CN2499468Y

CN2499468Y - 1X3 structural model drawing steel twisted wire for prestress concrete

Info

Publication number: CN2499468Y
Application number: CN 01268161
Authority: CN
Inventors: 王康力
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-25
Filing date: 2001-10-25
Publication date: 2002-07-10
Anticipated expiration: 2011-10-25

Abstract

The utility model relates to a 1*3 structural model drawing steel twisted wire for prestress concrete. The utility model is characterized in that: the 1*3 structural model drawing steel twisted wire for prestress concrete consists of three steel wires; the sections of the three steel wires are in unusual shapes; and the steel wires are laid with each other and form a steel twisted wire with spiral flute. The utility model has the advantages that: first, the structure is compact and the tensile strength is high; second, the range of size tolerance can be controlled between +0.2 and -004, thereby the precision of the steel twisted wire and the budgetary accuracy are improved, and unnecessary waste is reduced; third, the outer contact surfaces of the steel twisted wire are three faces, thereby the contact area of a clamping piece for anchoring device and the steel twisted wire is increased, and the anchoring device is made to be more firm; fourth, the loosening level is improved from common loosening to low loosening, thereby not only steels are saved but also the construction period is shortened during the process of concrete construction; fifth, the manufacturing cost is lowered and the socioeconomic performance is improved.

Description

1 * 3 structure die drawing steel strand for prestressed concrete

One, affiliated field:

The utility model belongs to a kind of steel strand for prestressed concrete, particularly a kind of 1 * 3 structure die drawing steel strand for prestressed concrete.

Two, background technology:

At present existing 1 * 3 structural iron twisted wire for prestressed concrete of China is to be formed by high strength round wire twisting, and there is following defective in it; 1, loosely organized, tensile strength is low.The tensile strength of original steel strand is that example only is 1720N/mm with 10.8mm ²2, the dimensional tolerance range of original steel strand is difficult to control accurately.Its margin of tolerance is+0.3/-0.15, so the accuracy of steel strand is lower.3, less with the ground tackle contact area: be pulled to about 70% of tensile strength because use steel strand to rise in prestressed concrete, rising needs fix with ground tackle after drawing, and its tension is very big.Existing 1 * 3 steel strand product is that three round wires are formed, and the outer contacting face is three points.Cause anchoring not firm easily.4, stretching property and lax rank are lower.Former 1 * 3 steel strand are because its product is lax for the I level, and its lax value is 8% under 1000 hours initial load 70% situations.Therefore its stretching property is bad, and lax value is low, has brought inconvenience to use.

Three, summary of the invention:

The purpose of this utility model just is to overcome above-mentioned the deficiencies in the prior art, and provides a kind of compact conformation, tensile strength height, lax value low, and big 1 * 3 structure die drawing steel strand for prestressed concrete of ground tackle contact area.

As above design, the technical solution of the utility model is:

A kind of 1 * 3 structure die drawing steel strand for prestressed concrete is characterized in that: by three cross sections is that special-shaped steel wire is formed; Form after these steel wires are twisted together mutually and have the spiral fluted steel strand.

The cross section was the star symmetry after above-mentioned deformed wire was twisted together mutually, and formed helicla flute between each projection.

The cross section of above-mentioned every deformed wire is a drops, and the line of its top bump is the circumscribed circle of steel strand.

Superiority of the present utility model is: 1, compact conformation, tensile strength height.More (profile cross-section that is slightly larger than this invention 7.0mm size as the sectional area of former steel strand 8.6mm size is long-pending near real size for the nominal size of this invention.Like this, reduce steel strand shared volume in concrete, helped concrete intensity.The tensile strength of this invention 9.5mm die drawing steel strand can reach 1860N/mm ², the tensile strength of 7.0mm is 1670-1770N/mm ²Thereby, help saving rolled steel dosage, improve the supporting capacity of prestressed concrete.2, dimensional tolerance range can be controlled in+0.2/-0.04.Thereby improved the accuracy of steel strand and the accuracy of budget, reduced unnecessary waste.3, the outer contacting face of this invention is three faces, thereby the contact area that increases anchor clipper and steel strand makes anchoring more firm.4, improved lax rank, with the common lax underrelaxation that becomes.Relaxing to the II level is lax of this invention, its lax value is 2.5% under 1000 hours initial load 70% situations.Thereby make it in concrete construction, not only save steel but also saved construction period.5, reduced cost of production, improved economic results in society.Because the 7.0mm1 * 3 structure die drawing steel strands in this invention can substitute 7.0 helix rib steel wires fully, and the raw material of this product is than low 500 yuan/ton of the raw material of producing the 7.0mm helix rib steel wire.And other cost of production is very nearly the same with it.And sectional area reduces more than 10%.Therefore economic benefit is well imagined.If the 9.53mm1 * 7 structural iron twisted wires that substitute in the ASTM416-80 Unite States Standard with 9.5mm1 * 3 structure die drawing steel strands have small investment of production equipment again, on reducing, cost of production has very big advantage.

Four, description of drawings:

Fig. 1 is a schematic diagram of the present utility model

Fig. 2 is the sectional view of Fig. 1

Table 1 is 1 * 3 structure die drawing steel strand for prestressed concrete and corresponding product (the alternative existing product) table of comparisons.

Table 2 is the table of comparisons of 1 * 3 die drawing steel strand and 1 * 3 steel strand.

Five, the specific embodiment:

As shown in Figure 1, 2: a kind of 1 * 3 structure die drawing steel strand for prestressed concrete forms the steel strand of being made up of for approximate drop-shaped steel wire 1 three cross sections through mould drawing and stabilization processes by three round wires again after twisting.The line of these three steel wire top bump 2 is the circumscribed circle of these steel strand.These three steel wires are twisted together mutually and form helicla flute 3 between per two projectioies.

Shown in table 1,2; 7.0mm 1 * 3 structure die drawing steel strand can finish and substitute 7.0mm spiral ribs compressor wire, on performance,, improve a lot than the tensile strength of 7.0mm spiral ribs compressor wire because of its compression ratio height.And the breaking load of whole steel strand is slightly larger than 7.0mm spiral ribs compressor wire.Because of this product is made up of three steel wires, has reduced the whole possibility that fracture of wire is disrumpent feelings behind the alternative 7.0mm steel wire, thereby increased the security performance that rises when drawing.And its economy because 7.0mm1 * 3 structure die drawing steel strands use the different of raw material specification with 7.0 helix rib steel wires, is being saved about 500 yuan/ton of costs on the raw material, save steel because of sectional area reduces again, and its cost of production is basic identical.

7.0mm1 * 3 structure die drawing steel strands are than former 8.6mm1 * 3 structural iron twisted wires are greatly improved in quality, but its cost of production is basic identical.Therefore, on being worth, large increase has been arranged.

1 * 3 structure die drawing steel strand can substitute 1 * 7 structure underrelaxation steel strand of 9.53mm fully, though its raw materials for production are identical, because of 1 * 7 structure underrelaxation steel strand investment of production equipment is big, it is little to produce this gauge steel twisted wire output, the depreciation cost height is not so satisfy the market demand.The present invention then need not to consider its cost and production problems, can satisfy market demand.

Claims

1, a kind of 1 * 3 structure die drawing steel strand for prestressed concrete is characterized in that: by three cross sections is that different in nature steel wire is formed; These steel wires are twisted together mutually that the back forms has the spiral fluted steel strand.

2,1 * 3 structure die drawing steel strand for prestressed concrete according to claim 1 is characterized in that: the cross section was the star symmetry after above-mentioned different in nature steel wire was twisted together mutually, formed helicla flute between per two projectioies.

3,1 * 3 structure die drawing steel strand for prestressed concrete according to claim 1, it is characterized in that: the cross section of every different in nature steel wire is a drops in the above-mentioned steel strand, the line of its top bump is the circumscribed circle of steel strand.