709results about How to "Large span" patented technology

The hollow floor slab includes column, solid belt, solid reinforced beam with dense ribs, reinforced facing board, and composite box with lower thin bottom board. The production process includes: a) laying and tying reinforcing steel bar in the floor slab formwork; b) laying the steel wire net and other reinforcing material; c) setting and fixing made composite thin box; d) tying reinforcing steel bar for the facing board; e) fixing reinforcing bars with iron wire; and f) embedding prefabricated pipeline inside the facing board and the dense ribs. The present invention may produce flat sealed floor slab cavity with dense ribs in once deposition.

Improvements to the hinge of a folding aircraft wing including a load bearing hinge mechanism with multiple locking mechanisms. The mechanism includes rigid panels that cover the hinge area when the wing is deployed, and the wing itself covers the hinge area when the wing is retracted. A control lever is used to actuate the wing and incorporates safety features to prevent unwanted actuation.

A method for controlling gear shifts in a multiple speed power transmission for a vehicle that includes a first clutch for transmitting power through a first power path producing a reverse gear, and a second clutch for transmitting power through a second power path producing a forward gear. The method includes selecting a reverse range in which the transmission is to operate, preparing the transmission to transmit power alternately through the first power path and second power path; engaging the first clutch and transmitting power through the first power path in the reverse gear, selecting a forward range in which the transmission is to operate, disengaging the first clutch and engaging the second clutch, and transmitting power through the second power path in the forward gear.

The invention relates to a novel prestress industrial stockyard canopy structure and a method for constructing the same. The novel prestress industrial stockyard canopy structure comprises a plurality of span prestress steel trusses and a plurality of spatial string beams. The span prestress steel trusses are transversely and parallelly arranged, the spatial string beams are longitudinally arranged, and the prestress steel trusses and the spatial string beams are connected with one another to form an integral structure. The method for constructing the novel prestress industrial stockyard canopy structure which is a combination structure with the prestress steel trusses and the spatial string beams includes designing the structure; determining construction schemes; grouping the trusses; splicing the steel trusses on the ground; setting temporary support scaffolds; mounting longitudinal stable trusses; constructing the spatial string beams, and the like. The novel prestress industrial stockyard canopy structure and the method have the advantages that the spatial string beams and the prestress steel trusses are combined with one another, structural merits of the spatial string beams and the prestress steel trusses are sufficiently played, and accordingly the building structure can be optimized in the aspects of modeling, utilized spaces, manufacturing cost, construction, installation and transportation.

The invention provides an especial-big span suspension bridge of a uniparted hyperboloid space rope net main cable and a construction method thereof. A straight line character of the uniparted hyperboloid is used to change a vertical parallel cable rope system of an original suspension bridge. A thick and heavy centralized cable rope is changed into a dispersive space steel wire cable rope. Multiple strand of steel wire cable ropes are arranged in a cross mode. Space rope net main cable-cross nodes are fixed to form a space cable rope system of the uniparted hyperboloid type. An oval steel strengthening ring beam is arranged. A suspender and a stiffening beam are installed. A gate-type rigidity middle buckle is arranged. The especial-big span suspension bridge of the uniparted hyperboloid space rope net main cable system is built. The especial-big span suspension bridge of the uniparted hyperboloid space rope net main cable system has the advantages of being strong in span capacity, large in space structure rigidity, high in screw frequency ratio, good in wind resistance stability and the like. The novel space main cable system suspension bridge is capable of radically saving the problem of the wind resistance stability of the big span suspension bridge and used for projects of a striding sea connected island. The especial-big span channel suspension bridge of 3000-5000 meters is built.

The invention relates to an assembling type pre-stress honeycombed ribbed web steel beam and belongs to the technical field of a building section bar. The assembling type pre-stress honeycombed ribbed web steel beam is formed by assembling two butt-joint pre-stress ripple web ribbed steel channel beam webs through bolts. Each pre-stress ripple web ribbed steel channel beam is formed by a top flange, a web, a bottom flange, a pre-stress cable, transverse stiffening ribs, anchorage devices and beam end plates. A section die of the pre-stress ripple steel channel beam web is formed by the top flange, the bottom flange and the web; the section of the web is in a uniform or non-uniform periodically-repeated waveform; the transverse stiffening ribs are vertically placed among the two flanges and the web; the beam end plates are parallel to the transverse stiffening ribs and are arranged at the two ends of the beam; and the pre-stress cable is tensioned and then is fixed on the beam end plates through the anchorage devices. The assembling type pre-stress honeycombed ribbed web steel beam disclosed by the invention is a novel assembling type pre-stress steel beam which is applicable to an assembling type steel structure system, particularly a large-span multi-story assembling type steel structure system; and compared with a conventional assembling type beam, the steel beam has the advantages of light self weight, high bearing capability, great span and the like.

Disclosed is a prestressed concrete on-site pouring hollow slab filled with light material combined unit, which comprises light material combined unit, upper layer reinforcing steel bar, lower layer reinforcing steel bar, tendon, blind beam reinforcing steel bar and concrete. The light material combined unit consists of light tubes and connection bar, which is arranged between the upper layer reinforcing steel bar and the lower layer reinforcing steel bar, the combined unit tubes is in the same direction with the bigger bending moment within the slab, The blind beam is arranged at intervals of a certain distances, in which the tendon is centralized laid. Said on-site pouring slab has the advantages of both the prestressed structure and the hollow slab structure, has high hollow percentage, implements one time concrete pouring moulding, is suitable not only for one-way slab, but also for two-way slab. The slab has big span, light weight, good heat and sound insulation effects, good reliability, shock resistance and crack resistance.

A PSSC complex girder in which a section shape steel structure is formed by joining one or more section shape steel. The PSSC complex girder includes a tension means for tensioning the section shape steel structure with a tensional member so that the structure has a predetermined camber. Concrete is poured in an inner space portion of the section shape steel structure. A strengthening plate for supporting buckling and compression is joined to the section shape steel. A sheer prevention member and steel reinforcement are joined to the section shape steel and the concrete is poured therein. The camber of the PSSC complex girder can be adjusted before or after construction for new bridges and conventional bridges. Deflection of the slab can be easily decreased and cracks caused by flexural deformation can be prevented.

The invention relates to a composite frame system with beam column flanges being made of steel pipe concrete and a construction method. The composite frame system with the beam column flanges being made of the steel pipe concrete is formed by connecting composite columns with composite beams through joints. The composite beams are horizontally arranged among the composite columns. The joints are steel pipe concrete integral type joints. The composite columns are cross-shaped or I-shaped composite columns with the flanges being made of the circular steel pipe concrete. The composite beams are I-shaped honeycombed beams with the flanges being made of the steel pipe concrete. The joints and the composite columns are fixedly connected at respective connecting plates through high-strength bolts. The joints and the composite beams are connected through buffer sections which are I-shaped honeycombed beams with the flanges being made of the steel pipe concrete. The cross sections of the buffer sections are variable cross sections gradually diminished from the two ends to the centers, and the cross sections of the buffer sections are smallest at the midpoints. The problems that according to an existing steel-concrete composite structure, construction is complex, connection and stability between the composite structure are poor, and the joints are liable to damage under the earthquake effect are solved.

The present invention relates to a corrugated plate web girder. The structure of the corrugated plate web girder comprises an upper flange plate, a lower flange plate and a corrugated web. The corrugated plate web girder has the following characteristics: prestressed ribs, which are fixed on girder end plates by anchors, are arranged on the corrugated web; or reinforced rib plates with holes are arranged on both sides of the corrugated web; and the prestressed ribs pass through the reinforced rib plates and are fixed on the reinforced rib plates of both ends by the anchors. The corrugated plate web girder has the following advantages: the corrugated plate web girder adopts the prestressing technology, so the bearing capability of the girder structure is enhanced; the weight is light, so the corrugated plate web girder can be adapted to a large span; and the corrugated plate web girder has good designability and practicability.

The present invention relates in general to a method, apparatus, and article of manufacture for providing high-speed digital communications through a communications channel. In one aspect, the present invention employs variable delay FIR equalizer in the transmitter module to increase the system performance in channel communications.

A multiple speed power transmission is disclosed having an input, first and second input shafts, first and second clutches releasably coupling the input to the first and second input shafts, respectively, and a set of selectable power paths connecting the first and second input shafts to the output, the set of selectable power paths having at least one power path that includes both the first and second input shafts.

A linear motor is provided that includes a rod-like member having a cylindrical body made of a non-magnetic material and a plurality of plate-like segment magnets accommodated in the cylindrical body such that they are stacked in a longitudinal axial direction of the cylindrical body and a coil member having a polyphase coil. The rod-like member is arranged to extend through a center bore of the coil member. The rod-like member of the linear motor comprises the cylindrical body having a substantially oval or substantially rectangular section and the plurality of segment magnets having a substantially oval or substantially rectangular plate shape that are accommodated in the cylindrical body and stacked in the axial direction of the cylindrical body. The section of the center bore of the coil member is substantially oval or substantially rectangular corresponding to the shape of the section of the rod-like member.