CN2052015U - Cable for prestressed concrete - Google Patents

Abstract

The utility model relates to a reinforcing steel wire for prestressed concrete components in civil and industrial buildings. The reinforcing prestressed concrete components has two forms. One of the reinforcing prestressed concrete components adopts bright steel wires. The steel wires can not satisfy the requirement that civil buildings are developed with the trend of novel structure and large open space, and the steel wires have the disadvantages of poor bonding capability and complicated operation. For overcoming the disadvantages, the utility model provides a steel wire twisted by two (1*2) or three (1*3) steel wires with circular cross sections. The steel wires used for twisting the steel wire of the utility model have the diameters of 3.0-4.0 mm, 4.0-5.0 mm and 5.0-7.0 mm, and the proper strength of the steel wires is 118 c-167 CN / mm.

Description

Cable for prestressed concrete

The utility model relates to a kind of civilian.With make prestress concrete member goods arrangement of reinforcement steel strand in the industrial construction.

Prestress concrete member goods arrangement of reinforcement has two kinds: a kind of is to adopt cold-drawn low-carbon (LC) bright steel wire or middle intensity to give the stress bright steel wire.Along with civilian construction to novel structure, big

Between direction develop, and prestress concrete member goods arrangement of reinforcement does not satisfy requirement with steel wire.It exists holds

Shortcomings such as power difference and constructing operation complexity.7 (1 * 7-φ 15MM) circular cross-section steel wires of another kind of employing are twisted into the arrangement of reinforcement of steel strand as prestress concrete member goods.Its intensity rank is 1470-1770N/mm ²In civilian and other building such as industry and railroad sleeper, use the requirement of strength of arrangement of reinforcement at 1274-1372N/mm to prestress concrete member goods ²Get final product.If adopt 1 * 7-φ, 15 steel strand just very uneconomical with arrangement of reinforcement as prestress concrete member goods.Having listed two (1 * 2) circular cross-section diameters of a kind of usefulness in steel strand product standard (JISA3537-80) at Japanese prestress concrete is that 2.9 millimeters steel wire is twisted into steel strand, but this product strength is not suitable for general civilian again and the part industrial construction is used.

The utility model provides a kind of steel strand of using as prestress concrete member goods for overcoming above-mentioned various symptims and signs of deficiency part.

The purpose of this utility model can reach by following measure.Adopt the steel wire of two (1 * 2) or three (1 * 3) circular cross-sections to be twisted into steel strand.The steel wire diameter of twisting steel strand is respectively 3.0-4.0,4.0-5.0,5.0-7.0 millimeter.The lay pitch of steel strand is 12-16 a times of steel strand nominal diameter.The sth. made by twisting of steel strand is to being a left side (S) sth. made by twisting.The nominal diameter of steel strand, allowable variation, sectional area are distinguished as shown in table 1.The finished product of steel strand is a plate-like, and the dish internal diameter should be a 1-2 rice according to manufacturer's actual conditions and the general selective pan internal diameter of customer requirements greater than one meter.Every dish steel strand should be formed by one, and its length is generally selected 200-300 rice greater than 200 meters according to manufacturer's actual conditions and customer requirements.Must not there be any type of electric connection in every dish steel strand.

Below the utility model is described in further detail.Accompanying drawing 1 is the steel strand sectional views.(A) be the sectional view that two (1 * 2) circular cross-section steel wires are twisted into steel strand.(B) be the sectional view that three (1 * 3) circular cross-section steel wires are twisted into steel strand.D is the nominal diameter of steel strand.D is the nominal diameter of steel wire.Remaining technical requirements of circular cross-section steel wire that the twisting steel strand are used should meet the regulation of cold drawn steel wire among the GB5223-85 " prestress concrete steel wire ".That is: make steel wire and should meet the regulation of GB699-87 " carbon constructional quality steel number and general technology condition " with the chemical analysis of steel, its trade mark is definite according to steel wire diameter and mechanical property by the supplier.The utility model is selected 7C-8C# steel, carbon constructional quality steel for use.The size of its steel wire, profile and sectional area are as shown in table 2.Make wire rod and should meet GB43543-84 " regulation of Fine Steel Casting iron wire rod ".Wire rod needs the cold drawn again steel wire of being processed into after sorbitizing is handled.Must not there be electric connection in the finished product steel wire, and the joints made by electric welding that welds in order to work continuously when producing should cut away.Mechanical Properties of Steel Wire is as shown in table 3.With twisting with the fingers the drum machine steel wire is twisted into steel strand, and the heat treatment that steel strand are eliminated stress.Also should carry out stabilization processes in order to guarantee the performance that steel strand reach underrelaxation.The mechanical property of steel strand is as shown in table 4.The finished product of steel strand is a plate-like, and the dish internal diameter is 1-2 rice greater than 1 meter according to manufacturer's actual conditions and user's needs selection disk track.Every dish steel strand should be made up of long steel strand more than 200 meters, select the long 200-300 rice of every dish steel strand according to manufacturer's actual conditions and user's needs.Must not there be any type of electric connection in every dish steel strand.

The utility model and bright steel wire are made prestress concrete member goods arrangement of reinforcement and are compared and have the following advantages the bond stress that has 1. increased between arrangement of reinforcement and the concrete. 2. improved the quality of prestress concrete member goods. 3. reduce on-site construction processes, reduced labour intensity, improved productivity ratio.

The nominal diameter of steel strand wires and permissible variation table one

Claims (2)

1, a kind of steel strand that prestress concrete member goods arrangement of reinforcement uses of doing that are twisted into by the circular cross-section steel wire is characterized in that it is twisted into steel strand by two (1 * 2) or three (1 * 3) circular cross-section steel wires; The steel wire diameter of twisting steel strand is respectively 3.0-4.0,4.0-5.0,5.0-7.0 millimeter; The lay pitch of steel strand is 12-16 a times of steel strand nominal diameter; The sth. made by twisting of steel strand is to being a left side (S) sth. made by twisting; The nominal diameter of steel strand is respectively 6-8,8-10,10-14 millimeter (1 * 2), or be respectively 6.45-8.60,8.60-10.75,10.75-15.05 millimeter (1 * 3), its diameter allowable variation is respectively+C.4～-0.20, and+0.45～-0.20 ,+0.45～-0.20 millimeter.

2, steel strand as claimed in claim 1 is characterized in that the finished product of steel strand is a plate-like, and the dish internal diameter is a 1-2 rice, and every dish is made up of long 200-300 rice steel strand.