A method for manufacturing a high-precision and ultra-long standard wire (8) of a main cable strand of a suspension bridge, the method comprising the manufacturing of a reference wire (7): converting mark requirements of a main cable strand into length marks on multiple reference wires (7); numbering a mark point corresponding to each segment mark length; and marking, in a projection manner, one reference wire (7) with all the mark points on the multiple reference wires (7). The method further comprises the manufacturing of a standard wire (8): on a pedestal, making the reference wire (7) and the standard wire (8) achieve the same stress state by means of weight loading; during marking, the position of the reference wire (7) remaining unchanged, the standard wire (8) and a main cable strand having an equal length, dividing the standard wire (8) into several segments, each of which have a length equal to that of the reference wire (7), sequentially marking the several segments of the standard wire (8) with reference to the serial numbers of the mark points on the reference wire (7), and moving to the next segment after a segment has been marked; and sequentially completing the manufacturing of the whole standard wire (8). The method eliminates a length error caused by the elastic modulus and diameter deviations of a reference wire (7) and a standard wire (8), thereby improving the length precision of the standard wire (8).
The present invention relates to a plug-in type reel frame structure for coiling main cable strands, and a disassembly, assembly and storage method, relating to the technical field of suspension bridge main cable strands. The plug-in type reel frame structure comprises a reel frame base, a reel frame cover is arranged above the reel frame base in parallel, a support rod unit which is obliquely arranged is arranged between the reel frame base and the reel frame cover, one end of the support rod unit is inserted into the reel frame base, and the other end of the support rod unit is inserted into the reel frame cover; the top of the reel frame cover is annularly provided with a plurality of coiling buckles which each are inserted into the reel frame cover; a notch is formed in the reel frame cover; and the reel frame base is provided with hanging point units. According to the present application, the stability of a support rod can be ensured, and the support rod can be quickly disassembled and assembled; after the cable strands are erected on a construction site, the cable strands can be classified and stacked and transported after being disassembled, which reduces an occupied area, and increases the transportation efficiency. Four groups of hanging point units are provided to reduce the bending moment at a lifting force bearing point, such that the reel frame base is not prone to deformation.
The present invention relates to a method for replacing a sling that is arranged between a main cable and a box girder, with both upper and lower ends of the sling being in pin-connection, and both anchor heads at the upper and lower ends of the sling being fork-shaped anchor heads. The tensioning of a temporary sling and the removal of the tensioning force of a replaced sling are synchronously and uniformly performed according to grades, with the tensioning force of the replaced sling being carried by the temporary sling until the tensioning force of the replaced sling reaches 0, the pin-connected structures at the upper and lower ends of the replaced sling are removed with the aid of a pushing device to dismantle the replaced sling, and after a new sling is mounted for replacement, the tensioning of the new sling and the removal of the temporary sling are synchronously and uniformly performed according to grades so that the new sling is stressed.
A fire-resistant structure of a durable super-large-span double-tower suspension bridge cable system, comprising a fire-resistant main cable (1) and fire-resistant slings (3). A plurality of cable clamps (2) are provided on the fire-resistant main cable (1) at intervals in a length direction; the fire-resistant slings (3) are provided between the plurality of cable clamps (2) and a steel box girder (5); sling anchorage devices (4) are respectively provided at the upper end and the lower end of each fire-resistant sling (3); the sling anchorage device (4) at the upper end is connected to a sling clamp (2), and the sling anchorage device (4) at the lower end is connected to the steel box girder (5); the fire-resistant main cable (1) comprises a main cable body (1.1); an S-shaped steel wire (1.2) is wound on the periphery of the main cable body (1.1); the periphery of the S-shaped steel wire (1.2) is wrapped with an anti-corrosion sheath (1.4); the periphery of the anti-corrosion sheath (1.4) is provided with a main cable outer layer fire-resistant sheath (1.3); each fire-resistant sling (3) comprises a steel wire bundle (3.1); a polyester fiber belt (3.2) is wound on the periphery of the steel wire bundle (3.1); and a high-density polyethylene layer and a sling fire-resistant sheath (3.4) are sequentially provided on the outer layer of the polyester fiber belt (3.2) from inside to outside. The fire-resistant structure of the durable super-large-span double-tower suspension bridge cable system ensures that the line type and the cable force of the main cable (1) and the slings (3) are not greatly changed in a fire, and ensures the overall safety of a cable system.
An apparatus and method for testing the salt spray corrosion resistance of a steel wire in a bent and tensioned state. The apparatus comprises a bottom plate (1), a top plate (2), stress loading bolts (3), an arc plate (4), anchorage devices (6), and stress sensors. The top plate (2) is disposed above the bottom plate (1) in parallel; the arc plate (4) is fixed on the top plate (2); a steel wire is bent along the arc surface of the arc plate (4); the two ends of the steel wire extend downward to pass through wire passing holes of the top plate (2) and the bottom plate (1), respectively; the two ends of the steel wire are then anchored at the bottom of the bottom plate (1) by means of the anchorage devices (6); the stress loading bolts (3) are each provided with a loading nut (7) and a self-locking nut (8), and support between the top plate (2) and the bottom plate (1) to load tension to the bent steel wire; the stress sensors are used for sensing loads applied to the steel wire. The load states of bent sections, at a cable saddle, of steel wires of a suspension bridge in an air-spinning method are simulated, and the present invention is used for evaluating the salt spray corrosion resistance of bent sections of steel wires at a cable saddle.
The invention belongs to the technical field of building materials, mainly relates to a high-strength carbon fiber composite bar with resin ribs on the surface, and a preparation method thereof. The invention comprises a carbon fiber and an epoxy resin matrix, wherein continuous spiral epoxy resin ribs are arranged on the surface of the bar, the thickness of the resin ribs is within 0.2 mm-0.4 mm, the width of the resin ribs is within 5 mm-7 mm, and the pitch of the resin rib is within 2 mm-4 mm. According to the present invention, during the forming process, the nylon belt winding of the present application does not squeeze the carbon fiber bundle, and due to tension of the carbon fiber bundle, the carbon fiber bundle remains straight along the lengthwise direction of the bar. Therefore, the bar manufactured by the method of the present invention has the characteristics of high strength and high modulus.
C08J 5/24 - Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
B29C 70/16 - Fibrous reinforcements only characterised by the structure of fibrous reinforcements using fibres of substantial or continuous length
B29C 70/34 - Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or coreShaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression
B29C 70/56 - Tensioning reinforcements before or during shaping
7.
MULTI-COMPONENT ALUMINUM ALLOY WELDING WIRE AND PREPARATION METHOD THEREFOR
A multi-component aluminum alloy welding wire. The aluminum alloy welding wire is formed by extruding and drawing two or more aluminum alloy wires, and the proportion of the aluminum alloy wires is calculated and prepared according to the required proportion of a finally formed aluminum alloy welding wire. The aluminum alloy wires are preferably a binary or ternary alloy. Also disclosed is a preparation method for the multi-component aluminum alloy welding wire: placing the aluminum alloy wires of different components into a bundle in parallel, and heating, extruding and drawing the aluminum alloy wires to a designated diameter. According to the welding wire and the preparation method therefor, components of the multi-component aluminum alloy wire can be adjusted according to requirements, the method is simple and reliable, a multi-variety small-batch production mode is facilitated, the aluminum alloy welding wire with different components can be produced at low costs, and the production is more flexible.
A stainless steel coated steel wire composite wire, comprising: (1) according to the requirements of a wire rod to be produced, selecting core material carbon steel and a stainless steel pipe that have an appropriate size, wherein the ratio of the radius of the carbon steel to the wall thickness of the stainless steel pipe is equal to 0.1-100; derusting and cleaning the surface of the carbon steel and the inner side of the stainless steel pipe; embedding the carbon steel into the stainless steel pipe, and welding and sealing both ends of the stainless steel pipe by means of vacuum welding technology; (2) heating the prepared blank to 900-1,300°C, and maintaining the temperature for 15 minutes or more; then, immediately rolling the blank into a wire rod having a diameter of 3-15 mm; and (3) performing austenization, brazing bath quenching heat treatment, and multi-pass drawing on the wire rod to prepare a stainless steel coated steel wire. The composite wire prepared by the method has better uniformity along a length direction, and the interface bonding between the core material and a stainless steel outer layer is more effective.
B21C 37/04 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided forManufacture of tubes of special shape of rods or wire
9.
METHOD FOR PREPARING MULTI-CORE CLUSTER OPTICAL FIBER CONNECTOR
A method for preparing a multi-core cluster optical fiber connector, comprising the following steps: step 1. arranging a plurality of metalized optical fibers to form an optical fiber bundle (1); step 2. cleaning; step 3. coating a wrapping metal paste on a front end of the optical fiber bundle (1); step 4. sleeving a first fixture (3) on the optical fiber bundle (1); step 5. inserting the optical fiber bundle (1) into a ferrule (2); step 6. sleeving a high-frequency coil (5) on the optical fiber bundle (1); step 7. sleeving a second fixture (4) on the optical fiber bundle (1); step 8. energizing the high-frequency coil (5) to heat the metal paste filled between the optical fiber bundle (1) and the ferrule (2), and volatilize an organic solvent therein, wherein the hot-melted metal achieves the metallized sealing of the optical fiber bundle (1) and the ferrule (2). The described method may effectively increase preparation efficiency for a multi-core cluster optical fiber connector and the connection strength of a prepared product.
Disclosed are a high-strength carbon fiber composite bar material with a resin rib on the surface and a preparation method therefor, relating to the technical field of building materials. The carbon fiber composite bar material comprises carbon fibers and an epoxy resin matrix. There is a continuous helical epoxy resin rib on the surface of the bar material, wherein the thickness of the resin rib is in a range of 0.2 mm-0.4 mm, the width of the resin rib is in a range of 5 mm-7 mm, and the screw pitch of the resin rib is in a range of 2 mm-4 mm. In a molding process, a nylon tape is wound without extruding a carbon fiber bundle, and the carbon fiber bundle can keep flat and straight along the length direction of the bar material under the tension of the carbon fiber bundle, such that the bar material made by the method has the characteristics of high strength and high modulus.
A steel wire rope for an air-impermeable rubber belt, comprising a core strand (1) and several outer strands (2), the several outer strands (2) wrapping around the outside of the core strand (1); the core strand (1) is a linear strand; the core strand (1) is either a cross lay strand or a parallel lay strand; the outer strands (2) each consists of an outer strand core yarn (2.1), an outer strand intermediate yarn layer (2.2) and an outer strand outer yarn layer (2.3), which are arranged from inside to outside; the outer strand outer yarn layer (2.3) consists of outer strand outer yarn layer heavy wires (2.3.1) and outer strand outer yarn layer small-gauge wires (2.3.2), the outer strand outer yarn layer heavy wires (2.3.1) and the outer strand outer yarn layer small-gauge wires (2.3.2) being arranged alternately so as to wrap around the outer side of the outer strand intermediate yarn layer (2.2); and the outer strand outer yarn layer heavy wires (2.3.1) and/or each steel wire of the outer strand intermediate yarn layer (2.2) are bent steel wires having a wavy shape in a plane. The steel wire rope has the advantage of achieving sufficient combination of the rubber belt steel wire rope and rubber, thereby guaranteeing the air impermeableness of the rubber belt.
JIANGSU FASTEN TECHNOLOGY DEVELOPMENT CENTER CO., LTD. (China)
Inventor
Liu, Lihua
Zhang, Chunlei
Liu, Hongfang
Lu, Yi
Zhao, Guorui
Abstract
A filled-type linear contact structure steel wire rope and a manufacturing method therefor. The steel wire rope comprises a core, strands, and filler wires or filler strands or partially filler wires and partially filler strands, the core and the strands being point contact or linear contact strands, the strands and the filler wires or filler strands or partially filler wires and partially filler strands being formed and twisted on the core in one step, gaps between the core and the strands being filled with the filler wires or filler strands or partially filler wires and partially filler strands having a certain steel wire tensile strength, the strands and the filler wires or filler strands or partially filler wires and partially filler strands being synchronously led to a closure point during rope twisting, forming the product in one step. The filler wires or the filler strands are used to increase the density coefficient of the steel wire rope. Given the same steel wire tensile strength, the new structure increases the filled area by 3-5% in a product having an equivalent diameter design, and correspondingly increases the breaking force by 3-5%.
D07B 1/10 - Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core the layers of which are formed of profiled interlocking wires, i.e. the strands forming concentric layers with a core of wires arranged parallel to the centre line
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