CN107739164B - End-anchored spiral steel fiber and manufacturing and processing method thereof - Google Patents
End-anchored spiral steel fiber and manufacturing and processing method thereof Download PDFInfo
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- CN107739164B CN107739164B CN201711234589.1A CN201711234589A CN107739164B CN 107739164 B CN107739164 B CN 107739164B CN 201711234589 A CN201711234589 A CN 201711234589A CN 107739164 B CN107739164 B CN 107739164B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F45/00—Wire-working in the manufacture of other particular articles
- B21F45/006—Wire-working in the manufacture of other particular articles of concrete reinforcement fibres
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/012—Discrete reinforcing elements, e.g. fibres
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Abstract
The invention discloses an end-anchored spiral steel fiber and a manufacturing and processing method thereof, wherein the steel fiber comprises a middle section and anchoring ends arranged at two ends of the middle section, the anchoring ends are connected with the middle section through smooth transition sections, the middle section, the anchoring ends and the smooth transition sections are integrally formed by a same steel wire, the middle section is in a spiral shape and is formed by rolling and flattening the steel wire into a sheet body with a waist-shaped cross section and then spirally twisting the steel wire; the manufacturing and processing method of the steel fiber comprises the following steps: clamping and fixing the steel wire; flattening the middle section of the steel fiber; helical twisting of the middle section of the steel fiber; and (5) intercepting the steel fibers. The steel fiber adopting the structure has excellent bonding and anchoring performance with a concrete matrix, can fully exert the strength of high-strength steel, is not easy to agglomerate in the mixing construction process of fiber concrete, has good dispersibility, and can obviously improve the reinforcing and toughening effects of the high-strength steel fiber on the concrete.
Description
Technical Field
The invention relates to the field of building materials, in particular to a novel end-anchored spiral steel fiber and a manufacturing and processing method thereof.
Background
The steel fiber concrete is a novel multiphase composite material formed by doping short steel fibers which are distributed disorderly into common concrete. The disorderly distributed steel fibers can effectively prevent the expansion of micro cracks and the formation of macro cracks in the concrete caused by shrinkage and plastic deformation, remarkably improve the tensile, bending, impact and fatigue resistance of the concrete, and have better ductility, toughness and durability. Therefore, steel fiber concrete is playing an increasingly important role in engineering practice as an important modified concrete.
The fiber spacing theory, the composite material theory and a large amount of experimental researches show that the reinforcing and toughening effects of the steel fibers on the concrete are mainly determined by the strength f of a concrete matrix c Steel fibreThe aspect ratio of the fibers (the ratio of the length l of the fibers to the diameter d, i.e. l/d), the volume fraction of the steel fibers, the strength of the bond between the fibers and the matrix (τ), and the distribution and orientation of the fibers in the matrix (η). When the steel fiber concrete is broken, most of the steel fibers are pulled out rather than being pulled apart. Therefore, improving the bonding strength between the fiber and the matrix is one of the main control factors for improving the fiber reinforcement effect. At present, steel fibers commonly used at home and abroad mainly comprise straight steel fibers, pressed prismatic steel fibers, corrugated steel fibers, hook-shaped steel fibers, large-head-shaped steel fibers, double-tip-shaped steel fibers, bundling steel fibers, spiral steel fibers and the like. Among them, the Steel fibers closer to the present invention include a spiral twist type Steel fiber (Wangwang, luo Guangdao. CN2063548 new spiral Steel fiber, 10.10.1990) and the Twisted Steel Micro Rebar (TSMR) of HelixSteel corporation, USA. Relevant researches show that the spiral steel fibers can form good bond stress with concrete, can effectively restrain the dry shrinkage of an aggregate interface and the frictional resistance during shrinkage, greatly increase the energy absorbed in the process of pulling out the fibers in the concrete by the spiral ribs, and can obviously improve the bonding effect between the fibers and a matrix. However, when the spiral steel fiber reinforced concrete is finally broken, the steel fiber is often pulled out from the concrete matrix instead of being broken, and the strength of the high-strength steel is not fully utilized.
Therefore, in order to fully exert the reinforcing and toughening effects of the high-strength steel fibers on concrete, it is urgently needed to develop a novel steel fiber which has excellent anchoring performance with a concrete matrix and can fully exert the strength of high-strength steel, optimize the adverse effect of appearance parameters to control fiber agglomeration in the mixing construction process, and ensure good dispersibility of the fiber in concrete so as to prepare the high-performance steel fiber concrete.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the anchoring performance of the existing high-strength steel fiber and a concrete matrix, the novel end-anchored spiral steel fiber and the manufacturing and processing method thereof are provided, the novel end-anchored spiral steel fiber has excellent bonding and anchoring performance with the concrete matrix, can fully exert the strength of high-strength steel, is not easy to agglomerate in the process of mixing and constructing fiber concrete, has good dispersibility, and can obviously improve the reinforcing and toughening effects of the high-strength steel fiber on the concrete.
The invention solves the problems through the following technical means:
the utility model provides a spiral steel fibre of end anchor type, includes the interlude and sets up the anchor end at the interlude both ends, the anchor end is connected with the interlude through smooth transition section, interlude, anchor end and smooth transition section are by same root steel wire integrated into one piece, and the interlude is the heliciform, and it is rolled flat by the steel wire and is the cross section and twists reverse the formation for the lamellar body back spiral of waist shape.
Furthermore, the total length of the steel fiber is 20-60mm, the ratio of the total length of the steel fiber to the diameter of the steel wire used for forming the steel fiber is 30-80, the length of the anchoring end is 0.5-2 times of the diameter of the steel wire, and the length of the smooth transition section is 0.5-1 times of the diameter of the steel wire.
Furthermore, the thickness of the sheet body is 0.3-0.6 times of the diameter of the steel wire, the width of the sheet body is 1.5-2.2 times of the diameter of the steel wire, and the thread pitch of the formed spiral body is 4-8mm.
Further, the smooth transition section is a natural transition section formed at the boundary position in the steel wire rolling process.
Furthermore, the diameter of the selected steel wire is 0.5-1mm.
The manufacturing and processing of the steel fiber comprises the following steps:
s301: clamping and fixing the steel wire;
s302: flattening the middle section of the steel fiber: flattening a steel wire section for forming the middle section of the steel fiber into a sheet-shaped body with a waist-shaped cross section;
s303: helical twisting of the middle section of the steel fiber: the middle section of the steel fiber is spirally twisted into a spiral shape;
s304: cutting steel fibers: and cutting the formed steel fibers from the steel wire section by section in sequence.
The invention has the beneficial effects that:
the utility model provides a steel fibre that combines to use with concrete, through bonding and the anchor between screw form interlude reinforcing steel fibre and the concrete, the rethread sets up the tip anchor that realizes steel fibre at the changeover portion at both ends and anchor end, avoided the interlude to appear steel fibre and extracted from the concrete after the slippage, the stirring agglomeration and the bad problem of dispersibility of having avoided the too big bringing of anchor end, can the reinforcing of full play high-strength steel fibre in the concrete with the effect of toughening. In more detail, compared with the prior art, the invention has the following beneficial effects:
1. the steel fiber provided by the invention not only has the advantage of good bonding and anchoring performance of the traditional spiral steel fiber and a concrete matrix, but also is provided with a second anchoring defense line after the interface of the spiral rib and the concrete matrix slides, and reliable anchoring in the concrete is realized by virtue of transition sections and anchoring ends at two ends of the fiber.
2. The outer contour of the spiral body in the middle section of the steel fiber main body is a smooth drum-shaped curved surface, the diameter of the cylinder at the anchoring ends at two ends is smaller than the outer diameter of the spiral body in the middle section, the steel fiber main body is not easy to agglomerate in the process of fiber concrete mixing construction, the dispersibility of the steel fiber is good, and the mixing quality of the fiber concrete is ensured.
3. The steel fiber of the invention takes high-strength steel wires as raw materials, has simple structure, simple and convenient manufacture, lower comprehensive cost and wide market prospect.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic diagram of the structure of an end-anchored spiral steel fiber in an example.
Fig. 2 is a cross-sectional view of a middle section of a steel fiber in an example.
Fig. 3 is a cross-sectional view of the steel-fibre anchored end in an embodiment.
FIG. 4 is a flow chart of the manufacturing process of the end-anchored spiral steel fiber in the embodiment.
The reference numbers in the figures: 1-end anchor type spiral steel fiber, 11-middle section, 12-anchor end, and 13-smooth transition section.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
As shown in fig. 1-3, the end-anchored spiral steel fiber 1 shown in the drawings comprises a middle section 12 integrally formed by a same cylindrical steel wire, anchoring ends 11 disposed at both ends of the middle section, and a smooth transition section 13 for connecting the anchoring ends and the middle section, wherein the diameter of the steel wire is 0.5-1mm, the anchoring ends maintain a circular cross section with a diameter equal to that of the steel wire, the middle section is a main body of the steel fiber, the middle section is in a spiral shape, the outer contour is a smooth drum-shaped curved surface, the steel wire is rolled into a flat sheet body with a waist-shaped cross section, the formed spiral body has a pitch of 4-8mm, the thickness of the sheet body is less than the diameter of the steel wire, the maximum width of the sheet body is greater than the diameter of the steel wire, thereby ensuring that the outer diameter of the spiral body in the middle section is significantly greater than the diameter of the cylindrical anchoring end at the end and the thickness of the sheet body is less than the diameter of the cylindrical end at the end, preferably, the thickness of the sheet body is 0.3-0.6 times the diameter of the steel wire and the width is 1.5-2.2 times the diameter of the steel wire; the structural design has the advantages that: the spiral middle section structure can enhance the bonding and anchoring between the steel fiber and the concrete; the anchoring end is cylindrical, the diameter of the anchoring end is smaller than the outer diameter of the spiral body at the middle section, on one hand, the end part of the steel fiber is anchored through the anchoring end, and a second anchoring defense line is formed after the spiral rib and the concrete matrix interface slide, so that the steel fiber is prevented from being pulled out of the concrete after the middle section slides, and the reliability of the combination of the steel fiber and the concrete matrix is improved; on the other hand, the diameter of the cylinder at the anchoring ends at the two ends is smaller than the outer diameter of the middle section spiral body, so that the cylinder is not easy to agglomerate in the fiber concrete mixing construction process, the dispersibility of steel fibers is better, and the mixing quality of the fiber concrete is ensured. The smooth transition section is a natural transition section formed at the boundary position in the steel wire flattening process.
In this embodiment, the total length of the steel fiber is 20-60mm, preferably 25-50 mm, the ratio of the total length of the steel fiber to the diameter of the steel wire used for forming the steel fiber is 30-80, the length of the anchoring end is 0.5-2 times of the diameter of the steel wire, the length of the smooth transition section is 0.5-1 times of the diameter of the steel wire, the length of the total length of the steel fiber excluding the anchoring end at both ends and the length of the smooth transition section is the length of the middle section of the steel fiber, and the length of the middle section is not less than 4 times of the pitch length.
The manufacturing and processing of the steel fiber comprise the following steps:
s301: clamping and fixing the steel wire;
s302: flattening the middle section of the steel fiber: rolling a steel wire section for forming the middle section of the steel fiber into a sheet-shaped body with a waist-shaped cross section, and naturally forming flat smooth transition sections on two sides of the middle section;
s303: helical twisting of the middle section of the steel fiber: the middle section of the steel fiber is spirally twisted into a spiral shape;
s304: cutting steel fibers: and (3) intercepting the formed steel fibers from the steel wire section by section in sequence, wherein in the intercepting process, a cylinder steel wire with a proper size is reserved at one end, far away from the middle section, of the smooth transition section so as to form an anchoring end of the steel fibers. FIG. 4 is a flow chart of the manufacturing process of steel fiber. The whole process is simple and convenient, and the cost is low.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (3)
1. The manufacturing and processing method of the end anchor type spiral steel fiber is characterized in that the end anchor type spiral steel fiber comprises a middle section and anchor ends arranged at two ends of the middle section, the anchor ends are connected with the middle section through smooth transition sections, the middle section, the anchor ends and the smooth transition sections are integrally formed by a same steel wire, the middle section is in a spiral shape and is formed by spirally twisting the steel wire after rolling into a flat sheet body with a waist-shaped cross section, the thickness of the sheet body is 0.3-0.6 times of the diameter of the steel wire, the width of the sheet body is 1.5-2.2 times of the diameter of the steel wire, and the thread pitch for forming the spiral body is 4-8mm; the smooth transition section is a natural transition section formed at the boundary position in the steel wire rolling process; the processing method comprises the following steps:
s301: clamping and fixing the steel wire;
s302: flattening the middle section of the steel fiber: flattening a steel wire section for forming the middle section of the steel fiber into a sheet-shaped body with a waist-shaped cross section;
s303: helical twisting of the middle section of the steel fiber: the middle section of the steel fiber is spirally twisted into a spiral shape;
s304: cutting steel fibers: and cutting the formed steel fibers from the steel wire section by section in sequence.
2. The manufacturing and processing method of the end-anchored spiral steel fiber according to claim 1, wherein the method comprises the following steps: the total length of the steel fiber is 20-60mm, the ratio of the total length of the steel fiber to the diameter of the steel wire used for forming the steel fiber is 30-80, the length of the anchoring end is 0.5-2 times of the diameter of the steel wire, and the length of the smooth transition section is 0.5-1 times of the diameter of the steel wire.
3. The manufacturing and processing method of the end-anchored spiral steel fiber according to claim 1, wherein the method comprises the following steps: the diameter of the selected steel wire is 0.5-1mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711234589.1A CN107739164B (en) | 2017-11-30 | 2017-11-30 | End-anchored spiral steel fiber and manufacturing and processing method thereof |
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| CN201711234589.1A CN107739164B (en) | 2017-11-30 | 2017-11-30 | End-anchored spiral steel fiber and manufacturing and processing method thereof |
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| CN107739164A CN107739164A (en) | 2018-02-27 |
| CN107739164B true CN107739164B (en) | 2022-12-16 |
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| CN113636771B (en) * | 2021-09-06 | 2023-04-28 | 浙江理工大学 | Arc-shaped steel fiber, manufacturing mold and method and concrete using steel fiber |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2063548U (en) * | 1989-11-22 | 1990-10-10 | 武汉水利电力学院 | Twisty steel fibre |
| CA2277971A1 (en) * | 1997-02-28 | 1998-09-03 | N.V. Bekaert S.A. | Steel fibre for reinforcement of high-performance concrete |
| CN101029531A (en) * | 2007-03-30 | 2007-09-05 | 武汉新途工程纤维制造有限公司 | Steel fibre with multi-anchor fixed point |
| CN101122161A (en) * | 2007-03-30 | 2008-02-13 | 武汉新途工程纤维制造有限公司 | Steel fibre with multi-anchor fixed point |
| CN201292609Y (en) * | 2008-09-25 | 2009-08-19 | 刘纯郴 | Bidirectional anchoring steel fiber |
| CN202359740U (en) * | 2011-09-15 | 2012-08-01 | 江苏博特新材料有限公司 | End hook type steel fiber |
| CN202626044U (en) * | 2012-04-18 | 2012-12-26 | 江苏博特新材料有限公司 | Spiral-type steel fiber with special-shaped section |
-
2017
- 2017-11-30 CN CN201711234589.1A patent/CN107739164B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2063548U (en) * | 1989-11-22 | 1990-10-10 | 武汉水利电力学院 | Twisty steel fibre |
| CA2277971A1 (en) * | 1997-02-28 | 1998-09-03 | N.V. Bekaert S.A. | Steel fibre for reinforcement of high-performance concrete |
| CN101029531A (en) * | 2007-03-30 | 2007-09-05 | 武汉新途工程纤维制造有限公司 | Steel fibre with multi-anchor fixed point |
| CN101122161A (en) * | 2007-03-30 | 2008-02-13 | 武汉新途工程纤维制造有限公司 | Steel fibre with multi-anchor fixed point |
| CN201292609Y (en) * | 2008-09-25 | 2009-08-19 | 刘纯郴 | Bidirectional anchoring steel fiber |
| CN202359740U (en) * | 2011-09-15 | 2012-08-01 | 江苏博特新材料有限公司 | End hook type steel fiber |
| CN202626044U (en) * | 2012-04-18 | 2012-12-26 | 江苏博特新材料有限公司 | Spiral-type steel fiber with special-shaped section |
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