45results about How to "Improve section stiffness" patented technology

The invention specifically relates to a reinforcing structure and method for assembled continuous box girders and solves the problem that the existing reinforcing of the assembled continuous box girders is high in disturbance degree to the original girders, low in construction efficiency and poor in overall rigidity. The reinforcing structure comprises two upper chords and a channel-steel-shaped lower chord and is characterized in that the channel-steel-shaped lower chord is provided with a plurality of anchor bolt holes, anchor bolts are arranged in the anchor bolt holes, web members are arranged between the outer sides of the two upper chords and the front and rear sides of the lower chord, a lacing bar is arranged between the middles of each pair of front-rear-corresponding web members,node plates are arranged between the lower ends of the web members and the front and rear walls of the lower chord, and lower reinforcing ribs are arranged in the channel-steel-shaped lower chord. The reinforcing structure has the advantages that the maximum vertical displacement of the upper box girders is reduced to a certain extent, overall section rigidity is increased to a certain extent, uniform stress of the transverse girders is achieved, the transverse partition girders can play the role of rigid support, the overall stress performance of the structure is increased, and the stress state of the single girder is improved evidently.

The invention relates to a hydraulic bulging tube with the partially thickened wall thickness and a forming method of the hydraulic bulging tube. The tube is characterized in that the wall thickness of the upper part or all R angle positions of the circumferential direction of the section of a hydraulic bulging tube body perpendicular to the axis and in the axial direction is larger than the wallthickness of the side wall of the tube body, or / and, the wall thickness of the tube body in the stress concentration position is increased, and the thickened wall thickness is continuous in the axialdirection of the tube body; and the wall thickness of the R angle position is 1.2t to 6.0t, wherein t is the wall thickness mm of the side wall of the tube body. Through the design of the hydraulic bulging tube with the partially thickened wall thickness, the rigidity of the section of a part can be improved, the stress concentration can be improved, and the thickness of a tube blank in the R angle and the corresponding stress concentration position is increased, and therefore, the phenomenon that the wall thickness is excessively thinned and crack occurs due to the fact that the local bulging amount is relatively large can be effectively avoided.

The invention discloses a wind power mixing tower barrel based on an edge stiffening combined shell, and relates to the technical field of wind power generation. The upper portion of the wind power mixing tower barrel is a pure steel tower barrel, and the lower portion of the wind power mixing tower barrel is a combined tower barrel. The combined tower barrel is formed by splicing two to eight edge stiffening combined shells along the circumferential direction, and is assembled along the vertical section. The edge stiffening combined shell is composed of hollow interlayer steel tube concrete and outer end plates, inner end plates and stiffening plates arranged along the periphery of the hollow interlayer steel tube concrete. The hollow interlayer steel tube concrete is composed of an outerlayer steel tube, an inner layer steel tube and concrete. Bolts, steel angles, T-shaped steel parts or a combination of the three steel parts are welded on one side of the steel pipe in advance, andthen concrete is poured. According to the wind power mixing tower barrel, the advantages of the combined structure are brought into full play, the stress form is reasonable, the connection is reliable, all the components can be prefabricated in advance and assemblied in filed, the construction efficiency is high, the material consumption is saved, the transport is convenient, and the engineering application prospect is wide.

The invention discloses a main chord pipe, a design method of the main chord pipe, a pile leg and a design method for an open-spandrel type main chord pipe by which a solid-web type main chord pipe can be replaced. The main chord pipe comprises a rack plate and semi-chord pipes connected with the rack plate. The rack plate comprises two or more racks and a connection assembly. Each rack comprisesa toothed plate and teeth. The side face, deviating from the teeth, of each toothed plate is the connection face. The connection assembly is connected between the two racks along the width direction of the racks. Thus waste of a tooth-shaped material excised can be effectively saved by the rack structure. In addition, the connection assembly is arranged and connected between the two racks so thatmeshing force coming from the teeth can be conducted, and section rigidity of the rack plate is improved. In this way, by means of the technical scheme of the main chord pipe, saving of materials is achieved, and meanwhile, structural strength of the main chord pipe is effectively guaranteed.

The invention relates to a triangular concrete thin-wall folded plate pile; end-to-end connection is conducted on a concrete left plate, a concrete middle plate and a concrete right plate so as to bend and form a triangular drum shape; the three angles of the triangular drum are respectively provided with a first bottom angle joint-pouring concrete zone, a second bottom angle joint-pouring concrete zone and a top angle joint-pouring concrete zone which cover part of steel bars of a steel bar mesh. A preparation method comprises the following steps: the concrete left plate, the concrete middleplate and the concrete right plate which are flatly horizontal are simultaneously poured and stretched to form a concrete flat plate of which three steel bar meshes are connected; the concrete left plate and the concrete right plate are symmetrically bent to form an angle; when the angle reaches 90 degrees, harsh concrete is adopted to cast the bottom angle joint-pouring concrete zones; the symmetrical bending is conducted continuously so as to lead the concrete left plate, the concrete middle plate and the concrete right plate to form a triangular drum shape; short connecting bars on the toppart are welded, the top angle joint-pouring concrete zones are cast, simultaneously adjustment and repairing are conducted on the bottom angle joint-pouring concrete zones, and when the joint-pouringconcrete reaches design strength, the triangular concrete thin-wall folded plate pile is formed.

The invention discloses a water-stopping type prefabricated assembly type foundation pit supporting construction mode. The mode comprises the following steps of carrying out integral construction budget, prefabricating supporting piles, mounting one-way grouting valve pipes, carrying out supporting pile construction, carrying out subsequent pile-among grouting water stop belt construction, carrying out cement soil stirring embedding fixing layer construction and the like. According to the mode, mortise groove structures are arranged on pile bodies of the supporting piles, a grouting space is formed between every two adjacent mortise grooves of the pile bodies, cement slurry or mixture of water glass and cement slurry are injected into grouting channels in foundation pit supporting engineering, the adjacent pile bodies can be stably connected, water stop belts can be prepared, and the tight connection between every two adjacent pile bodies can be ensured; and the prefabricated supporting piles are used as structural stiffeners and has the characteristics of high strength and high compactness, and meanwhile, the prefabricated supporting pile has the characteristics of large section rigidity, excellent bending resistance and no field maintenance. The construction installation of the prefabricated supporting piles adopts mechanical chemical methods such as a static pressure method,an impact method and the like, the construction speed is extremely rapid, and the construction period can be greatly saved.

The invention relates to a heavy-load large-span composite beam-column structure and a construction method. The structure comprises a stand column, a cantilever beam, an end plate and a large-span composite beam, wherein the stand column is a steel column or a steel-reinforced concrete column; the cantilever beam is made of H-shaped steel, one end of the cantilever beam is welded to the stand column, and a notch is formed in the upper side of the other end of the cantilever beam; the end plate is vertically arranged in the notch and is connected with a web and an upper flange of the H-shaped steel in a welded mode; and the large-span composite beam is connected with the cantilever beam in a bolted and welded combined mode and is composed of a circular steel pipe and T-shaped steel, the circular steel pipe is arranged above a web of the T-shaped steel and is welded to the web, the end face of the circular steel pipe is connected with the outer surface of the end plate in a welded mode, and the web and a lower flange of the T-shaped steel are connected with the web and the lower flange of the H-shaped steel through connecting plates and high-strength bolts. The large-span composite beam-column structure is particularly suitable for bearing roof heavy loads, and is high in rigidity, clear in load force transmission, low in mid-span deflection, high in bearing capacity and good in integrity. The structure is simple, the height and width of the section are small, and materials are saved.

The invention discloses a steel-encased-ultra-high performance concrete reinforcing method for a box girder. The method comprises the following steps of setting out the positions of bolts and embedded steel bars on the box girder, and drilling at the position of the box girder; mounting and maintaining the embedded steel bars, and embedding steel bar hooks along the longitudinal direction of the bridge; bottom plate stirrups and web stirrups being installed and bound with the embedded steel bars; the positions of the studs being lofted, and the studs being welded to the bottom steel plate and the side steel plates; the bottom steel plate and the side steel plates being fixed to the box girder through bolts, and the bottom steel plate and the side steel plates being welded through fillet welds; and ultra-high performance concrete being poured and cured. The method steel-encased ultra-high performance concrete of the box girder is reinforced, the steel plate-ultra-high performance concrete can effectively improve section rigidity of the original structure, the bearing capacity of the structure is greatly improved, the size of the reinforced section of the structure is small, and reinforcing efficiency is high. According to the steel-ultra-high performance concrete reinforcing design, common load-bearing steel bars and prestressed steel strands are not configured, and the site construction process is simple.

A type of steel concrete frame-steel support structure variable cross-section conversion node, which is connected and poured into one by the medium-shaped steel in the column, the medium-shaped steel in the beam, the steel support, the reinforced concrete in the column, and the reinforced concrete in the beam. The section steel and the beam medium-section steel flange plate are connected orthogonally, the web of the beam medium-section steel at the node junction is converted into a web with increased height and variable section, and the upper side of the web with increased height and variable section is welded to the upper flange with increased width and variable section, and the height and variable section The underside of the web plate is welded with the lower flange of the widened and variable section; the shape of the steel support at the junction of the nodes is converted into a structure in the transition zone of the variable section node, and the two flange plates of the steel support in the transition zone of the variable section are respectively connected with the steel in the column and the The beams are connected orthogonally in steel sections. The invention enhances the stress performance of the section steel concrete frame-steel support structure joint area and the synergistic effect ability of the section steel and reinforced concrete.

The invention provides a one-sided steel plate ultra-high-performance concrete single-layer containment vessel, which belongs to the technical field of nuclear power engineering structures. The containment structure includes the cylinder body and the dome, both of which adopt a single inner steel plate ultra-high performance concrete structure, and a plurality of T-shaped stiffeners, studs and shear bars arranged obliquely or orthogonally are evenly fixed on the outer surface of the steel plate by welding. The T-shaped stiffener web can be solid web or empty web, and the shear reinforcement is fixed by the two-way reinforcement intersection of the straight thread anchor plate on the top and the reinforcement mesh on the outside of the containment wall. The dome considers the design of Yonglin combined with reserved holes, and the cover plate and the opening are connected and disassembled by ring flanges and high-strength bolts. The containment adopts a modular design and construction method, and the single-sided steel plate and T-shaped stiffener can replace part of the ultra-high performance concrete pouring formwork. Adopting the invention can ensure the pressure bearing and sealing requirements in the containment vessel, prevent external events and large aircraft collisions, and has remarkable engineering economy.

The invention relates to an anti-shearing reinforcement device and method for a concrete box girder web. In order to solve the problem that in existing engineering technologies, the concrete box girder web has cracking inclined cracks and insufficient anti-shearing bearing capacity, an external vertical prestressing tendon reinforcement device and method are provided. The device comprises groove-shaped steel, L-shaped steel, vertical prestressing tendons, wedge-shaped steel cushion blocks and an anti-corrosion coating at the outer side of the web. The groove-shaped steel is horizontally fixedto the junction of the upper end of the web and a top plate in the girder length direction. The L-shaped steel (6) is horizontally fixed to the lower end of the web in the girder length direction andis parallel to the groove-shaped steel (5). The vertical prestressing tendons are vertically mounted on the groove-shaped steel and the L-shaped steel, and it is ensured that the vertical prestressingtendons are parallel to the plane of the web. According to the anti-shearing reinforcement device and method, the web is connected with the top plate and a bottom plate through finish rolling twistedsteel, the force transmission path is definite, the risk that web concrete is pulled broken is reduced, and meanwhile, midspan deformation is reduced; the problem of insufficient main tensile stressof the web concrete is effectively solved, and the situations of continuous extension of the inclined cracks of the web or new inclined cracks are prevented.

The invention discloses a steel plate holder and skew spike combined rapid connecting steel and UHPC (ultrahigh performance concrete) combination structure system, comprising a steel beam, an UHPC thin slab, steel plate holders and short spikes; the steel plate holders are of isosceles-trapezoid structure, and are connected with the steel beam through high-strength bolts; the short spikes are vertically arranged on bevels of two sides of each steel plate holder; the UHPC thin slab is cast on the upper side of the steel beam; combinations of the steel plate holders and the short spikes are uniformly distributed inside the UHPC thin slab. As the deck slab is made of UHPC, dead weight of the structure can be reduced while bridge capacity of the structure can be improved; steel plate holder and skew spike combined connectors are used for interface connection at the interface, so that comprehensive advantages of the steel plates serving as the rigid connectors and the spikes serving as theflexible connectors can be achieved well, and interface slippage can be reduced under action of rigid connection of the steel plate holders in the normal application state; in the UHPC slab, the shortskew spikes are in staggered arrangement to form the reinforcing truss of the UHPC, and accordingly rigidity of the UHPC slab is increased and the integral rigidity of the combination section is increased.

An automobile aluminum alloy floor beam connecting structure is provided with a first connecting piece and a second connecting piece. The first connecting piece is of a hollow cavity structure, is provided with an arc-shaped top face extending towards the front side and the rear side, is connected with the first cross beam in a spot welding mode through an arc-shaped top face front side extending part, a cavity front side wall and a cavity bottom face, and is connected with the end of the longitudinal beam in a spot welding mode through an arc-shaped top face rear side extending part and a cavity rear side wall. The second connecting piece is a T-shaped hollow shell, the upper end and the lower end of the second connecting piece are of an open structure, a longitudinal beam penetrating groove and a cross beam penetrating groove are formed in the side wall of the second connecting piece, the longitudinal beam penetrates through the longitudinal beam penetrating groove, the left side wall and the right side wall of the longitudinal beam are connected with the longitudinal inner wall of the T-shaped hollow shell in a spot welding mode, and the end of the second cross beam penetrates through the cross beam penetrating groove. The front side wall and the rear side wall of the second cross beam are in spot welding connection with the transverse inner wall of the T-shaped hollow shell. Reliable connection of parts in the aluminum alloy floor beam assembly is achieved, and the purposes of meeting the requirements of automobile floor beam connection strength, light weight and low cost are achieved.

The invention discloses a concrete shrinkage stress restraint system of a subway underground long longitudinal structure. Supporting transverse beams and side columns are arranged at certain intervalsadditionally in the longitudinal direction of the long longitudinal structure, the transverse beams are arranged on a top plate and a bottom plate respectively, the side columns are arranged on sidewalls on both sides, and the transverse beams are connected with the side columns end to end to form a closed frame. According to the system, through the arrangement that the beams, the columns and the closed frame are arranged on the long longitudinal structure additionally, and anti-cracking steel bars are arranged additionally at the same time, on the one hand, the cross-sectional area and reinforcement ratio of a beam-column structure are increased, the longitudinal rigidity and tensile stress of the structure are improved, on the other hand, the shrinkage stress accumulates at the late stage of truncated structure closing, and the shrinkage effect length is shortened, so as to avoid structural cracks of the long longitudinal structure caused by the shrinkage stress, the safety and durability of a main structure are ensured, safe operation is ensured, a lot of plugging and repair costs of concrete cracks are saved, and economic benefits are good.