A high-bonding steel fiber for concrete

Abstract

The present invention relates to a high-binding force steel fiber for concrete applied in the field of steel fiber technology. On the basis of bending the steel fiber multiple times, a forked fiber matched with a steel fiber matrix is ​​also provided. The two can form a cross shape after being assembled. When combined with concrete, the concrete will be in cross contact with the steel fiber. Compared with the treatment of only bending, even if the concrete cracks and the steel fiber is stressed, it is difficult to separate the concrete from the crossed steel fiber. The cross structure of the two greatly improves the bonding force between the concrete and the concrete, so that the effect of improving the strength of the concrete is better. In addition, in conjunction with the operation of covering with a one-way pasting treatment, the end of the forked fiber and the steel fiber matrix can be formed into a "stone lump", thereby limiting the position of the forked fiber, making it difficult for it to be relatively displaced with the steel fiber matrix, thereby effectively ensuring the stability of the crossed steel fiber.

Description

Technical Field

[0001] The invention relates to a steel fiber, in particular to a high-binding strength steel fiber for concrete applied in the technical field of steel fibers. Background Art

[0002] Steel fiber concrete is a new type of multiphase composite material formed by adding randomly distributed short steel fibers to ordinary concrete. These randomly distributed steel fibers can effectively hinder the expansion of micro cracks in concrete and the formation of macro cracks, significantly improving the tensile, bending, impact and fatigue resistance of concrete, and have good ductility.

[0003] In order to improve the sliding resistance and bonding strength with concrete, existing steel fibers are generally bent. For example, the three-dimensional steel fibers disclosed in the specification of Chinese patent CN203867073U and the ball-marked steel fibers disclosed in the specification of Chinese patent CN2359369Y make the steel fibers non-linear. However, since steel fibers are generally small, the effect of simply bending them is poor in improving the bonding strength, and it is difficult to adapt to the development needs of today's high-strength concrete. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the bonding strength between the existing steel fibers which are only processed by bending and the concrete is poor.

[0005] In order to solve the above problems, the present invention provides a high-binding force steel fiber for concrete, comprising a steel fiber matrix, forked fibers that conflict with each other at both ends of the steel fiber matrix, and a plurality of three-dimensional sleeves uniformly wound around the forked fibers, the steel fiber matrix comprising a middle flat section, blunt bend sections respectively fixedly connected to both ends of the middle flat section, two inclined sections respectively fixedly connected to one end of the blunt bend section away from each other, two sharp bend sections respectively fixedly connected to one end of the inclined section away from each other, two vertical flat sections respectively fixedly connected to the lower end of the sharp bend section, and a flat bend section fixedly connected to the ends of the two vertical flat sections, the end of the flat bend section faces one side of the middle flat section, the plurality of three-dimensional sleeves are all located between the two inclined sections, an inner limiting hole is drilled on the inclined section, an outer limiting hole is drilled at the bend of the flat bend section, and the two ends of the forked fiber are respectively movable through the two inner limiting holes and inserted into the adjacent outer limiting holes;

[0006] The three-dimensional sleeve includes a spiral section wound around the forked fiber, an outward folded extension section and an end ring respectively fixedly connected to both ends of the spiral section, and the end ring is simultaneously sleeved on the forked fiber and the connection between the spiral section and the outward folded extension section of the adjacent three-dimensional sleeve;

[0007] The forked fiber includes a large diameter section and two reduced diameter sections respectively fixedly connected to both ends of the large diameter section, the reduced diameter section matches the outer limiting hole, and the large diameter section matches the inner limiting hole;

[0008] The production method of high-bonding steel fiber for concrete comprises the following steps:

[0009] S1. First, the steel is subjected to wire drawing through different dies to obtain two types of steel wires with rectangular and circular cross-sections;

[0010] S2, steel wires with rectangular cross-sections are arranged side by side by brushing with hydrosol, and then cut and segmented according to the target length of the steel fibers to obtain steel sheets, and then both ends of each steel wire on the steel sheet are punched to form inner limit holes and outer limit holes, and then both ends of the steel sheet are bent three times, and the three bends at both ends are symmetrical to each other;

[0011] S3, winding a surface increasing sleeve at a certain interval outside the steel wire with a circular cross section, the surface increasing sleeve is composed of a plurality of three-dimensional sleeves wrapped front and back, cutting the steel wire with a circular cross section into sections to obtain a plurality of forked fibers with the surface increasing sleeve, and cutting the two ends of the forked fibers to reduce the diameter of the end;

[0012] S4. First, pass one end of the forked fiber through the inner limiting hole and the outer limiting hole on the same side in sequence, then pressurize the forked fiber to make it arc-shaped, and then pass the other end of the forked fiber through the inner limiting hole and the outer limiting hole on the other side in sequence, and finally wash and dry it to obtain a cross-three-dimensional high-binding strength steel fiber.

[0013] In the above-mentioned high-bonding strength steel fiber for concrete, on the basis of multiple bending of the steel fiber, a forked fiber matching the steel fiber matrix is ​​also provided. The two can form a cross shape after assembly. When combined with concrete, the concrete will be in cross contact with the steel fiber. Compared with the treatment of only bending, the bonding strength between the steel fiber and the concrete is greatly improved, so that the effect of improving the strength of the concrete is better.

[0014] As a further improvement of the present application, the bending angle of the blunt bend section is 120-150°, the bending angle of the sharp bend section is 30-60°, and the bending angle of the flat bend section is a right angle.

[0015] As a further improvement of the present application, the inner diameter of the inner limit hole is larger than that of the outer limit hole, and the inner diameter of the outer limit hole is between the inner diameters of the large diameter section and the reduced diameter section, the forked fibers are in a horizontal state when not connected to the steel fiber matrix, and the length of the forked fibers is greater than the distance between the two vertical flat sections.

[0016] As another improvement of the present application, before performing step S4, the third bending parts at both ends of the steel sheet are first covered with a one-way sticker, and a FiberFix tape is fixedly attached to the back of the one-way sticker. When covering the one-way sticker, multiple protrusions on the one-way sticker are made to face the multiple external limiting holes and penetrate the external limiting holes, and then the surface of the one-way sticker is sprayed with water to allow water to penetrate into the back of the one-way sticker, so that the one-way sticker and the steel sheet are stably bonded;

[0017] When performing step S4, after the end of the reduced diameter section is inserted into the protrusion at the outer limit hole, the reduced diameter section squeezes the internal space of the protrusion, causing the cement powder inside to mix with water, and at the same time causing the end of the protrusion to increase abnormally. Subsequently, the cement powder is mixed with water and hardened, thereby forming a "stone lump" at the end of the forked fiber across the flat bend section, limiting the position of the forked fiber and making it difficult for it to shift relative to the steel fiber matrix.

[0018] As another improved supplement of the present application, the one-way patch includes a plurality of membranes bonded in sequence by a hydrosol and a plurality of pre-expanded protrusions respectively fixedly connected to the back of the membranes. The membrane has a double-layer structure, and a layer of the membrane away from the pre-expanded protrusions is a hard porous structure, and the other layer of the membrane is made of a hard water-absorbent material.

[0019] As another improved supplement of the present application, the pre-expanded protrusion includes a molding section fixedly connected to the diaphragm, an outer sleeve fixedly connected to the outer end of the molding section, and a coating layer fixedly connected to the inner wall of the molding section close to the outer sleeve, the outer sleeve is filled with water, the coating layer is filled with cement powder, and the mouth of the molding section is sealed by an elastic membrane.

[0020] As another improved supplement of the present application, the outer sleeve is made of a highly elastic silicone material, the coating layer is made of a thin sealing material, the molding section is a hard molding structure, and the inner diameter of the molding section is consistent with the reduced diameter section.

[0021] In summary, on the basis of multiple bending of the steel fibers, forked fibers matching the steel fiber matrix are also provided, and the two can form a cross shape after assembly. When combined with concrete, the concrete will be in cross contact with the steel fibers. Compared with the treatment of bending only, even if the concrete cracks and the steel fibers are subjected to stress, it is difficult to separate the concrete from the crossed steel fibers. The cross structure of the two greatly improves the bonding force between the concrete and the concrete, and has a better effect on improving the strength of the concrete. In addition, with the operation of unidirectional pasting, the ends of the forked fibers and the steel fiber matrix can be formed into "stone lumps", thereby limiting the position of the forked fibers, making it difficult for them to have relative displacement with the steel fiber matrix, thereby effectively ensuring the stability of the crossed steel fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of the steel fiber according to the first embodiment of the present application;

[0023] Figure 2 This is a three-dimensional diagram of the first embodiment of the present application when the forked fiber is not installed in the steel fiber matrix;

[0024] Figure 3 This is an exploded schematic diagram of the separation of the forked fibers from the multiple three-dimensional sleeves according to the first embodiment of the present application;

[0025] Figure 4 This is a front view of a steel fiber matrix according to a first embodiment of the present application;

[0026] Figure 5 This is a front comparison diagram of the steel fiber matrix of the first embodiment of the present application before and after being installed into forked fibers;

[0027] Figure 6 This is a schematic diagram of the second embodiment of the present application during the one-way tape application process;

[0028] Figure 7 This is a schematic diagram of the outer limiting hole portion on the side of the one-way sticker in the second embodiment of the present application;

[0029] Figure 8 This is a schematic diagram of the side surface of the one-way sticker of the second embodiment of the present application;

[0030] Fig. 9 This is a schematic diagram of the second embodiment of the present application when the end of the forked fiber is inserted into the protrusion of the unidirectional tape;

[0031] Fig.10 This is a front view of the steel fiber with "stone lumps" in the second embodiment of the present application.

[0032] Description of the numbers in the figure:

[0033] 1 steel fiber matrix, 101 inner limiting hole, 102 outer limiting hole, 11 middle flat section, 12 inclined section, 13 vertical flat section, 141 blunt bending section, 142 sharp bending section, 143 flat bending section, 2 forked fiber, 21 large diameter section, 22 reduced diameter section, 3 three-dimensional sleeve, 31 spiral section, 32 outer folded extension section, 33 end ring, 41 diaphragm, 42 pre-expanded convex head, 421 shaping section, 422 coating layer, 423 outer sleeve. DETAILED DESCRIPTION

[0034] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1-2FIG. 1 shows a high-binding strength steel fiber for concrete, comprising a steel fiber matrix 1, forked fibers 2 mutually abutting against each other at both ends of the steel fiber matrix 1, and a plurality of three-dimensional sleeves 3 uniformly wound around the forked fibers 2, and the two three-dimensional sleeves 3 at the edges respectively abut against the adjacent inclined sections 12, thereby effectively ensuring the stability of the plurality of three-dimensional sleeves 3 on the forked fibers 2, making it difficult for them to move along the forked fibers 2, thereby making it more stable when combined with concrete, and the steel fiber matrix 1 comprises a middle flat section 11, blunt bend sections 141 respectively fixedly connected to both ends of the middle flat section 11, and two blunt bend sections 141 respectively fixedly connected to each other at the blunt bend sections 141. An inclined surface section 12 away from one end, two sharp bend sections 142 respectively fixedly connected to the inclined surface section 12 and away from one end thereof, two vertical flat sections 13 respectively fixedly connected to the lower ends of the sharp bend sections 142, and a flat bend section 143 fixedly connected to the ends of the two vertical flat sections 13, the ends of the flat bend sections 143 facing the side of the middle flat section 11, a plurality of three-dimensional sleeves 3 are all located between the two inclined surface sections 12, an inner limiting hole 101 is bored on the inclined surface section 12, an outer limiting hole 102 is bored at the bend of the flat bend section 143, and the two ends of the forked fiber 2 respectively moveably penetrate the two inner limiting holes 101 and are inserted into the adjacent outer limiting holes 102; Figure 4 The bending angle of the blunt bend section 141 is 120-150°, the bending angle of the sharp bend section 142 is 30-60°, and the bending angle of the flat bend section 143 is a right angle.

[0037] like Figure 3 The three-dimensional sleeve 3 includes a spiral section 31 wound around the forked fiber 2, an outward folded extension section 32 and an end ring 33 respectively fixedly connected to both ends of the spiral section 31. The end ring 33 is simultaneously sleeved on the forked fiber 2 and the connection between the spiral section 31 and the outward folded extension section 32 of the adjacent three-dimensional sleeve 3, so that the end ring 33 on the adjacent three-dimensional sleeve 3 can press the end of the adjacent three-dimensional sleeve 3, so that the outward folded extension section 32 at the end can stably extend outward and is not easy to loosen, so that the steel fiber can be subjected to forces in multiple directions when combined with concrete, thereby improving the bonding strength between the steel fiber and the concrete;

[0038] like Figure 1-2The forked fiber 2 includes a large diameter section 21 and two reduced diameter sections 22 respectively fixedly connected to both ends of the large diameter section 21, the reduced diameter section 22 matches the outer limiting hole 102, the large diameter section 21 matches the inner limiting hole 101, the inner diameter of the inner limiting hole 101 is larger than the outer limiting hole 102, and the inner diameter of the outer limiting hole 102 is between the inner diameters of the large diameter section 21 and the reduced diameter section 22. When the forked fiber 2 is not connected to the steel fiber matrix 1, it is in a horizontal state, and the length of the forked fiber 2 is greater than the distance between the two vertical flat sections 13. When it passes through the inner limiting hole 101 and the outer limiting hole 102 and is connected to the steel fiber matrix 1, its two ends will be subjected to resistance force, and then present an arc shape, so that the connection stability between the forked fiber 2 and the steel fiber matrix 1 is higher and it is not easy to separate. At the same time, the crossing amplitude between the two is increased, so that the concrete can be more embedded between the steel fiber matrix 1 and the forked fiber 2, thereby forming a cross-mixing relationship with the concrete. Compared with the prior art in which only a single steel fiber is bent at the end, the bonding strength between the steel fiber and the concrete is significantly improved.

[0039] The production method of high-bonding steel fiber for concrete comprises the following steps:

[0040] S1. First, the steel is subjected to wire drawing through different dies to obtain two types of steel wires with rectangular and circular cross-sections;

[0041] S2, steel wires with rectangular cross-sections are arranged side by side by brushing with hydrosol, and then cut and segmented according to the target length of the steel fibers to obtain steel sheets, and then both ends of each steel wire on the steel sheet are punched to form an inner limit hole 101 and an outer limit hole 102, and then both ends of the steel sheet are bent three times, and the three bends at both ends are symmetrical to each other;

[0042] S3, a surface increasing sleeve is wound around the steel wire with a circular cross section at a certain interval, the surface increasing sleeve is composed of a plurality of three-dimensional sleeves 3 wrapped front and back, the steel wire with a circular cross section is cut into sections to obtain a plurality of forked fibers 2 with surface increasing sleeves, and both ends of the forked fibers 2 are cut to reduce the diameter of the end portions;

[0043] S4, such as Figure 5 First, one end of the forked fiber 2 is passed through the inner limiting hole 101 and the outer limiting hole 102 on the same side in sequence, then the forked fiber 2 is pressurized to make it arc-shaped, and then the other end of the forked fiber 2 is passed through the inner limiting hole 101 and the outer limiting hole 102 on the other side in sequence, and finally through cleaning and drying treatment, a cross-three-dimensional high-binding strength steel fiber is obtained.

[0044] In the above-mentioned high-bonding strength steel fiber for concrete, on the basis of multiple bending of the steel fiber, a forked fiber 2 matching the steel fiber matrix 1 is also provided. The two can form a cross shape after assembly. When combined with concrete, the concrete will be in cross contact with the steel fiber. Compared with the treatment of only bending, the bonding strength between the steel fiber and the concrete is greatly improved, so that the effect of improving the strength of the concrete is better.

[0045] The second implementation method:

[0046] Based on the first embodiment, this embodiment adds a one-way sticker processing operation, and the rest of the parts are consistent with the first embodiment.

[0047] Figure 6-7 As shown, b in the figure represents a one-way sticker. Before performing step S4, the third bending parts at both ends of the steel sheet are first covered with a one-way sticker. The back of the one-way sticker is fixedly attached with a FiberFix tape. The FiberFix tape will produce super strong viscosity after contacting water, so that it can be stably bonded to the steel fiber matrix 1. When covering the one-way sticker, the multiple protrusions on the one-way sticker are made to face the multiple external limiting holes 102 and penetrate the external limiting holes 102, and then the surface of the one-way sticker is sprayed with water to make the water penetrate into the back of the one-way sticker, so that the one-way sticker and the steel sheet are stably bonded;

[0048] During step S4, after the end of the reduced diameter section 22 is inserted into the protrusion at the outer limiting hole 102, the reduced diameter section 22 squeezes the internal space of the protrusion, causing the cement powder inside to mix with water, while causing the end of the protrusion to increase abnormally. Subsequently, the cement powder is mixed with water and hardened, thereby forming a "stone lump" at the end of the forked fiber 2 through the flat bend section 143, limiting the position of the forked fiber 2 and making it difficult for it to move relative to the steel fiber matrix 1.

[0049] like Figure 7 The one-way patch includes a plurality of membrane sheets 41 bonded in sequence by hydrosol and a plurality of pre-expanded protrusions 42 fixedly connected to the back of the membrane sheets 41, respectively. The membrane sheets 41 are double-layer structures, and a layer of the membrane sheets 41 away from the pre-expanded protrusions 42 is a hard porous structure, and the other layer of the membrane sheets 41 is made of a hard water-absorbent material. When water is sprayed, the water can penetrate along the porous structure to the back and then contact the FiberFix tape, making it sticky, so that the one-way patch can be stably bonded to the steel fiber matrix 1, facilitating the stable formation of the "stone lump" in which the subsequent forked fibers 2 extend to the outer end of the steel fiber matrix 1.

[0050] like Figure 8The pre-expanded protrusion 42 includes a shaping section 421 fixedly connected to the diaphragm 41, an outer sleeve 423 fixedly connected to the outer end of the shaping section 421, and a coating layer 422 fixedly connected to the inner wall of the shaping section 421 near the outer sleeve 423. The outer sleeve 423 is filled with water, the coating layer 422 is filled with cement powder, and the mouth of the shaping section 421 is sealed by an elastic membrane. The outer sleeve 423 is made of highly elastic silicone material, the coating layer 422 is made of a thin sealing material, the shaping section 421 is a hard shaping structure, and the inner diameter of the shaping section 421 is consistent with the reduced diameter section 22. When performing step S4, the reduced diameter section 22 enters the pre-expanded protrusion 42, which will squeeze the cement powder to make it continue to move inward. Figure 9-10 In the figure, a represents a "stone lump". On the one hand, the end of the pre-expanded protrusion 42 is gradually expanded, and at the same time, the thin coating layer 422 will be broken first under the extrusion of the reduced diameter section 22. At this time, water contacts with cement powder and hardens, thereby forming a larger "stone lump" at the end of the reduced diameter section 22, making it difficult to detach from the outer limit hole 102. Compared with the first embodiment, the relative stability between the steel fiber matrix 1 and the forked fiber 2 is greatly improved.

[0051] In summary, on the basis of multiple bending of the steel fibers, forked fibers 2 matching the steel fiber matrix 1 are also provided, and the two can form a cross shape after assembly. When combined with concrete, the concrete will be in cross contact with the steel fibers. Compared with the treatment of only bending, even if the concrete cracks and the steel fibers are stressed, it is difficult to separate the concrete from the crossed steel fibers. The cross structure of the two greatly improves the bonding force between the concrete and the concrete, making the effect of improving the strength of the concrete better. In addition, with the operation of unidirectional pasting, the end of the forked fiber 2 and the steel fiber matrix 1 can be made to form a "stone lump", thereby limiting the position of the forked fiber 2, making it difficult for it to have relative displacement with the steel fiber matrix 1, thereby effectively ensuring the stability of the crossed steel fibers.

[0052] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A high-bonding steel fiber for concrete, characterized in that: The invention comprises a steel fiber matrix (1), forked fibers (2) mutually abutting against the two ends of the steel fiber matrix (1), and a plurality of three-dimensional sleeves (3) uniformly wound around the forked fibers (2), wherein the steel fiber matrix (1) comprises a middle flat section (11), blunt bend sections (141) respectively fixedly connected to the two ends of the middle flat section (11), two inclined sections (12) respectively fixedly connected to the blunt bend sections (141) at one end away from each other, two sharp bend sections (142) respectively fixedly connected to the inclined sections (12) at one end away from each other, and two sharp bend sections (143) respectively fixedly connected to the sharp bend sections (144). 2) a vertical flat section (13) at the lower end and a flat curved section (143) fixedly connected to the ends of the two vertical flat sections (13), the ends of the flat curved sections (143) facing the middle flat section (11), the plurality of three-dimensional sleeves (3) are located between the two inclined sections (12), the inclined sections (12) are provided with inner limiting holes (101), the bent portions of the flat curved sections (143) are provided with outer limiting holes (102), and the two ends of the forked fibers (2) are respectively movable through the two inner limiting holes (101) and inserted into adjacent outer limiting holes (102); The three-dimensional sleeve (3) comprises a spiral section (31) wound around the outside of the forked fiber (2), and an outwardly folded extension section (32) and an end ring (33) respectively fixedly connected to both ends of the spiral section (31); the end ring (33) is simultaneously sleeved on the connection between the spiral section (31) and the outwardly folded extension section (32) of the forked fiber (2) and the adjacent three-dimensional sleeve (3); The forked fiber (2) comprises a large diameter section (21) and two reduced diameter sections (22) respectively fixedly connected to both ends of the large diameter section (21), the reduced diameter sections (22) matching the outer limiting holes (102), and the large diameter section (21) matching the inner limiting holes (101); The production method of high-bonding steel fiber for concrete comprises the following steps: S1. First, the steel is subjected to wire drawing through different dies to obtain two types of steel wires with rectangular and circular cross-sections; S2, steel wires with rectangular cross-sections are arranged side by side by brushing glue, and then cut and segmented according to the target length of the steel fibers to obtain steel sheets, and then both ends of each steel wire on the steel sheet are punched to form an inner limit hole (101) and an outer limit hole (102), and then both ends of the steel sheet are bent three times, and the three bends at both ends are symmetrical to each other; S3, winding a surface increasing sleeve at a certain interval outside the steel wire with a circular cross section, the surface increasing sleeve being composed of a plurality of three-dimensional sleeves (3) bundled and wound in front and behind, cutting the steel wire with a circular cross section into sections to obtain a plurality of forked fibers (2) with the surface increasing sleeves, and cutting the two ends of the forked fibers (2) to reduce the diameter of the end portions; S4, firstly, one end of the forked fiber (2) is passed through the inner limiting hole (101) and the outer limiting hole (102) on the same side in sequence, then the forked fiber (2) is pressurized to make it present an arc shape, then the other end of the forked fiber (2) is passed through the inner limiting hole (101) and the outer limiting hole (102) on the other side in sequence, and finally, it is washed and dried to obtain a cross-three-dimensional high-binding strength steel fiber.

2. The high-bonding steel fiber for concrete according to claim 1, characterized in that: The bending angle of the blunt bend section (141) is 120-150°, the bending angle of the sharp bend section (142) is 30-60°, and the bending angle of the flat bend section (143) is a right angle.

3. The high-bonding steel fiber for concrete according to claim 1, characterized in that: The inner diameter of the inner limiting hole (101) is greater than that of the outer limiting hole (102), and the inner diameter of the outer limiting hole (102) is between the inner diameters of the large diameter section (21) and the reduced diameter section (22); the forked fiber (2) is in a horizontal state when not connected to the steel fiber matrix (1), and the length of the forked fiber (2) is greater than the distance between the two vertical flat sections (13).

4. The high-bonding steel fiber for concrete according to claim 1, characterized in that: Before performing step S4, the third bending parts at both ends of the steel sheet are first covered with a one-way sticker, and the back of the one-way sticker is fixedly attached with a FiberFix tape. When covering the one-way sticker, the plurality of protrusions on the one-way sticker are aligned with the plurality of external limiting holes (102) and penetrate the external limiting holes (102), and then the surface of the one-way sticker is sprayed with water to allow the water to penetrate into the back of the one-way sticker, so that the one-way sticker and the steel sheet are stably bonded; During step S4, after the end of the reduced diameter section (22) is inserted into the protrusion at the outer limiting hole (102), the reduced diameter section (22) squeezes the internal space of the protrusion, causing the cement powder inside to mix with water, while causing the end of the protrusion to increase abnormally. Subsequently, the cement powder mixes with water and hardens, thereby forming a "stone lump" at the end of the bifurcated fiber (2) across the flat bend section (143), limiting the position of the bifurcated fiber (2) and making it difficult for the bifurcated fiber (2) to be displaced relative to the steel fiber matrix (1).

5. The high-bonding steel fiber for concrete according to claim 4, characterized in that: The one-way patch comprises a plurality of membrane sheets (41) bonded in sequence by means of a hydrosol, and a plurality of pre-expanded protrusions (42) respectively fixedly connected to the back of the membrane sheets (41). The membrane sheets (41) are of a double-layer structure, and a layer of the membrane sheet (41) away from the pre-expanded protrusions (42) is of a hard porous structure, and another layer of the membrane sheet (41) is made of a hard water-absorbent material.

6. The high-bonding steel fiber for concrete according to claim 5, characterized in that: The pre-expanded protrusion (42) comprises a shaping section (421) fixedly connected to the diaphragm (41), an outer sleeve (423) fixedly connected to the outer end of the shaping section (421), and a coating layer (422) fixedly connected to the inner wall of the shaping section (421) on one side close to the outer sleeve (423), the outer sleeve (423) is filled with water, the coating layer (422) is filled with cement powder, and the mouth of the shaping section (421) is sealed by an elastic membrane.

7. The high-bonding steel fiber for concrete according to claim 6, characterized in that: The outer sleeve (423) is made of a highly elastic silicone material, the coating layer (422) is made of a thin sealing material, the shaping section (421) is a hard shaping structure, and the inner diameter of the shaping section (421) is consistent with that of the reduced diameter section (22).

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