CN2136729Y

CN2136729Y - Special-shaped steel wire for prestressed concrete pipe stake

Info

Publication number: CN2136729Y
Application number: CN 92223504
Authority: CN
Inventors: 邹春明; 吴汝霖; 王景训; 张秀凤; 崔宝华; 张曦; 王宇
Original assignee: TIANJIN NO 1 PRESTRSED STEEL WIRE FACTORY
Current assignee: TIANJIN NO 1 PRESTRSED STEEL WIRE FACTORY
Priority date: 1992-05-28
Filing date: 1992-05-28
Publication date: 1993-06-23
Anticipated expiration: 2002-05-28

Abstract

The utility model relates to a special-shaped steel wire for prestressed concrete pipe stake. The steel wire of the existing pipe stake adopts a screw-thread steel which has the shortcomings of bad bond strength and the easy generation of transverse crack. The utility model designs a groove which is carved out of torsion-shaped on the surface, the section of the groove is in the shape of a trapezoid, and 3-6 steel wires whose grooves are parallel are used as the pipe stake. Groove depth is 0.30-0.40 mm, groove width is 1.50-2.30 mm, and the proportion of the groove of an upper opening and a lower opening is 4-1.2.

Description

Special-shaped steel wire for prestressed concrete pipe stake

The utility model relates to a kind of compressor wire that pile tube is used of making.

The tubular pile steel silk, the past is to use spiral always, because the lip-deep protrusion line of spiral is narrow and shallow, and the bond stress between the concrete is poor, particularly works as pile tube and is used for the soft areas of some geology such as seashore, sandy beach, when being subjected to external force, during the power that particularly is hit, transverse fissure often appears.Be to come off between reinforcing bar and the concrete.

Above-mentioned to exist bond stress with spiral as steel wire in the pile tube poor in order to overcome for the utility model, easily produces the shortcoming of transverse fissure, provides steel wire that a kind of outer surface is carved with the screw twisted dovetail groove as the pile tube compressor wire.

The steel wire of the utility model design is main to be characterised in that on the bright steel wire surface with special equipment and to be carved with serpentine torsion, its cross section is trapezoidal groove, groove vertical depth h=0.30-0.40 millimeter, groove wide a=1.5-2.3 millimeter suitable for reading, the ratio a/b=4-1.2 of groove upper and lower opening.And Steel Wire Surface form the 3-6 bar parallel reverse groove.The distance of reversing groove is 10-25 a times of steel wire nominal diameter.The nominal diameter of above-mentioned steel wire is the 7.4-13.0 millimeter.Material is for containing si, Mn, category-B low-alloy steel.As the 27Si2MnB steel.

Below in conjunction with description of drawings:

Accompanying drawing 1 is to have 3 structure of steel wire schematic diagrames that reverse groove.

Fig. 2 is Fig. 1 sectional view.

Fig. 3 has 6 section of steel wire figure that reverse groove.In the accompanying drawings, h is a groove depth, and a is that groove is suitable for reading wide, b is that the groove end opening is wide, d is the steel wire nominal diameter, and it is relevant to reverse factors such as groove bar number, groove depth on the dovetail groove nominal diameter, Steel Wire Surface with wide ratio a/b of end opening and steel wire suitable for reading, generally gets a/b=4-1.2.Its nominal diameter of steel wire of the utility model design is divided into 7.4,8.0,9.2,11.0,12.0,13.0,6 class.Its diameter permissible variation of steel wire of different nominal diameters, and the size of reversing groove and pitch thereon is shown in subordinate list 1.When same nominal diameter steel wire had different bar groove thereon, the groove depth groove width was as shown in table 2.

The steel grade that the manufacturing steel wire is used is determined according to the mechanical property and the instructions for use of reinforcing bar.It is raw material that the utility model can adopt the low-alloy steel that contains Si, Mn series.When producing, adopt the size that less compression ratio is drawn to be needed earlier, carry out the modification drawing again, promptly carry out drawing with mould with internal projection, Steel Wire Surface is formed reverse the shape dovetail groove, the torsional direction of groove can be that revolve on a left side (S) or right (Z) revolves.And then through the aligning tempering heat treatment.Product is 2.2 meters dish circle state delivery with internal diameter, and the finished product Mechanical Properties of Steel Wire is as shown in table 3.

Its performance of steel wire of the utility model design has all satisfied the requirement to steel wire in it of the pile tube that is used for seashore, sandy beach.The joint welding performance was good when its maximum characteristics were application, and swaging does not split, the bond stress height that combines with concrete, and it is new and effective economic steel.

Claims

1, a kind of prestressed concrete pipe pile profile wire is characterized in that being carved with on the Steel Wire Surface serpentine torsion dovetail groove, groove vertical depth h=0.30-0.40mm groove wide a=1.5-2.3mm suitable for reading, the ratio a/b=4-1.2 of groove upper and lower opening; And reverse dovetail groove at the parallel 3-6 bar of Steel Wire Surface, its pitch is 10-25 times of steel wire nominal diameter.

2, steel wire according to claim 1 is characterized in that the steel wire nominal diameter is the 7.4-13.0 millimeter.

3, steel wire according to claim 1 is characterized in that adopting the 27Si2MnB steel.