Steel fiber

Abstract

The utility model relates to a steel fiber which comprises a reinforcing section which is of a spiral rod-shaped structure on the whole. The reinforcing part extends in the length direction of the outer surface of the reinforcing section; the anchoring ends are arranged at the two ends of the reinforcing section, when the steel fiber is actually used, the whole reinforcing section is in a spiral rod shape and is similar to a spring, the axial length of the steel fiber can be remarkably increased, and then the surface area of the steel fiber can be remarkably increased; the reinforcing part is arranged in the extending direction of the outer surface of the reinforcing section, the surface area of the reinforcing section can be further expanded, the anchoring ends at the two ends of the reinforcing section are matched, the bonding surface area of the steel fiber and the concrete can be further enhanced, and therefore the bonding strength between the steel fiber and the concrete can be further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of building materials, in particular to a steel fiber. 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 and the formation of macro cracks in concrete caused by shrinkage and plastic deformation, significantly improving the tensile, bending, impact and fatigue resistance of concrete, and having good ductility, toughness and durability. Therefore, steel fiber concrete, as an important modified concrete, is playing an increasingly important role in engineering practice.

[0003] Fiber spacing theory, composite material theory and a large number of experimental studies have shown that the strengthening and toughening effect of steel fibers on concrete mainly depends on the strength of the concrete matrix, the aspect ratio of the steel fibers, and the distribution and orientation of the fibers in the matrix. When steel fiber concrete is damaged, most of the steel fibers are pulled out rather than broken. 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, the commonly used steel fibers at home and abroad mainly include straight steel fibers, pressed edge steel fibers, corrugated steel fibers, hook-shaped steel fibers, big-head steel fibers, double-pointed steel fibers, bundled steel fibers, spiral steel fibers, etc. The Chinese patent number is: 201711234589.1, and the name is: an end-anchor type spiral steel fiber and its manufacturing and processing method, including an intermediate section and anchoring ends arranged at both ends of the intermediate section, the anchoring ends are connected to the intermediate section through a smooth transition section, the intermediate section, the anchoring end and the smooth transition section are integrally formed by the same steel wire, and the intermediate section is in a screw shape, which is formed by spirally twisting the steel wire after flattening it into a sheet body with a waist-shaped cross section. Therefore, when the above-mentioned intermediate section is combined with concrete, the bonding strength between the intermediate section and the concrete mainly depends on the bonding area of ​​the spiral body of the intermediate section with the concrete, but the bonding strength between the steel fiber and the concrete still depends on the area of ​​the outer surface of the steel fiber. In the case of equal length, the problem of low bonding strength between the steel fiber and the concrete disclosed in the patent still exists. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a steel fiber that can further increase the bonding surface area between the steel fiber and concrete, so as to further enhance the bonding strength between the steel fiber and concrete.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model proposes

[0006] A steel fiber comprising

[0007] The reinforcement section is in the shape of a spiral rod as a whole;

[0008] The reinforcement portion is arranged to extend along the length direction of the outer surface of the reinforcement section;

[0009] The anchoring ends are arranged at both ends of the reinforcement section.

[0010] In one embodiment of the present invention, the anchoring end is in the shape of a stepped shaft as a whole, and a spiral groove is provided on the outer surface.

[0011] In one embodiment of the present invention, the groove is composed of a thread groove, and the thread is arranged along the extension direction of the outer surface of the reinforcement section.

[0012] In one embodiment of the present invention, the grooves are formed by notches opened on the outer surface of the reinforcement segment, and the grooves are arranged at intervals along the circumferential direction of the reinforcement segment and at intervals along the extension direction of the reinforcement segment.

[0013] In one embodiment of the present invention, the reinforcement portion is composed of protrusions provided on the outer surface of the reinforcement segment, and the reinforcement portions are arranged at intervals along the circumferential direction of the reinforcement segment and at intervals along the extension direction of the reinforcement segment.

[0014] In one embodiment of the utility model, the anchoring end is in the shape of a truncated cone with one end being large and the other end being small, and the fixing end of the anchoring end and the reinforcement section is a small-sized end.

[0015] In one embodiment of the present invention, the large-sized end of the anchoring end is provided with an extension screw.

[0016] In one embodiment of the present invention, the anchoring end is in a pyramid shape as a whole, and the fixing end of the anchoring end and the reinforcement section is a small-sized end.

[0017] In one embodiment of the present invention, the length of the reinforcement section is 35 mm to 45 mm.

[0018] In one embodiment of the present invention, the pitch of the reinforcement section is 15 mm to 20 mm.

[0019] In one embodiment of the present invention, the diameter of the reinforcement section is 8 mm to 10 mm.

[0020] By adopting the above technical scheme, the technical effect of the utility model is that: when the steel fiber is actually used, the reinforcement section is in the shape of a spiral rod as a whole, similar to a spring, which can significantly increase the axial length of the steel fiber, and thus significantly increase the surface area of ​​the steel fiber. By providing a reinforcement portion on the surface of the reinforcement section, and the reinforcement portion is arranged along the extension direction of the outer surface of the reinforcement section, the surface area of ​​the reinforcement section can be further expanded. In combination with the anchoring ends at both ends of the reinforcement section, the combined surface area of ​​the steel fiber and the concrete can be further enhanced, thereby further enhancing the bonding strength between the steel fiber and the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 and Figure 2 Two perspective structural views of the steel fiber in the first embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the steel fiber in the second embodiment of the utility model;

[0024] Figure 4 This is a front view of the steel fiber in the first embodiment of the utility model;

[0025] Figure 5 This is a front view of the steel fiber in the third embodiment of the utility model;

[0026] Figure 6 This is a front view of the steel fiber in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] See also Figure 1 and Figure 2 The steel fiber disclosed in the utility model aims to solve the problem that the existing steel fiber has a limited bonding area with concrete, which makes the bonding strength between the steel fiber and concrete limited. The steel fiber includes a reinforcement section 10, which is in the shape of a spiral rod as a whole; a reinforcement part 11, which is extended along the length direction of the outer surface of the reinforcement section 10; and an anchoring end 20, which is arranged at both ends of the reinforcement section 10.

[0030] In one embodiment, the reinforcement segment 10 is in the shape of a spiral rod as a whole, so that the entire reinforcement segment 10 presents a spring-like structure, which can significantly increase the axial length of the steel fiber, and thus significantly increase the surface area of ​​the steel fiber. By providing a reinforcement portion 11 on the surface of the reinforcement segment 10, and the reinforcement portion 11 is arranged along the extension direction of the outer surface of the reinforcement segment 10, the surface area of ​​the reinforcement segment 10 can be further expanded. In combination with the anchoring ends 20 at both ends of the reinforcement segment 10, the bonding surface area between the steel fiber and the concrete can be further enhanced.

[0031] In one embodiment, the reinforcing section 10 is spring-shaped, and in the area enclosed between the spring center tubes of the reinforcing section 10, the bonding strength between the entire steel fiber and concrete can be further enhanced to prevent the steel fiber from being pulled out when the fiber concrete is damaged.

[0032] In one embodiment of the present invention, refer to Figure 1 , Figure 2 and Figure 3 In order to further enhance the bonding strength between the steel fiber and the concrete, the anchoring end 20 is in the shape of a stepped shaft as a whole, and a spiral groove 21 is provided on the outer surface.

[0033] In one embodiment, the structure between the anchoring end 20 and the spiral groove 21 can significantly increase the surface area of ​​the steel fiber, thereby further enhancing the bonding strength between the steel fiber and concrete and improving the shear resistance of the component.

[0034] In some embodiments, see Figure 3 The reinforcement portion 11 is composed of a thread groove, and the thread is arranged along the extension direction of the outer surface of the reinforcement section 10.

[0035] In one embodiment, the reinforcement portion 11 is a thread groove and is extended along the surface of the reinforcement segment 10, so as to further increase the surface area of ​​the reinforcement segment 10. The pitch of the thread groove is set as small as possible to further release the surface area of ​​the reinforcement segment 10.

[0036] In another implementation, see Figure 1 and Figure 2 The reinforcement part 11 is composed of a notch opened on the outer surface of the reinforcement section 10 , and the reinforcement parts 11 are arranged at intervals along the circumferential direction of the reinforcement section 10 and at intervals along the extension direction of the reinforcement section 10 .

[0037] In one embodiment, the notches are intermittently arranged on the outer surface of the reinforcement segment 10, so that a dense groove area is formed on the outer surface of the reinforcement segment 10, thereby significantly increasing the actual surface of the reinforcement segment 10 to further enhance the bonding strength between the steel fiber and the concrete.

[0038] In one embodiment, the reinforcement parts 11 are composed of protrusions provided on the outer surface of the reinforcement segment 10 , and the reinforcement parts 11 are arranged at intervals along the circumferential direction of the reinforcement segment 10 and along the extension direction of the reinforcement segment 10 .

[0039] In one embodiment, see Figure 6 The anchor end 20 is in the shape of a truncated cone with one end being large and the other end being small, and the fixed end of the anchor end 20 and the reinforcement section 10 is the small-sized end.

[0040] In one embodiment, see Figure 6 In order to further increase the surface area of ​​the entire steel fiber, an extension screw 22 is provided at the large-sized end of the anchoring end 20 .

[0041] In another implementation, see Figure 5 The anchoring end 20 is in a pyramid shape as a whole, and the fixing end of the anchoring end 20 and the reinforcing section 10 is a small-sized end.

[0042] In one embodiment, the length of the reinforcement segment 10 is 35 mm to 45 mm, and the length of the reinforcement segment 10 refers to the length of the spring-shaped spring formed by the reinforcement segment 10, preferably 40 mm.

[0043] In one embodiment, the pitch of the reinforcement section 10 is 15 mm to 20 mm, preferably 18 mm.

[0044] In one embodiment, the diameter of the reinforcement section 10 is 8 mm to 10 mm, preferably 10 mm.

[0045] In short, when the steel fiber is actually used, the reinforcement section 10 is in the shape of a spiral rod as a whole, similar to a spring, which can significantly increase the axial length of the steel fiber, and thus significantly increase the surface area of ​​the steel fiber. By providing a reinforcement portion 11 on the surface of the reinforcement section 10, and the reinforcement portion 11 is arranged along the extension direction of the outer surface of the reinforcement section 10, the surface area of ​​the reinforcement section 10 can be further expanded. In combination with the anchoring ends 20 at both ends of the reinforcement section 10, the combined surface area of ​​the steel fiber and the concrete can be further enhanced, thereby further enhancing the bonding strength between the steel fiber and the concrete.

[0046] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the utility model, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0047] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the other technical features will not be described in detail here.

Claims

1. A steel fiber, characterized in that: include The reinforcing section (10) is in the shape of a spiral rod as a whole; A reinforcement portion (11) extending along the length direction of the outer surface of the reinforcement section (10); Anchoring ends (20) are arranged at both ends of the reinforcement section (10); The anchoring end (20) is in the shape of a stepped shaft as a whole, and a spiral groove (21) is provided on the outer surface; The threads are arranged along an extension direction of the outer surface of the reinforcement section (10); The reinforcement portion (11) is formed by a notch formed on the outer surface of the reinforcement segment (10); the reinforcement portions (11) are arranged at intervals along the circumferential direction of the reinforcement segment (10), and are arranged at intervals along the extension direction of the reinforcement segment (10); The reinforcement portion (11) is composed of protrusions provided on the outer surface of the reinforcement segment (10); the reinforcement portions (11) are arranged at intervals along the circumferential direction of the reinforcement segment (10) and are arranged at intervals along the extension direction of the reinforcement segment (10); The anchor end (20) is in the shape of a truncated cone with one end being large and the other end being small, and the fixed end of the anchor end (20) and the reinforcement section (10) is a small-sized end, and the large-sized end of the anchor end (20) is provided with an extension screw (22); The anchoring end (20) is in the shape of a pyramid as a whole, and the fixing end of the anchoring end (20) and the reinforcement section (10) are small-sized ends.

2. The steel fiber according to claim 1, characterized in that: The length of the reinforcement section (10) is 35 mm to 45 mm.

3. The steel fiber according to claim 1, characterized in that: The pitch of the reinforcement section (10) is 15 mm to 20 mm.

4. The steel fiber according to claim 1, characterized in that: The diameter of the reinforcement section (10) is 8 mm to 10 mm.

Images