CN113636771B - Arc-shaped steel fiber, manufacturing mold and method and concrete using steel fiber - Google Patents
Arc-shaped steel fiber, manufacturing mold and method and concrete using steel fiber Download PDFInfo
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- CN113636771B CN113636771B CN202111038710.XA CN202111038710A CN113636771B CN 113636771 B CN113636771 B CN 113636771B CN 202111038710 A CN202111038710 A CN 202111038710A CN 113636771 B CN113636771 B CN 113636771B
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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
- B21F1/00—Bending wire other than coiling; Straightening wire
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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
- B21F1/00—Bending wire other than coiling; Straightening wire
- B21F1/02—Straightening
- B21F1/026—Straightening and cutting
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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
- B21F11/00—Cutting wire
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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
- B21F23/00—Feeding wire in wire-working machines or apparatus
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention provides an arc-shaped steel fiber, which is characterized in that: the arc-shaped steel fiber main body is an arc, in order to improve the anchoring of the fiber in the matrix, anchoring sections can be arranged at two ends of the fiber, each anchoring section can be composed of one or more end hooks which are arranged continuously, and each end hook is composed of an arc section and a straight line section. Aiming at the defects of bridging mechanism and crack inhibition capability of one-dimensional fibers in a matrix, the invention prepares the arc-shaped steel fibers with the characteristics of two-dimensional dimensions, spreads the arc-shaped steel fibers over the whole die in advance, and can form an advantage effect of inhibiting crack expansion of a closed space in the matrix by playing the mutual hooking effect of the arc-shaped steel fibers, the two-time bridging effect on the matrix cracks and the two fibers, thereby improving the inhibition efficiency on crack expansion and greatly improving the basic mechanical property of the infiltrated fiber concrete.
Description
Technical Field
The invention relates to a fiber concrete infiltration casting technology, in particular to an arc-shaped steel fiber, a manufacturing die and a manufacturing method thereof and concrete using the steel fiber.
Background
The preparation process of the infiltrated fiber concrete (Slurry infiltrated fiber concrete, abbreviated as SIFCON) is different from that of the traditional concrete, steel fibers are required to be paved in a mould in advance, the fiber network produced by the process is prepared by infiltration of cement paste (or mortar) after being stirred, the fiber volume ratio can reach 5-20%, and the material has obvious strain hardening performance after being hardened and under tension and compression, and is a high-strength and high-toughness material with very rich prospects, and the material is widely applied to the fields of novel structures, earthquake resistance, protection engineering and the like. The shape of steel fiber used by SIFCON has remarkable influence on mechanical properties, and the traditional steel fiber generally has fibers such as end hooks, straight fibers, wave fibers and the like, the size of the fibers in one direction is far larger than that of the fibers in other directions, belongs to one-dimensional fibers, and mainly plays a role in materials through the bonding between the fibers and a matrix, the friction resistance in the pulling process and the interlocking effect between the fibers. The prior different steel fiber types only regulate and control the geometric parameters on the basis of the prior art, still belong to one-dimensional fiber, do not improve the dimension of the fiber in all directions, have small improvement on the control effect of crack development, and the potential interlocking effect among the fibers is too dependent on the geometric shape of the fiber end and the position relationship among the fibers, so that the fiber type steel fiber has very difficult to play a good crack control effect in all directions, and restricts the further improvement of SIFCON performance to a certain extent.
Chinese patent CN201120344944.2 discloses an end hook type steel fiber, which rolls the steel fiber into a main body structure with a bow shape, and then bends two times at two ends to set an anchoring section, but the main body part is still much larger than other directions, belongs to a "one-dimensional" size fiber, and is difficult to form a closed space by bridging between two fibers in a matrix, so as to inhibit crack development, and the control effect on crack development is limited.
Chinese patent CN200920236174.2 discloses a fine wavy steel fiber, which rolls the steel fiber into a wavy shape, and has peaks and valleys, the size in a single direction is far greater than that of other directions, and the fiber belongs to a fiber with a "one-dimensional" size, and has a good crack bridging effect only in one direction in a matrix, and cannot have a good bridging effect in the other direction.
Disclosure of Invention
In order to solve the technical problems, the invention provides an arc-shaped steel fiber, a manufacturing die and a manufacturing method thereof and concrete using the steel fiber. Aiming at the defects that the bonding performance of a steel fiber-interface and the crack control capability of a one-dimensional fiber are improved, the arc-shaped steel fiber with the characteristic of two-dimensional size is prepared, the arc-shaped steel fiber is paved on the whole die in advance, a closed space is formed in a matrix by utilizing the two fibers through the mutual hooking effect of the arc-shaped steel fiber and the two bridging effect of the arc-shaped steel fiber and the matrix crack, the continuous development of the crack is restrained, the crack development control efficiency is improved, and the basic mechanical property of SIFCON is greatly improved.
The invention provides the following technical scheme:
arc shape steel fiber, its characterized in that: the whole body is formed by a main body arc section only, and an anchoring section is not arranged; or the arc-shaped steel fiber main body is arc, for improving the anchoring between the fiber and the matrix, the two ends of the fiber can be provided with anchoring sections, the anchoring sections can be composed of one or a plurality of end hooks which are arranged continuously, each end hook is composed of an arc section and a straight line section, wherein: the main body part is a middle circular arc section, when the end part is provided with the anchoring section, two ends of the middle circular arc section are respectively bent to form two identical small circular arc sections, and the other end of the small circular arc section is connected with the straight line section to form an end hook.
Preferably, the arc-shaped steel fiber is made of steel wires with tensile strength not lower than 600MPa, the diameter of the steel wires is 0.15 mm-2.00 mm, the length of the steel wires is 20.00 mm-150.00 mm, and the length-diameter ratio is 30-350.
Preferably, the main body arc section tends to be a semicircle, the circle center is an O point, and the change range of the radian theta from the circle center to the two end points of the fiber is 5 pi/6-4 pi/3. When the anchoring section is not arranged, the whole body is only composed of the main body circular arc sections. When the anchoring section is arranged, one or a plurality of continuous end hooks are arranged at two ends, and each end hook consists of a small arc section and a straight line section.
Based on the arc-shaped steel fiber, the invention also provides a infiltration fiber concrete, wherein the concrete comprises the arc-shaped steel fiber.
Based on the infiltration fiber concrete, the invention also provides a preparation method of the infiltration fiber concrete, which comprises the following steps,
1) Spreading the arc-shaped steel fibers over the whole die to form hook connection among a plurality of arc-shaped steel fibers;
2) Injecting cement paste or mortar into the mould to infiltrate and cast fiber concrete.
In addition, the invention also provides a manufacturing die of the arc-shaped steel fiber, which comprises the following components: the device comprises a working platform mechanism for straightening wires to be prepared and a flat plate mechanism for receiving the input of the working platform and performing punch forming on the wires to be prepared.
Preferentially, the first guide holder, the straightening roller, the second guide holder, the feeding roller, the first bearing and the second bearing are sequentially arranged on the working platform mechanism, wherein: the lower end of the feeding roller is connected with a second motor;
the flat plate mechanism is provided with a first clamping seat, a second clamping seat, a clamping groove and a cutting die in sequence;
the wire feeding tube initial section is arranged on the first bearing, and extends to the front of the clamping groove after passing through the second bearing, the first clamping seat and the second clamping seat; wherein: a first motor is arranged between the first bearing and the second bearing, a driving gear is arranged on an output shaft of the first motor, and a driven gear meshed with the driving gear is arranged on the wire feeding tube;
the cutting die comprises a hanging plate structure arranged on a flat plate mechanism, an electric push rod is arranged on the hanging plate structure, a lower die is arranged on a piston of the electric push rod, an upper die matched with the lower die is arranged on the right side of a clamping groove, and the cutting die comprises: the left side of the upper die is provided with a cutting groove; the lower die is provided with a cutter inserted into the cutting groove.
Based on the manufacturing mould, the invention also provides a method for manufacturing the arc-shaped steel fiber, which comprises the following steps,
1) Threading: selecting a wire rod steel wire to be prepared, enabling one end of the wire rod to pass through a channel in a first guide seat, enter between two rows of straightening rollers for straightening the wire rod, then pass through a channel in a second guide seat, then enter between a pair of feeding rollers, and finally penetrate the wire rod into a wire feeding tube;
2) The electric push rod is started to enable the lower die to descend for a certain distance, the second motor is started, the driving feed roller is used for conveying the wire forwards for a specified distance, and the wire passing through the clamping groove is fixed firmly;
3) After the wire rod enters the cutting-off die, the electric push rod is started to push the lower die upwards, the lower die is completely attached to the upper die forming groove, the arc-shaped fiber is formed by stamping, the wire rod is rapidly cut off in the cutting-off groove by utilizing the cutter, after the stamping cutting-off is completed, the force application rod is lowered to the original position, unloading is performed, and the steps are repeated, so that the arc-shaped steel fiber is prepared.
The invention has wide application prospect in engineering practice and has the following advantages:
1. the invention is paved with the whole mould in advance, and then the mould is formed by infiltration of cement paste or mortar, because the main body of the mould is arc-shaped, fibers are mutually hooked in the main body, and the 'biting force' generated by mutual hooking is theoretically far greater than the mechanical biting force generated by the end interlocking effect between the conventional end hooking steel fibers, so that the invention is more difficult to pull out from SIFCON, the mutual hooking between fibers is beneficial to the load transmission to be more distant, and the SIFCON with larger volume participates in stress.
2. The invention belongs to a two-dimensional steel fiber, which can be in a quasi-three-dimensional distribution state in a matrix and has good bonding effect in all directions.
3. The invention belongs to a two-dimensional steel fiber, and compared with the one-dimensional steel fiber which has only one-time bridging to a crack surface, the two-dimensional steel fiber can potentially realize two-time bridging to the crack surface, and the bridging efficiency of the fiber to the crack is enhanced as shown in figure 4.
4. Compared with traditional end hook fibers and other one-dimensional steel fibers, three or more fibers are needed to form a closed space to control crack propagation. The invention with the characteristic of two-dimensional size can form a closed area by only two fibers, namely the invention can bridge the cracks more timely and control the development of the cracks.
Drawings
FIG. 1 is a schematic view of an arcuate steel fiber structure;
FIG. 2 is a diagram of arcuate steel fiber dimensions;
FIG. 3 is a schematic illustration of the hooking effect between arcuate steel fibers;
FIG. 4 is a schematic view of a "two-pass bridging" of arcuate steel fibers to a fracture surface;
FIG. 5 is a schematic diagram of a front view of an arc-shaped steel fiber manufacturing mold;
FIG. 6 is a schematic top view of an arcuate steel fiber forming die;
FIG. 7 is a detail drawing of the arc steel fiber manufacturing die stamping and cutting;
FIG. 8 is a graph showing the results of a conventional end hook steel fiber SIFCON axial compression performance test;
FIG. 9 is a graph showing the results of axial compressive property tests of arcuate steel fibers SIFCON.
Description of the embodiments
As shown in fig. 1 and 2, the arc-shaped steel fiber is made of steel wires, the tensile strength of the steel wires is not lower than 600MPa, the diameter of the steel wires is 0.15 mm-2.00 mm, the length of the steel wires is 20.00 mm-150.00 mm, and the length-diameter ratio is 30-350.
The whole body is formed by a main body arc section only, and an anchoring section is not arranged; or for improving the anchoring between the fiber and the matrix, an anchoring section may be provided at both ends of the fiber, the anchoring section may be composed of one or a plurality of end hooks provided in succession, each end hook being composed of one circular arc section and one straight line section, and the following dimensions and structures are preferable, wherein: the main body part is a middle arc section, the main body arc section tends to be in a semicircular shape, namely, is approximately in a semicircular shape, the circle center is an O point, and the change range of the radian theta from the circle center to two end points of the fiber is 5 pi/6-4 pi/3. When the anchoring section is not arranged, the whole body is only composed of the main body circular arc sections.
When the anchoring section is arranged, two ends of the middle circular arc section are respectively bent to form two small circular arc sections, and the other ends of the small circular arc sections are connected with the straight line sections.
Based on the arc-shaped steel fiber, the invention also provides a infiltration fiber concrete, wherein the concrete comprises the arc-shaped steel fiber.
Based on the infiltration fiber concrete, the invention also provides a preparation method of the infiltration fiber concrete, which comprises the following steps,
1) Spreading the arc-shaped steel fibers over the whole die to form hook connection among a plurality of arc-shaped steel fibers;
2) Injecting cement paste or mortar into the mould to infiltrate and cast fiber concrete. Because the main body is arc-shaped, the fibers are mutually hooked in the matrix, please refer to figure 3, and the 'biting force' generated by the mutual hooking is theoretically far greater than the mechanical biting force generated by the end interlocking effect between the conventional end hooked steel fibers, so that the pulling out of the SIFCON is more difficult, the mutual hooking between the fibers is beneficial to the load transmission to be farther, and the SIFCON with larger volume participates in the stress
In addition, the invention also provides a manufacturing die of the arc-shaped steel fiber, which comprises the following components: the flat plate mechanism 9 is used for carrying out punch forming on the wire rods to be prepared, and is used for receiving the input of the working platform 16.
The first guide holder, the straightening roller 2, the second guide holder, the feeding roller 3, the first bearing and the second bearing are sequentially arranged on the working platform mechanism 16, wherein: the lower end of the feeding roller 3 is connected with a second motor 15; the feed rollers 3 are a pair and comprise a driving roller and a driven roller, wherein the driving roller is driven by a second motor 15, the second motor 15 is arranged below a working platform 16, and the feed rollers 3 are used for driving wires to move forwards. The first guide seat and the second guide seat have the same structure, namely the guide seat 1 in the attached drawings, and the first bearing and the second bearing have the same structure, namely the bearing 4 in the attached drawings. The middle part of the guide seat is provided with an axial passage through which the wire rod can pass.
The flat plate mechanism 9 is provided with a first clamping seat, a second clamping seat, a clamping groove 13 and a cutting die in sequence; the plate mechanism 9 can be erected by a bracket and the working platform mechanism 16 is positioned at the same horizontal position, or can be fixed on a side wall in other manners and positioned at the same horizontal position with the working platform mechanism 16. The first card seat and the second card seat have the same structure, and the card seats 8 are all shown in the drawing of the specification. The first clamping seat and the second clamping seat are fixedly arranged on the flat plate mechanism 9 through bolts, and the second clamping seat is also provided with a connecting block which is connected with the clamping groove 13 to help stability.
The initial section of the wire feeding tube 7 is arranged on the first bearing, and extends to the front of the clamping groove 13 after passing through the second bearing, the first clamping seat and the second clamping seat; wherein: a first motor 5 is arranged between the first bearing and the second bearing, a driving gear 6 is arranged on an output shaft of the first motor 5, and a driven gear meshed with the driving gear 6 is arranged on the wire feeding pipe 7; the first motor 5 drives the driving gear 6 to move to drive the driven gear to move, the wire feeding pipe 7 is driven to rotate, and the wire feeding pipe 7 is used for manufacturing the three-dimensional steel fiber, so that redundant description is omitted.
The cutting die comprises a hanging plate structure 121 mounted on the plate mechanism 9, and the hanging plate structure 121 can be fixed on the plate mechanism 9 through bolts. The electric putter 14 is installed on link plate structure 121, install lower mould 12 on the piston of electric putter 14, the right side of draw-in groove 13 install with lower mould 12 matched with go up the mould, go up the mode of being connected of mould and connecting block and also be fixed through bolted connection, wherein: the left side of the upper die is provided with a cutting groove 10; the lower die 12 is provided with a cutter 11 inserted into the cutoff groove 10. The frequency of the back and forth movement of the electric putter 14 is set by the actual production needs.
Based on the manufacturing mould, the invention also provides a preparation method of the arc-shaped steel fiber, which comprises the following steps,
1) Threading: selecting a wire rod steel wire to be prepared, enabling one end of the wire rod to pass through a channel in a first guide seat, enter between two rows of straightening rollers 2 for straightening the wire rod, then pass through a channel in a second guide seat, then enter between a pair of feeding rollers 3, and finally penetrate the wire rod into a feeding tube 7;
2) The electric push rod 14 is started to enable the lower die 12 to descend for a certain distance, the second motor 15 is started to drive the feeding roller 3 to forward convey the wire rod for a specified distance, and after the wire rod passes through the wire feeding tube 7, the wire rod passing through the wire rod is fixed firmly by the clamping groove 13; a pair of feeding rollers 3 are connected with a second motor 15 for driving and rotating the wire rod to advance
3) After the wire enters the cutting die, the electric push rod 14 is started to push the lower die 12 upwards, the lower die 12 is completely attached to the upper die forming groove, the arc-shaped fiber is formed by stamping, the wire is rapidly cut off in the cutting groove 10 by using the cutter 11, after the stamping and cutting are completed, the force application rod is lowered to the original position for discharging, and the steps are repeated, so that the arc-shaped steel fiber is prepared.
The cutting die shape of the front end fiber is processed and molded in advance and is matched with the size data of the arc-shaped steel fiber required by the application.
Example 1
A steel wire with nominal tensile strength of 1100MPa, diameter of 0.55mm and length of 44.00mm is adopted, the steel wire is prepared according to the steps, an anchoring section is arranged, wherein the radius R1 of the circular arc section is 10.00mm, the radius R2 of the small circular arc section is 4.50mm, the length L2 of the straight line section is 2.48mm, the radian theta from the circle center 0 point to two end points of the fiber is 5 pi/4, the straight line distance L1 between two ends of the fiber is 25.53mm, and the length-diameter ratio of the steel fiber is 80.
Example 2
A steel wire with nominal tensile strength of 600MPa, diameter of 0.50mm and length of 31.00mm is adopted, the steel wire is prepared according to the steps, an anchoring section is arranged, wherein the radius R1 of the circular arc section is 7.00mm, the radius R2 of the small circular arc section is 2.55mm, the length L2 of the straight line section is 2.15mm, the radian theta from the circle center 0 point to two end points of the fiber is 4 pi/3, the straight line distance L1 between two ends of the fiber is 15.21mm, and the length-diameter ratio of the steel fiber is 62.
Example 3
A steel wire with nominal tensile strength of 1100MPa, diameter of 0.20mm and length of 21.00mm is adopted, and is prepared according to the steps, an anchoring section is not arranged, wherein the radius R1 of the circular arc section is 7.60mm, the radian theta from the center of a circle 0 point to two end points of the fiber is 5 pi/6, the straight line distance L1 between the two ends of the fiber is 14.84mm, and the length-diameter ratio of the steel fiber is 105.
Example 4
A steel wire with nominal tensile strength of 2000MPa, diameter of 0.20mm and length of 34.00mm is adopted, the steel wire is prepared according to the steps, an anchoring section is arranged, wherein the radius R1 of the circular arc section is 8.00mm, the radius R2 of the small circular arc section is 2.36mm, the length L2 of the straight line section is 1.87mm, the radian theta from the center of a circle 0 point to two end points of the fiber is 11 pi/9, the straight line distance L1 between two ends of the fiber is 19.98mm, and the length-diameter ratio of the steel fiber is 170.
Comparing the difference of the mechanical properties of the concrete between the sample of the example 1 and the standard sample doped with the common end hook steel fiber, the following conclusion is obtained:
table 1 concrete mix list:
| sequence number | Cement (g) | Fly ash (g) | Silica fume (g) | Fine sand (g) | Water (g) | Water reducer (g) | Common steel fibre (g) | Arc shaped steel fiber (g) |
| 1 | 1178.63 | 497.82 | 82.97 | 1759.43 | 497.82 | 8.94 | 2058 | 0 |
| 2 | 1178.63 | 497.82 | 82.97 | 1759.43 | 497.82 | 8.94 | 0 | 2058 |
And after the concrete is well prepared, placing the concrete into a labeling curing box for curing for 28 days, and testing the axial pressure performance by using an electrohydraulic servo universal testing machine.
The test result shows that under the condition that the fiber material, the fiber slenderness ratio and the matrix proportion are the same, the arc-shaped steel fiber is used for replacing the common end hook steel fiber, the compressive strength of the corresponding SIFCON is improved by 83%, the compressive strain corresponding to the peak stress is improved by 45%, and particularly as shown in fig. 8 and 9, the axial compression performance of the concrete is greatly improved.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The preparation method of the infiltration fiber concrete is characterized by comprising the following steps: the steel fiber comprises arc-shaped steel fibers, wherein the whole arc-shaped steel fibers only comprise main circular arc sections, and no anchoring section is arranged; or (b)
The arc-shaped steel fiber main body is an arc, and anchoring sections are arranged at two ends of the fiber; wherein:
the anchoring section may be composed of one or a plurality of end hooks arranged in succession, each end hook being composed of an arc section and a straight line section, wherein: the main body part is a middle circular arc section, when the end part is provided with the anchoring section, two ends of the middle circular arc section are respectively bent to form two identical small circular arc sections, and the other end of the small circular arc section is connected with the straight line section to form an end hook;
the main body arc section tends to be a semicircle, the circle center is an O point, and the change range of the radian theta from the circle center to the two end points of the fiber is 5 pi/6-4 pi/3;
the preparation method comprises the following steps,
1) Spreading the arc-shaped steel fibers over the whole die to form hook connection among a plurality of arc-shaped steel fibers; forming a closed space in the matrix by using two fibers;
2) Injecting cement paste or mortar into the mould to infiltrate and cast fiber concrete.
2. The method for preparing the infiltrated fiber concrete according to claim 1, wherein the method comprises the following steps: the arc-shaped steel fiber is made of steel wires with tensile strength not lower than 600MPa, the diameter of the steel wires is 0.15-2.00 mm, the length of the steel wires is 20.00-150.00 mm, and the length-diameter ratio is 30-350.
3. The infiltration fiber concrete is characterized in that: the infiltrated fiber concrete is prepared by the method for preparing the infiltrated fiber concrete of any one of claims 1 or 2.
4. A manufacturing die for manufacturing the arc-shaped steel fiber as set forth in claim 1, comprising: the flat plate mechanism (9) is used for carrying out stamping forming on the wire rod to be prepared, and is used for receiving the input of the working platform mechanism (16); the working platform mechanism (16) is provided with a first guide seat, a straightening roller (2), a second guide seat, a feeding roller (3), a first bearing and a second bearing in sequence, wherein: the lower end of the feeding roller (3) is connected with a second motor (15);
the flat plate mechanism (9) is provided with a first clamping seat, a second clamping seat, a clamping groove (13) and a cutting die in sequence;
the initial section of the wire feeding pipe (7) is arranged on the first bearing, and extends to the front of the clamping groove (13) after passing through the second bearing, the first clamping seat and the second clamping seat; wherein: a first motor (5) is arranged between the first bearing and the second bearing, a driving gear (6) is arranged on an output shaft of the first motor (5), and a driven gear meshed with the driving gear (6) is arranged on the wire feeding pipe (7);
the cutting die comprises a hanging plate structure (121) arranged on a flat plate mechanism (9), an electric push rod (14) is arranged on the hanging plate structure (121), a lower die (12) is arranged on a piston of the electric push rod (14), and an upper die matched with the lower die (12) is arranged on the right side of a clamping groove (13), wherein: the left side of the upper die is provided with a cutting groove (10); the lower die (12) is provided with a cutter (11) inserted into the cutting groove (10).
5. A method of making arc-shaped steel fibers using the making die of claim 4, characterized by: comprises the following steps of the method,
1) Threading: selecting a wire rod steel wire to be prepared, enabling one end of the wire rod to pass through a channel in a first guide seat, entering between two rows of straightening rollers (2) for straightening the wire rod, then passing through a channel in a second guide seat, then entering between a pair of feeding rollers (3), and finally penetrating the wire rod into a wire feeding tube (7);
2) The electric push rod (14) is started to enable the lower die (12) to descend for a certain distance, the second motor (15) is started, the feeding roller (3) is driven to convey the wire rod forwards for a designated distance, and the clamping groove (13) is utilized to fix the penetrated wire rod firmly;
3) After the wire enters the cutting die, an electric push rod (14) is started to push the lower die (12) upwards, the lower die (12) is completely attached to the upper die forming groove, the arc-shaped fiber is formed by stamping, the wire is rapidly cut off in the cutting groove (10) by using a cutter (11), after the stamping and cutting are completed, the force application rod is lowered to the original position for unloading, and the steps are repeated, so that the arc-shaped steel fiber is prepared.
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| CN113636771B true CN113636771B (en) | 2023-04-28 |
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