629results about How to "Reduce section size" patented technology

The invention discloses a prestressed concrete constraining buckling-restrained brace. The brace comprises a cross inner core member, concrete-filled square steel tube constraining members, a hard rubber plate, long bolt shank positioning parts and prestressed tendons, wherein four concrete-filled square steel tube constraining members are made of prestressed thin-wall steel tube concrete and attached to the cross inner core member closely to form a stressed whole; the cross inner core member is made of two pieces of low-intensity high-stretchability hot rolled section steel with a T-shaped cross section, and an inner surface and an outer surface are attached to the hard rubber plate; and a circular hole is arranged in the middle of the buckling-restrained brace, and the long bolt shank positioning parts penetrate through the circular hole and connect the cross inner core member, concrete-filled square steel tube constraining members and the hard rubber plate. The prestressed concrete constraining buckling-restrained brace has the advantages that the constraining effects of concrete can be implemented fully, the cross section size of the member is reduced, high efficiency and economy are achieved.

The invention provides a high-strength reinforcement built-in ultra high performance concrete (UHPC) beam member, which is particularly suitable for the field of beam members with high-rise, heavy load and long span structures. The member comprises UHPC and a reinforcement cage which is poured inside and is formed by high-strength reinforcement and common reinforcement. The beam member has the following advantages: the advantages of the UHPC and the high-strength reinforcement are fully utilized, thus effectively reducing the section of the member, improving the ductility of the member and enlarging the available space while saving materials and energy; and the beam member dispenses with application of prestress, has simple construction process, is suitable for prefabrication production, improves the construction speed and is beneficial to popularization and application of the two materials in the engineering and research and development of novel materials.

The invention discloses a novel reinforcement method for a two-way curved arch bridge comprising the following steps: (1) closing to traffic on a bridge deck, dismantling the bridge deck and auxiliary facilities of the bridge deck and removing fillings on arches; (2) cutting rectangular grooves along the two-way curved arch bridge on the top of an extrados corresponding to an original arch rib; (3) chipping the bottom of the rectangular grooves, planting anti-shear reinforcement bars, erecting a formwork on the extrados on the top of the rectangular grooves, assembling the anti-shear reinforcement bars and pouring concrete to form new arch ribs, of which the height is same relative to the extrados, protruding from the extrados; (4) repairing transverse walls, chipping the sections, which are at the outer side of the transverse walls along the two-way curved arch bridge, of the extrados and the new arch ribs, planting reinforcement bars on the extrados and the new arch ribs which are chipped, erecting the formwork and pouring the concrete; (5) chipping the top of the transverse walls, planting vertical reinforcement bars and erecting new columns for supporting the bridge deck; (6) newly building the bridge deck. The novel reinforcement method for the two-way curved arch bridge has the advantages of being small in dead weight of a bridge structure, good in unity of an old structure and a new structure, low in reinforcement cost, good in adaptability, not restricted by surroundings under the two-way curved arch bridge, unchanged about the original appearance of the two-way curved arch bridge, good in operability and good in application prospect.

A canned linear motor armature and a canned linear motor of water cooling type are provided. The insulation reliability of a canned linear motor armature is improved. The temperature rises of both the linear motor surface and the armature winding are reduced. Even if the coolant pressure increases, the can neither breaks nor deforms. The weight of the armature is lightened. The viscosity braking force is reduced. In the canned linear motor armature, the armature winding (104) is surrounded with a picture-frame-shaped case (111), both the openings of the case (111) are closed with flat can (121), and coolant passages (131) are provided inside the can (121) and on the top surface of the coil side of the armature winding (104).

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 invention involves a section steel concrete column with special lateral section and methods and belonging to the field of special-shaped columns. The shape of the cross-section of special-shaped column is the cross-section which combined by circular and rectangular or two or more rectangular. The framework of steel reinforcement with the cross-section of circular or rectangular comprises of vertical bars (2) and stirrup (3) together, the section steel (1) is installed in the framework of steel reinforcement, the section steel (1) is continuous forming a unit in the special-shaped column which comprise of section steel knitting (4) and section steel flange (5), reinforced bar sections (6) or rivets are welded on the outside of the section steel flange (5). The invention improves the ductility and the forced ability of the prior reinforced concrete special-shaped column, increases the bearing ability.

The invention provides a method for reinforcing a concrete column by utilizing a PVC-FRP (Poly Vinyl Chloride-Fiberglass Reinforced Plastic) pipe and belongs to the technical field of civil engineering. The method is suitable for maintaining and reinforcing the concrete columns in civil buildings, industrial plants and bridge structures. By mainly aiming at the reinforced concrete column, a PVC pipe is sheathed outside the concrete column, a reinforcing steel bar is configured in the PVC pipe, FRP cloth is wound outside the PVC pipe to form restraint action on the concrete column with the PVCpipe, and the internal pressure of the PVC pipe sheathed outside should reach above 1Mpa. The FRP cloth can adopt a carbon fiber composite material, a glass fiber composite material or an aramid fiber composite material. Compared with the traditional reinforcing method, the method for reinforcing the concrete column by utilizing the PVC-FRP pipe has the advantages that the reinforced concrete column is high in bearing capacity, small in cross section size and good in ductility and durability; and the method is convenient to construct, low in construction price and the like.

The invention provides a tower crane. The tower crane comprises a climbing frame and jacking system (100), wherein the climbing frame and jacking system (100) comprises a climbing frame (110) and a jacking system for jacking the climbing frame (110); the jacking system comprises an upper cross beam (140) connected with the climbing frame (110), a jacking cross beam (130) supported on a standard section (2) and a hydraulic system; the hydraulic system comprises a plurality of jacking oil cylinders (120) supported between the upper cross beam (140) and the jacking cross beam (130); the jacking oil cylinders (120) are arranged on the side face, which is positioned on the balance arm side, of the climbing frame (110) and two side faces, which are adjacent to the first side face, of the climbing frame (110) respectively; and more than two jacking oil cylinders (120) are arranged on at least one of the three side faces. According to the tower crane, an upward rotary self-lifting structure is adopted in a super-huge type tower crane, so that the maximum lifting height of the super-huge type tower crane is increased.

The invention relates to a concrete-filled steel tube combined shear wall and a construction process thereof. The shear wall comprises steel tubes which are distributed uniformly along the section of the shear wall, concrete filled into the steel tubes, concrete poured outside the steel tubes, square stirrups arranged outside the steel tubes, and vertically-distributed steel bars and horizontally-distributed steel bars which are arranged on front and rear sides of the steel tubes, tie steel bars which are tied between the steel tubes and the vertically-distributed steel bars and between the steel tubes and the horizontally-distributed steel bars, and longitudinal steel bars which are arranged at the positions of restraint members on edges of two sides of the steel bars. According to the concrete-filled steel tube combined shear wall, the steel tubes are embedded into the ordinary reinforced concrete shear wall, and the bearing capacity of the concrete is improved under the restraint action of the steel tubes, so that the sectional dimensions of the members are reduced, the dead weight of a structure is reduced, a seismic effect is reduced, and more usable areas are provided for buildings under the condition of the same design axial force; and anti-seismic properties of the flexural capacity, shear capacity, damage ductility and the like of the shear force are improved effectively by utilizing the high bearing capacity and high ductility of the concrete-filled steel tubes.

An apparatus for underpinning reinforced concrete columns by adopting prestress technology improves underpinning bearing capacity by enhancing new and old concrete interface pressure. A reinforced concrete column clasping beam (6) is constructed around an underpinned reinforced concrete column (1), and a first direction restraint steel plate (2) and a second direction restraint steel plate (3) are installed respectively all around the external of the reinforced concrete column clasping beam (6) for enclosure protection of the beam. A prestressed bar (4) traverses reserved round holes reserved on the first direction restraint steel plate (2) and the second direction restraint steel plate (3) and applies prestress by stretching a prestressed reinforcing bar (4) and two ends of the prestressed bar are fixed by an anchor (5). The apparatus in the invention uses principle that performance of concrete is improved in the three-direction restraint condition and that friction increases with increasing interface pressure and more efficiently uses performance of material. Underpinning and loading have wide applicability.

The invention relates to a precast steel pipe concrete laminated column comprising a foundation and a plurality of steel pipe concrete segments. The steel pipe concrete segments comprise the bottom segment, the top segment and one or more intermediate segments. Each steel pipe concrete segment comprises a lower steel plate, a steel pipe concrete main body and an upper steel plate which are fixedly connected in sequence. The bottom segment and the corresponding intermediate segment are fixedly connected through connecting anchor bolts, and the corresponding intermediate segment and the top segment are fixedly connected through connecting anchor bolts. Bottom anchor bolts are arranged on the upper surface of the foundation. The bottom segment is fixed to the foundation by means of connection of the lower steel plate of the bottom segment and the bottom anchor bolt. The precast steel pipe concrete laminated column has the characteristics of high bearing capacity, good anti-seismic performance and excellent durability and can be precast and manufactured in a factory or a different place in advance, the defect of complex procedures of traditional cast-in-situ concrete construction is avoided, and the precast steel pipe concrete laminated column has the advantages that the construction speed is high, the influence on the environment is small, the construction period is short, construction noise is low, material stacking sites are few, and environmental protection is facilitated.

The invention provides a double-steel-sheet and concrete combined core-tube structure with built-in corrugated steel sheets. The corrugated steel sheet and a plurality of steel cover plates are vertically welded and connected to form an elongated grille steel tube wall board by borrowing ideas from a steel tube and concrete combined structure, high-strength concrete is poured into grille steel tubes to form an elongated grille steel tube and concrete combined shear wall board, and the elongated grille steel tube wall board and in-tube concrete columns are used in a combined mode, complement each other's advantages and work cooperatively. The novel shear wall board is in welding connection with edge steel columns and edge steel beams, and an end portion steel tube concrete core column is arranged at the intersecting corner position of wall bodies of core-tube shear walls to form the novel double-steel-sheet and concrete combined core-tube structure with the built-in corrugated steel sheets. A steel frame-structural system of the novel combined structure core tubes has the advantages of being large in structural rigidity, high in compression bearing capacity, convenient to construct, strong in anti-bending capacity, high in yield load, good in anti-seismic ductility, good in energy dissipation capacity and the like, and the double-steel-sheet and concrete combined core-tube structure can be used for a 60-storey steel structure building and a super high-rise steel structure building with more than 60 storeys.

The invention relates to the technical field of geotechnical engineering disaster prevention and control, in particular to a vertical pre-stress anchor rod gravity-type composite retaining wall which comprises a mortar building block stone wall arranged on a bed rock layer. Anchor holes are formed in the mortar building block stone wall and the bed rock layer in the vertical direction. An anchor rod is arranged inside each anchor hole. Cement mortar is filled between the anchor rod and the anchor holes. A concrete anchor beam is arranged at the top end of each anchor hole. The concrete anchor beams are arranged at the upper end of the mortar building block stone wall. A concrete anchor head is arranged on each concrete anchor beam. Compared with a traditional gravity-type retaining wall, the vertical pre-stress anchor rod gravity-type composite retaining wall has the advantages that elastic retraction of the anchor rods is utilized for applying pre-stressing force on the wall body, the weight of retaining wall masonry can be replaced, the sectional size of the retaining wall is reduced, and the integrality and the shearing strength of the wall body of the retaining wall are strengthened.

The invention provides a circular pipe type inner suspended holding pole, and belongs to a holding pole used for group erecting of a transmission tower. The holding pole is formed by connecting a suspended base, a lower segment, a straight line segment, an upper segment and a knuckle arm component in sequence by bolts, wherein the straight line segment is formed by connecting a plurality of standard segments in sequence by bolts; and the straight line segment, the upper segment and the lower segment are formed by welding circular pipes. The holding pole has the advantages of light weight, good mechanical property and convenient assembly and disassembly.

The invention relates to a satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array, which can radiate microwave signals to the space, and can receive microwave signals from the space. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is composed of a plurality of antenna units, wherein each antenna unit comprises a matching diaphragm, an SMP coaxial feed socket, a square waveguide radiator, a waveguide-to-coaxial adapter, an SMP feed socket feed end, an impedance matching device and a circular polarizer, and adopts an integral design; and the matching diaphragms are adopted among the antenna units for deploying coupling characteristics among radiating units, so as to achieve more ideal standing wave performance and radiation characteristics. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is simple and reliable in structure, has the advantages of two-directional plus/minus 40-degree wide angle scanning, low sweep gain drop and excellent circular polarization characteristics, and satisfies the requirements for an phased-array antenna of satellite-borne intersatellite and satellite-to-ground communication. The antenna adopts an aluminum structure, and performances of the antenna are not affected by factors such as elemental oxygen corrosion and ultraviolet radiation of the on-orbit space environment.

The invention discloses a device for preventing wall out-of-plane unstability from causing collapse of a building of a masonry structure in an earthquake. The device comprises a steel wire gauze, vertical steel pipes, horizontal steel pipes, anchoring steel bars and structural adhesives, wherein the vertical steel pipes and the horizontal steel pipes are tightly attached to the wall surface of the building of the masonry structure; the vertical steel pipes are connected with a building panel, a floor panel and a foundation beam of the building of the masonry structure through the anchoring steel bars; the horizontal steel pipes are connected with the vertical steel pipes in a welding mode. The vertical steel pipes and the horizontal steel pipes form a rectangular area in a defined mode. In the rectangular area, the steel wire gauze is laid with the vertical steel pipes and the horizontal steel pipes as the edges, the steel wire gauze, the vertical steel pipes and the horizontal steel pipes are connected through welding seams, and the steel wire gauze and the wall surface of the building of the masonry structure are bound through the structural adhesives. The device can be arranged on one face of the building wall of the masonry structure, and can also be arranged on two faces. By the adoption of the device, when the building of the masonry structure is in an earthquake, the out-of-plane deformation of the wall body is limited by the device, and the wall out-of-plane unstability can be prevented from causing collapse of the building of the masonry structure in the earthquake.