and the gauge-protection bar. The ultrastrong diamond compact bit can drill into medium hard rock stratum, and has the advantages of excellent wear resistance, strong torsion resistance, faster rock breaking speed, good cooling and scrap removal, inconspicuous gauge shrinkage phenomenon and high construction efficiency.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge consists of bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), a transverse pre-stressing tendon (4) and a longitudinal pre-stressing tendon (16). All bamboos used by the assembly type bamboo bridge are soaked in a gum dipping tank which contains polyurethane resin and phenolic resin before being assembled, and boiled for 10-15 minutes at 100 DEG C-110 DEG C, wherein the volume ratio of the polyurethane resin to the phenolic resin is (2-2.5):1; and then, the bamboos are got out and dried, and a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resurcinolformaldehyde resin are uniformly coated on the outer surfaces of all bamboos in sequence. The assembly type bamboo bridge is large in structural strength, good in drawability, green and environment-friendly in used materials, standard in structural components, high in assembly degree, good in structural integrity, and capable of sufficiently bringing the advantages of the materials into play, and satisfying the normal use and durability needs of the bridge beam structure.

The invention discloses a layout structure of a numerical control machine tool. In the whole current machine tool industry, a slant bed body is adopted mostly as the bed body of a turning center, and the conventional structural layout of arranging two spindles and turrets opposite to each other respectively is adopted. In the designed machine tool structure, a rectangular flat bed body is adopted, and a symmetrical structure is formed by arranging two spindles and two turrets in parallel. Since two spindle boxes are arranged in parallel and two turrets are arranged in parallel on the machine tool body, the layout structure has the advantages of light mass, compact distribution, very high torque resistance and shock resistance, and higher accuracy and roughness of machined workpieces.