CN203474660U

CN203474660U - Steel fiber for centrosymmetric steel wire

Info

Publication number: CN203474660U
Application number: CN201320418046.6U
Authority: CN
Inventors: 刘加平; 吕进; 刘建忠; 崔巩; 周华新
Original assignee: Sobute New Materials Co Ltd; Jiangsu Bote New Materials Co Ltd; Jiangsu Research Institute of Building Science Co Ltd
Current assignee: Sobute New Materials Co Ltd
Priority date: 2013-07-12
Filing date: 2013-07-12
Publication date: 2014-03-12
Anticipated expiration: 2023-07-12

Abstract

The utility model provides steel fiber for a centrosymmetric steel wire. The middle part of the steel fiber is a straight section; the two ends of the straight section are bent in an opposite direction to form an inclined first line section; the bottom end of the first line section is bent again to form a second line section parallel to the straight section. The steel fiber has a simple structure and is low in cost and convenient to construct; the adhesive property between the steel fiber and the concrete is good, and a toughening effect on concrete is excellent; the toughening and strengthening functions on concrete by the steel fiber can be greatly improved; the local defect can be greatly reduced, thus improving the durability of the concrete structure and prolonging the service life of buildings.

Description

A kind of centrosymmetry steel wire steel fiber

Technical field

The utility model relates to and belongs to building material field, and particularly a kind of steel fiber, more specifically relates to a kind of centrosymmetry steel wire steel fiber.

Background technology

Steel Fiber Reinforced Concrete is because it can significantly improve concrete toughness, intensity, thus the work-ing life of improving concrete weather resistance and prolongation buildings, so obtain increasingly extensive application in the engineerings such as road, bridge, tunnel, water conservancy project, airport.Existing performance preferably drawn wire steel fiber is generally bow type, sees Fig. 1, and its outward appearance is axisymmetric shape; Yet, steel fiber is random distribution in concrete, because the distribution arrangement of steel fiber is different, constraint when it is subject to load to concrete is not identical yet, inhomogenous concrete easily constraint compared with little place because the load compared with little first produces destruction, finally cause the global failure of concrete material.

Utility model content

Utility model object: the purpose of this utility model is to provide a kind of can be evenly toughness reinforcing, centrosymmetry shaped wire steel fiber of strengthening concrete material.

Technical scheme: a kind of centrosymmetry steel wire steel fiber that the utility model provides, the middle portion of described steel fiber is flat segments, the two ends of flat segments are relatively oppositely bent to form the first line segment of inclination, and the bottom of the first line segment is bent into second line segment parallel with flat segments again.

This centrosymmetry steel wire steel fiber, intermediate portion part is flat segments, the two ends of flat segments are bent to form respectively the first line segment of inclination in the other direction, the the first line segment tail end tilting is bent into second line segment parallel with neutral straight section again, thus the shaped wire steel fiber of symmetry centered by having formed on the whole; Anchorage effect is partly played in the bending at steel fiber flat segments two ends, increases the cohesive strength of steel fiber and concrete substrate.

As preferably, its diameter of the steel fiber that the utility model provides is 0.5～0.9mm, and nominal length is 25～60mm, and length-to-diameter ratio is 50～80.

Preferred as another kind, the length of the flat segments of this centrosymmetry steel wire steel fiber accounts for the more than 2/3 of its total length; Thereby when the utility model steel fiber is applied in concrete, can better bring into play the effect of its two ends anchoring, in concrete-agitating process, reduce clustering phenomena simultaneously.

Preferred as another kind, the flat segments of this centrosymmetry steel wire steel fiber and the angle of the first line segment are 120～135 °; Thereby better bring into play its two ends anchorage effect, guaranteed the dispersing property of steel fiber in concrete simultaneously.

Preferred as another kind, described steel fiber tensile strength is more than 1000MPa; In concrete loading process, if steel fiber can be pulled off but not extract, so such steel fiber is limited for improving toughness of concrete effect, yet, steel fiber tensile strength 1000MPa is above can guarantee that steel fiber is pulled out but not breaks in concrete loading process, thereby effectively brings into play steel fiber to concrete toughening effect.

Beneficial effect: centrosymmetry steel wire steel fiber that the utility model provides is simple in structure, with low cost, easy construction, itself and Bond Performance Between Concrete are good, good to concrete toughening effect, can greatly improve steel fiber to concrete toughness reinforcing, enhancement, greatly reduce local defect, thereby improve the weather resistance of concrete structure, the work-ing life of prolongation buildings.

Particularly, the centrosymmetry steel wire steel fiber that the utility model provides comprises the bending segment that plays anchorage effect that flat segments two ends arrange respectively, and its integral body is centrosymmetric.This steel fiber admixture is entered in concrete, when concrete is subject to external loads, steel fiber all directions in concrete are stressed evenly, concrete is produced to even effect of contraction, the impact of the orientation degree that do not distributed, can be because steel fiber be in distribution angle, difference in direction and produce difference, guarantee that load is evenly distributed to each position, can significantly improve concrete toughness, avoided concrete under less load, to destroy because of restraint force difference, can obviously promote concrete intensity, bend ductility and cracking resistance, shock resistance, guaranteed the concrete life-span.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing bow type steel fibers.

Fig. 2 is the structural representation of the utility model centrosymmetry steel wire steel fiber.

Embodiment

Below in conjunction with accompanying drawing, centrosymmetry steel wire steel fiber of the present utility model is further illustrated.

Traction by steel wire by traction type equipment enters moulding pinch roller and is rolled into the two ends abnormally-structured shape that bending is centrosymmetric respectively in the other direction, after moulding, cuts off and obtains length range at the centrosymmetry steel wire steel fiber of 25～60mm again.

Centrosymmetry steel wire steel fiber, is shown in Fig. 2, and intermediate portion is divided into flat segments 1, and the bottom that the two ends of flat segments 1 are relatively oppositely bent to form the first line segment 2, the first line segments 2 of inclination is bent into second line segment 3 parallel with flat segments 1 again.

Adopt aforesaid method, make one group of steel fiber sample, its structural parameter are in Table 1.

Table 1 is the structural parameter of one group of steel fiber sample of the utility model

Above-mentioned steel fiber is mixed in concrete, and volume content of steel fibers is 60kg/m ³make Steel Fiber Reinforced Concrete, after normal curing 28 days, by < < CECS13-2009 fibrous concrete test method standard method > >, measure Steel Fiber Reinforced Concrete mechanical property, the results are shown in Table 2.Using and do not add Steel Fiber Reinforced Concrete as benchmark, the arc steel fiber (see figure 2) that the diameter of take is 1100MPa as 0.75mm, nominal length 60mm, length-to-diameter ratio 80, flat segments and bending segment angle as 125 °, tensile strength in contrast.

Table 2 is Steel Fiber Reinforced Concrete mechanical property

Claims

1. a centrosymmetry steel wire steel fiber, it is characterized in that: the middle portion of described steel fiber is flat segments (1), the two ends of flat segments (1) are relatively oppositely bent to form first line segment (2) of inclination, and the bottom of the first line segment (2) is bent into second line segment (3) parallel with flat segments (1) again.

2. a kind of centrosymmetry steel wire steel fiber according to claim 1, is characterized in that: its diameter of described steel fiber is 0.5～0.9mm, and nominal length is 25～60mm, and length-to-diameter ratio is 50～80.

3. a kind of centrosymmetry steel wire steel fiber according to claim 1, is characterized in that: the length of described flat segments (1) accounts for the more than 2/3 of steel fiber total length.

4. a kind of centrosymmetry steel wire steel fiber according to claim 1, is characterized in that: described flat segments (1) is 120～135 ° with the angle of the first line segment (2).

5. a kind of centrosymmetry steel wire steel fiber according to claim 1, is characterized in that: described steel fiber tensile strength is more than 1000MPa.