CN113754332A - Three-dimensional steel fiber, manufacturing mold and method and concrete applying three-dimensional steel fiber - Google Patents
Three-dimensional steel fiber, manufacturing mold and method and concrete applying three-dimensional steel fiber Download PDFInfo
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- CN113754332A CN113754332A CN202111038704.4A CN202111038704A CN113754332A CN 113754332 A CN113754332 A CN 113754332A CN 202111038704 A CN202111038704 A CN 202111038704A CN 113754332 A CN113754332 A CN 113754332A
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- 239000000835 fiber Substances 0.000 title claims abstract description 104
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004567 concrete Substances 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000004873 anchoring Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000005452 bending Methods 0.000 claims description 120
- 230000007246 mechanism Effects 0.000 claims description 24
- 238000009434 installation Methods 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000011210 fiber-reinforced concrete Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
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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
-
- 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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Abstract
The invention provides a three-dimensional steel fiber, which is characterized in that: the three-dimensional steel fiber is composed of a plurality of circular arc sections and straight line sections, wherein: the straight line segment in the X-axis direction is respectively connected with the straight line segments in the Y-axis direction and the Z-axis direction through two circular arc segments to form a main body part; in order to improve the anchoring of the fiber in the matrix, anchoring sections can be arranged at two ends of the fiber, and each anchoring section can be composed of one or more continuously arranged end hooks, and each end hook is composed of a large circular arc section and a straight line section. The invention is the steel fiber with three-dimensional size, no matter how the feeding process is adopted, the steel fiber can effectively form three-dimensional distribution in the die, and the SIFCON prepared by the method can play a good role in resisting no matter which direction the SIFCON is stretched or compressed, thereby obviously improving the bonding strength with the matrix and greatly improving the mechanical property and the elastic shock wave resisting capability of the SIFCON.
Description
Technical Field
The invention relates to a seepage casting fiber concrete technology, in particular to a three-dimensional steel fiber, a manufacturing mold and a manufacturing method thereof and concrete applying the three-dimensional steel fiber.
Background
Infiltration-cast fiber concrete (SIFCON) is a special type of fiber-reinforced concrete, having an independent fiber matrix, giving the composite matrix important tensile properties, and due to its high fiber content, unique ductility and energy absorption properties. Although SIFCON is very costly because it requires a large amount of steel fibers, it is more widely used around the world, especially in explosive and ballistic structures. In general, conventional fiber reinforced concrete contains 1-2% by volume of fiber, and if the fiber exceeds 2% by volume, it may cause fiber clumping, but rather reduce the performance of the material, whereas SIFCON may be made to contain 4-20% by volume of fiber because the matrix of SIFCON is an aggregate concrete grout or flowing mortar, which is different from that used in fiber reinforced concrete, which is produced by adding fiber to fresh concrete, and SIFCON is produced by infiltrating steel fiber that is previously placed and closely packed in a mold with cement grout. Conventional steel fibers are usually end-hooked, straight, wavy, etc. and these fibers play a role in the material mainly through the bonding between the fibers and the matrix, the frictional resistance during extraction, and the "interlocking" effect between fibers, which is considered to be the main reason for SIFCON to obtain excellent performance.
The existing different steel fiber types are larger than other directions in size, belong to one-dimensional fibers, can play a better 'bridging' role through a specific feeding process, are only distributed in two dimensions in a mold, cannot effectively resist elastic shock waves in a third direction, and do not fully exert the advantages of SIFCON to a certain extent in projects such as protection and the like. Secondly, although some three-dimensional steel fibers are available today, the three-dimensional steel fibers are not applied to SIFCON, and only applied to steel fiber reinforced concrete, another problem is caused, and the steel fiber reinforced concrete can destroy the form of the three-dimensional steel fibers during stirring, so that the advantages of the three-dimensional steel fibers cannot be exerted, and therefore, the utilization and development of the three-dimensional steel fibers are not much, and the development of the SIFCON is limited to a certain extent.
Chinese patent CN201420291784.3 discloses a three-dimensional steel fiber, which is made by bending a steel fiber for multiple times, wherein the second section and the first section are not in the same plane after bending, and the end hooks are for increasing the end anchoring, but because the length of the straight section is 2/3 of the total length of the steel fiber, the projection length of the fiber in other directions is far shorter than that of the straight section, and the bridging effect between the fibers is limited.
Disclosure of Invention
In order to solve the technical problems, the invention provides three-dimensional steel fibers, a manufacturing mold and a manufacturing method thereof, and concrete applying the three-dimensional steel fibers. Aiming at the defects of the existing steel fiber in resisting elastic shock wave performance and destroying form in the fiber stirring process, the invention prepares the steel fiber with three-dimensional size characteristic under the condition of not changing material parameters and slenderness ratio, the steel fiber can generate ideal three-dimensional distribution in a die by any feeding process to play a better bridging role, can resist the elastic shock wave in each direction, simultaneously avoids destroying the fiber form due to stirring, and greatly improves the mechanical property of SIFCO.
The invention provides the following technical scheme:
the three-dimensional steel fiber consists of a plurality of circular arc sections and straight line sections, wherein the straight line section 1 is arranged in the X-axis direction, the straight line section 2 is arranged in the Y-axis direction, and the straight line section 3 is arranged in the Z-axis direction; the straight line section 1 is connected with the straight line section 2 through an arc section 4, and the straight line section 1 is connected with the straight line section 3 through an arc section 6 to form a main body part;
the two ends of the fiber are not provided with anchoring sections; or the two ends of the fiber are provided with anchoring sections;
wherein: the anchoring section can be composed of one or more end hooks arranged continuously, each end hook is composed of a large circular arc section and a straight line section, wherein: the large arc section 5 is formed by bending two small arcs in opposite directions, and the other end of the large arc section 5 is connected with the straight line section 7 to form an end hook; the large arc section 8 is formed by bending two small arcs in opposite directions, and the other end of the large arc section 8 is connected with the straight line section 9 to form an end hook.
Preferably, the three-dimensional steel fiber is prepared from steel wires with tensile strength not lower than 600MPa, the diameter of the steel wires is 0.15-2.0 mm, the length of the steel wires is 30.0-200.0 mm, and the length-diameter ratio is 40-450.
Preferably, the ratio of the projection lengths of the three-dimensional steel fibers in the X, Y, Z three directions is 1.0:0.5: 0.5-1.0: 1.5: 1.5.
Preferentially, the angle between the circular arc section 4 and the circular arc section 6 is pi/4-pi/2; the angle of the two small arcs of the large arc section 5 and the large arc section 8 is pi/6-pi/3.
Based on the three-dimensional steel fiber, the invention also provides infiltration-cast fiber concrete which comprises the three-dimensional steel fiber with the structure.
Based on the three-dimensional steel fiber structure, the invention also provides a manufacturing die of the three-dimensional steel fiber, which is characterized by comprising the following steps: the wire bending machine comprises a working platform mechanism for straightening a wire to be prepared and a flat plate mechanism for receiving the wire to be prepared input by the working platform and bending and forming the wire to be prepared.
Preferentially, install first guide holder, alignment gyro wheel, second guide holder in order above the work platform mechanism, give gyro wheel 3, first bearing, second bearing, wherein: the lower end of the feeding roller 3 is connected with a second motor;
the flat plate mechanism is sequentially provided with a first clamping seat, a second clamping seat, a force application rod for bending and a driving gear for bending; the bending driving gear is driven to rotate by a third motor arranged below the flat plate mechanism, and a bending driven gear meshed with the bending driving gear is further mounted on the flat plate mechanism;
a hanging plate structure is mounted on one side of the driven gear for bending, a force application rod mounting channel is mounted on the hanging plate structure, and an electric push rod is mounted below the force application rod mounting channel; the force application rod installation channel penetrates through the driven gear for bending, and a force application rod for bending connected with the electric push rod is installed in the force application rod installation channel;
the initial section of the wire feeding pipe is arranged on the first bearing and extends to reach the front of the force applying rod for bending 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 pipe; the upper parts of the first clamping seat and the second clamping seat clamp the wire feeding pipe.
Based on the manufacturing mould, the invention also provides a method for manufacturing the three-dimensional steel fiber, which comprises the following steps,
1) threading: selecting a straight wire to be prepared, enabling one end of the wire to pass through a channel in a first guide seat, enabling the wire to enter between two rows of straightening rollers for wire straightening, then passing through a channel in a second guide seat, enabling the wire to enter between a pair of feeding rollers, and finally enabling the wire to pass through a wire feeding pipe;
2) starting an electric push rod to enable a force application rod for bending to descend for a certain distance, and starting a third motor to drive a driving gear for bending to rotate to drive a driven gear for bending to rotate to one side, so that the force application rod for bending is not located right in front of the tail end of the wire feeding pipe; the purpose of this step of operation is: the wire is not prevented from penetrating out of the tail end of the wire feeding pipe;
3) starting a second motor, driving a feeding roller to convey the wire forward for a certain distance;
4) starting an electric push rod to push out the force application rod for bending upwards, then starting a third motor to drive the driven gear for bending to rotate for a set angle, the driven gear for bending can simultaneously drive the force application rod for bending to rotate, the force application rod for bending can push against the wire rod in the rotating process to bend the wire rod for the set angle, and the third step and the fourth step are repeated to bend the wire rod for various angles in the horizontal plane, wherein at the moment, the bending of each angle in the horizontal plane is finished;
5) the first motor is started to drive the driving gear to rotate, namely, the wire feeding pipe is driven to rotate, so that the flat plate mechanism, the bending driving gear, the bending driven gear, the bending force application rod and the electric push rod are turned, but the wire is not turned, so that the wire can be bent in other non-horizontal planes, and a three-dimensional wire is formed;
6) in the working process, the force applying rod for bending needs to be lowered and reset every time bending is finished, so that the wire is prevented from being output from the wire feeding pipe.
Due to the adoption of the design of the structure, the invention has the following beneficial effects:
1. the invention is paved in advance on the whole mould, then the mould is formed by infiltrating and casting the cement paste (or mortar), the fiber is not stirred, and compared with the common steel fiber concrete, the shape change caused by stirring is avoided.
2. The invention is the steel fiber with three-dimensional size, no matter how the feeding process is adopted, the steel fiber can effectively form three-dimensional distribution in the die, and the SIFCON prepared by the method can play a good role in resisting no matter which direction the SIFCON is stretched or compressed, thereby obviously improving the bonding strength with the matrix and greatly improving the mechanical property and the elastic shock wave resisting capability of the SIFCON.
3. Compared with the existing steel fiber which has a better bridging effect in a certain direction, the three-dimensional steel fiber can realize good bridging in all directions, and the bridging among the fibers is utilized to control the development of cracks, so that the risk of cracking of concrete is reduced.
Drawings
FIG. 1 is a schematic representation of a three-dimensional steel fiber structure;
FIG. 2 is a three-dimensional steel fiber size diagram;
FIG. 3 is a schematic structural diagram of a three-dimensional steel fiber bending device in a front view;
FIG. 4 is a schematic top view of a three-dimensional steel fiber bending apparatus;
FIG. 5 shows the results of SIFCON axial compression performance of the common hook steel fiber;
FIG. 6 shows the results of the three-dimensional steel fiber SIFCON in different directions on the compression resistance.
Detailed Description
As shown in fig. 1, the three-dimensional steel fiber is composed of a plurality of circular arc segments and straight line segments, wherein the straight line segment 1 is in the X-axis direction, the straight line segment 2 is in the Y-axis direction, and the straight line segment 3 is in the Z-axis direction; the straight line section 1 is connected with the straight line section 2 through an arc section 4, the straight line section 1 is connected with the straight line section 3 through an arc section 6 to form a main body part, and an anchoring section is not arranged; or the main part is unchanged, in order to improve the anchoring between the fiber and the matrix, anchoring sections can be arranged at two ends of the fiber, the anchoring sections can be composed of one or more continuously arranged end hooks, each end hook is composed of a large circular arc section and a straight line section, wherein: the large arc section 5 is formed by bending two small arcs in opposite directions, and the other end of the large arc section 5 is connected with the straight line section 7 to form an end hook; the large arc section 8 is formed by bending two small arcs in opposite directions, and the other end of the large arc section 8 is connected with the straight line section 9 to form an end hook. The projection length ratio of the three-dimensional steel fibers in the X, Y, Z three directions is 1.0:0.5: 0.5-1.0: 1.5: 1.5.
The method for preparing the three-dimensional steel fiber adopts the steel wire with the tensile strength not lower than 600MPa, the diameter of the steel wire is 0.15-2.0 mm, the length of the steel wire is 30.0-200.0 mm, and the length-diameter ratio is 40-450.
The angle between the circular arc section 4 and the circular arc section 6 is pi/4-pi/2; the angle of the two small arcs of the large arc section 5 and the large arc section 8 is pi/6-pi/3.
Based on the three-dimensional steel fiber, the invention also provides infiltration-cast fiber concrete which comprises the three-dimensional steel fiber with the structure.
Based on the three-dimensional steel fiber structure, the invention also provides a manufacturing die of the three-dimensional steel fiber, which comprises the following steps: the wire bending machine comprises a working platform mechanism 16 for straightening a wire to be prepared and a flat plate mechanism 9 for receiving the wire to be prepared input by the working platform 16 and bending and forming the wire to be prepared.
Install first guide holder, alignment gyro wheel 2, second guide holder in order above the work platform mechanism 16, give gyro wheel 3, first bearing, second bearing, wherein: the lower end of the feeding roller 3 is connected with a second motor 15; the first guide seat and the second guide seat are both guide seats 1 in the same structure, and the middle of each guide seat 1 is provided with an axial channel through which a wire rod can pass. The straightening rollers 2 are rotatably arranged on the working platform mechanism 16 in a horizontal plane, and two rows of the straightening rollers 2 are arranged for straightening wires. The feed roller 3 includes a driving roller and a driven roller, wherein the driving roller is driven by a second motor 15, the second motor 15 is installed below the working platform 16, and the feed roller 3 is used for conveying the wire forward. The two bearings 4 are a first bearing and a second bearing, the two bearings are arranged on the working platform mechanism 16 through respective bearing seats, and the left end of the wire feeding pipe 7 is in interference connection with the inner rings of the two bearings 4.
A first clamping seat, a second clamping seat, a force application rod 13 for bending and a driving gear 11 for bending are sequentially arranged on the flat plate mechanism 9; the driving gear 11 for bending is driven to rotate by a third motor 10 arranged below the flat plate mechanism 9, and a driven gear 12 for bending, which is meshed with the driving gear 11 for bending, is further arranged on the flat plate mechanism 9;
a hanging plate structure 121 is installed on one side of the bending driven gear 12, a force application rod installation channel is installed on the hanging plate structure 121, and an electric push rod 14 is installed below the force application rod installation channel; the force application rod installation channel penetrates through the driven gear 12 for bending, and a force application rod 13 for bending connected with an electric push rod 14 is installed in the force application rod installation channel;
the initial section of the wire feeding pipe 7 is arranged on the first bearing, extends through the second bearing, the first clamping seat and the second clamping seat and then reaches the front of the force applying rod 13 for bending; 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 upper parts of the first clamping seat and the second clamping seat clamp the wire feeding pipe 7. The first motor 5 drives the driven gear to rotate through the driving gear 6 so as to drive the wire feeding pipe 7 to rotate around the axis of the wire feeding pipe.
Based on the manufacturing mould, the invention also provides a method for manufacturing the three-dimensional steel fiber, which comprises the following steps,
1) threading: selecting a straight wire to be prepared, enabling one end of the wire to pass through a channel in a first guide seat, entering a space between two rows of straightening rollers 2 for wire straightening, then passing through a channel in a second guide seat, then entering a space between a pair of feeding rollers 3, and finally threading the wire into a wire feeding pipe 7;
2) starting an electric push rod 14 to enable a bending force application rod 13 to descend for a certain distance, and starting a third motor 10 to drive a bending driving gear 11 to rotate to drive a bending driven gear 12 to rotate towards one side, so that the bending force application rod 13 is not located right in front of the tail end of the wire feeding pipe 7; the purpose of this step of operation is: the wire is not prevented from passing out of the tail end of the wire feeding pipe 7;
3) starting a second motor 15, driving the feeding roller 3 to convey the wire forward for a certain distance;
4) starting an electric push rod 14 to push out a force applying rod 13 for bending upwards, then starting a third motor 10 to drive a driven gear 12 for bending to rotate by a set angle, the driven gear 12 for bending rotates to drive the force applying rod 13 for bending to rotate at the same time, the force applying rod 13 for bending pushes against the wire rod in the rotating process to bend the wire rod by the set angle, and the third step and the fourth step are repeated to bend the wire rod by various angles in a horizontal plane, wherein at the moment, the bending of each angle in the horizontal plane is finished;
5) the first motor 5 is started to drive the driving gear 6 to rotate, namely, the wire feeding pipe 7 is driven to rotate, so that the flat plate mechanism 9, the driving gear 11 for bending, the driven gear 12 for bending, the force applying rod 13 for bending and the electric push rod 14 are overturned, but the wire is not overturned, so that the wire can be bent in other non-horizontal planes, and a three-dimensional wire is formed;
6) in the working process, the force applying rod 13 for bending needs to be lowered and reset every time bending is finished, so that the wire is not influenced to be output from the wire feeding pipe 7.
The three-dimensional steel fiber of the present application is manufactured by the above method, comprising the steps of,
s1, selecting a straight steel wire with the diameter of D and the length of L to be prepared, enabling one end of the wire to pass through a channel in a first guide seat, enabling the wire to enter between two rows of straightening rollers 2 for wire straightening, then enabling the wire to pass through a channel in a second guide seat, enabling the wire to enter between a pair of feeding rollers 3, and finally enabling the wire to pass through a wire feeding pipe 7;
s2: starting an electric push rod 14 to enable a bending force application rod 13 to descend for a certain distance, and starting a third motor 10 to drive a bending driving gear 11 to rotate to drive a bending driven gear 12 to rotate towards one side, so that the bending force application rod 13 is not located right in front of the tail end of the wire feeding pipe 7; the purpose of this step of operation is: the wire is not prevented from passing out of the tail end of the wire feeding pipe 7;
s3: starting a second motor 15, driving the feeding roller 3 to convey the wire forward for a certain distance;
s4: starting an electric push rod 14 to push out a force application rod 13 for bending upwards, then starting a third motor 10 to drive a driven gear 12 for bending to rotate anticlockwise by an angle theta 4, rotating the driven gear 12 for bending and simultaneously driving the force application rod 13 for bending to rotate, pushing the wire rod by the force application rod 13 for bending in the rotating process, bending the wire rod to form a radius R3, then continuously conveying the wire rod, repeating the steps to bend the wire rod clockwise by the angle theta 3 with the radius R2 to form an anchoring section;
s6, continuously conveying the wire rod for the length L2 to form a straight line segment 2, repeating the steps, and clockwise bending the wire rod by a bending angle theta 1 by using the driven gear 12 for bending and the force applying rod 13 for bending, wherein the bending radius is R1; continuously conveying the length L1 of the wire rod to form a straight line segment 1;
s7: starting a first motor 5 to drive a driving gear 6 to rotate, so that the flat plate mechanism 9, the driving gear 11 for bending, the driven gear 12 for bending, the force applying rod 13 for bending and the electric push rod 14 are turned, but the wire rod is not turned;
s8: repeating the previous bending steps S6 and S7 to bend the wire clockwise by the angle θ 2 with the bending driven gear 12 and the bending force applying rod 13, and the bending radius is R4; continuously conveying the wire rod length L3 in the direction to form a straight line section 3, repeating the previous bending step, clockwise bending the wire rod by a bending driven gear 12 and a bending force application rod 13 by a bending angle theta 5 with a bending radius of R5, then continuously conveying the wire rod, anticlockwise bending the wire rod by a bending angle theta 6 with a radius of R6, and finally continuously conveying the wire rod length L4 to form an anchoring section;
and S9, cutting the wire rod after all the steps are finished, and forming the three-dimensional steel fiber. In the working process, the force applying rod 13 for bending needs to be lowered and reset every time bending is finished, so that the wire is not influenced to be output from the wire feeding pipe 7.
The motor of the application is a program-controlled motor or a motor controlled by other modes.
4 materials were processed by the above method, specifically as follows:
example 1
A steel wire with nominal tensile strength of not less than 1100MPa, a diameter of 0.55mm and a length of 44mm is used, and the steel wire is prepared according to the steps, wherein the length L1 of the straight line section 1 is 12.0mm, the length L2 of the straight line section 2 is 6.0mm, the length L3 of the straight line section 3 is 6.0mm, the radiuses R1 and R4 of the arc sections 4 and 6 are 4.0mm, the angles theta 1 and theta 2 are pi/2, the radiuses R2 and R3 of two opposite small arcs of the large arc section 5 are 2.0mm, the angles theta 3 and theta 4 are pi/4, the radiuses R5 and R6 of two opposite small arcs of the large arc section 8 are 2.0mm, the angles theta 5 and theta 6 are pi/4, the lengths L4 of the two straight line sections 7 and 9 are 2.0mm, and the length-diameter ratio of the steel fiber is 80.
Example 2
A steel wire with nominal tensile strength of not less than 1100MPa, a diameter of 0.55mm and a length of 44mm is used, and the steel wire is prepared according to the steps, wherein the length L1 of the straight line section 1 is 9.0mm, the length L2 of the straight line section 2 is 9.0mm, the length L3 of the straight line section 3 is 9.0mm, the radiuses R1 and R4 of the arc sections 4 and 6 are 2.5mm, the angles theta 1 and theta 2 are pi/2, the radiuses R2 and R3 of two opposite small arcs of the large arc section 5 are 2.0mm, the angles theta 3 and theta 4 are pi/4, the radiuses R5 and R6 of two opposite small arcs of the large arc section 8 are 2.0mm, the angles theta 5 and theta 6 are pi/4, the lengths L4 of the two straight line sections 7 and 9 are 1.5mm, and the length-diameter ratio of the steel fiber is 80.
Example 3
A steel wire with the nominal tensile strength of not less than 1100MPa, the diameter of 0.55mm and the length of 36mm is adopted, and the steel wire is prepared according to the steps, wherein the length L1 of the straight line section 1 is 7.0mm, the length L2 of the straight line section 2 is 7.0mm, the length L3 of the straight line section 3 is 7.0mm, the radiuses R1 and R4 of the arc sections 4 and 6 are 2.0mm, the angles theta 1 and theta 2 are pi/2, the radiuses R2 and R3 of two opposite small arcs of the large arc section 5 are 2.0mm and 1.5mm respectively, the angles theta 3 and theta 4 are 2.0mm and 1.5mm respectively, the radiuses R5 and R6 of two opposite small arcs of the large arc section 8 pi are 2.0mm and 1.5mm respectively, the angles theta 5 and theta 6 are pi/4, the lengths L4 of the two straight line sections 7 and 9 are 1.5mm, and the length-diameter ratio of the steel fiber is 65.
Example 4
A steel wire with the nominal tensile strength of not less than 2000MPa, the diameter of 0.20mm and the length of 36mm is adopted, and the steel wire is prepared according to the steps, wherein the length L1 of the straight line section 1 is 10.0mm, the length L2 of the straight line section 2 is 5.0mm, the length L3 of the straight line section 3 is 5.0mm, the radii R1 and R4 of the arc sections 4 and 6 are 2.5mm, the angles theta 1 and theta 2 are pi/2, the radii R2 and R3 of two opposite small arcs of the large arc section 5 are 2.0mm and 1.5mm respectively, the angles theta 3 and theta 4 are 2.0mm and 1.5mm respectively, the radii R5 and R6 of the two opposite small arcs of the large arc section 8 are 2.0mm and 1.5mm respectively, the angles theta 5 and theta 6 are pi/4, the lengths L4 of the two straight line sections 7 and 9 are 1.5mm, and the length-diameter ratio of the steel fiber is 180.
The difference of the concrete mechanical properties between the reference sample doped with the common end hook steel fiber and the example 2 is compared, and the following conclusion is reached:
table 1 list of concrete mix proportions:
after the concrete is prepared completely, the concrete is placed into a standard curing box for curing for 28 days, and an electro-hydraulic servo universal testing machine is used for carrying out axial compression performance testing.
The test result shows that compared with the common end hook steel fiber, the compressive strength of the SIFCON prepared by using the three-dimensional steel fiber is improved by 60%, the compressive strain corresponding to the peak stress is improved by 50%, the concrete performance is greatly improved, and compared with the arrangement of the fiber in the direction parallel to the loading direction, the compressive strength difference value of the fiber arranged in the direction perpendicular to the loading direction is within 5%, the compressive strain difference value corresponding to the peak stress is within 3%, and each direction can play an effective compression resisting role, specifically shown in fig. 5 and 6.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. Three-dimensional steel fibre, its characterized in that:
the three-dimensional steel fiber consists of a plurality of circular arc sections and straight line sections, wherein the straight line section (1) is arranged in the X-axis direction, the straight line section (2) is arranged in the Y-axis direction, and the straight line section (3) is arranged in the Z-axis direction; the straight line section (1) is connected with the straight line section (2) through an arc section (4), and the straight line section (1) is connected with the straight line section (3) through an arc section (6) to form a main body part;
the two ends of the fiber are not provided with anchoring sections; or the two ends of the fiber are provided with anchoring sections;
wherein: the anchoring section can be composed of one or more end hooks arranged continuously, each end hook is composed of a large circular arc section and a straight line section, wherein: the large arc section (5) is formed by bending two small arcs in opposite directions, and the other end of the large arc section (5) is connected with the straight line section (7) to form an end hook; the large arc section (8) is formed by bending two small arcs in opposite directions, and the other end of the large arc section (8) is connected with the straight line section (9) to form an end hook.
2. The three-dimensional steel fiber according to claim 1, wherein: the preparation of the three-dimensional steel fiber adopts a steel wire with tensile strength not lower than 600MPa, the diameter of the steel wire is 0.15-2.0 mm, the length of the steel wire is 30.0-200.0 mm, and the length-diameter ratio is 40-450.
3. The three-dimensional steel fiber according to claim 1, wherein: the projection length ratio of the three-dimensional steel fibers in the X, Y, Z three directions is 1.0:0.5: 0.5-1.0: 1.5: 1.5.
4. The three-dimensional steel fiber according to claim 1, wherein: the angle between the arc section (4) and the arc section (6) is pi/4-pi/2; the angle between the two small arcs of the large arc section (5) and the large arc section (8) is pi/6-pi/3.
5. The infiltration-poured fiber concrete is characterized in that: comprising a three-dimensional steel fibre according to any one of claims 1-4.
6. A mould for the production of three-dimensional steel fibres according to any one of claims 1 to 4, characterised in that it comprises: the wire bending machine comprises a working platform mechanism (16) for straightening a wire to be prepared and a flat plate mechanism (9) for receiving the wire to be prepared input by the working platform (16) and bending and forming the wire to be prepared.
7. The production mold according to claim 6, wherein: install first guide holder, alignment gyro wheel (2), second guide holder in order above work platform mechanism (16), give gyro wheel (3), first bearing, second bearing, wherein: the lower end of the feeding roller (3) is connected with a second motor (15);
a first clamping seat, a second clamping seat, a force applying rod (13) for bending and a driving gear (11) for bending are sequentially arranged on the flat plate mechanism (9); the bending driving gear (11) is driven to rotate by a third motor (10) arranged below the flat plate mechanism (9), and a bending driven gear (12) meshed with the bending driving gear (11) is further mounted on the flat plate mechanism (9);
a hanging plate structure (121) is installed on one side of the bending driven gear (12), a force application rod installation channel is installed on the hanging plate structure (121), and an electric push rod (14) is installed below the force application rod installation channel; the force application rod installation channel penetrates through the driven gear (12) for bending, and a force application rod (13) for bending connected with an electric push rod (14) is installed in the force application rod installation channel;
the initial section of the wire feeding pipe (7) is arranged on the first bearing, extends through the second bearing, the first clamping seat and the second clamping seat and then reaches the front of the force application rod (13) for bending; 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 upper parts of the first clamping seat and the second clamping seat clamp the wire feeding pipe (7).
8. A method of manufacturing three-dimensional steel fibers using the manufacturing mold according to claim 7, comprising the steps of,
1) threading: selecting a straight steel wire of a wire to be prepared, enabling one end of the wire to pass through a channel in a first guide seat, entering a space between two rows of straightening rollers (2) for wire straightening, then passing through a channel in a second guide seat, then entering a space between a pair of feeding rollers (3), and finally threading the wire into a wire feeding pipe (7);
2) starting an electric push rod (14) to enable a force application rod (13) for bending to descend for a certain distance, and starting a third motor (10) to drive a driving gear (11) for bending to rotate to drive a driven gear (12) for bending to rotate towards one side, so that the force application rod (13) for bending is not located right in front of the tail end of the wire feeding pipe (7); the purpose of this step of operation is: the wire is not prevented from passing out of the tail end of the wire feeding pipe (7);
3) starting a second motor (15) to drive the feeding roller (3) to convey the wire forward for a certain distance;
4) starting an electric push rod (14) to push out a force application rod (13) for bending upwards, then starting a third motor (10) to drive a driven gear (12) for bending to rotate for a set angle, the rotation of the driven gear (12) for bending can drive the force application rod (13) for bending to rotate at the same time, the force application rod (13) for bending can push against the wire rod in the rotating process, so that the wire rod is bent for the set angle, the third step and the fourth step are repeated, the wire rod can be bent for various angles in the horizontal plane, and at the moment, the bending for each angle in the horizontal plane is completed;
5) the first motor (5) is started to drive the driving gear (6) to rotate, namely, the wire feeding pipe (7) is driven to rotate, so that the flat plate mechanism (9), the driving gear (11) for bending, the driven gear (12) for bending, the force applying rod (13) for bending and the electric push rod (14) are overturned, but the wire is not overturned, so that the wire can be bent in other non-horizontal planes, and a three-dimensional wire is formed;
6) in the working process, the force applying rod (13) for bending needs to be lowered and reset every time bending is finished, so that the wire is prevented from being output from the wire feeding pipe (7).
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| CN202111038704.4A CN113754332A (en) | 2021-09-06 | 2021-09-06 | Three-dimensional steel fiber, manufacturing mold and method and concrete applying three-dimensional steel fiber |
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| CN202111038704.4A CN113754332A (en) | 2021-09-06 | 2021-09-06 | Three-dimensional steel fiber, manufacturing mold and method and concrete applying three-dimensional steel fiber |
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|---|---|---|---|---|
| US5170654A (en) * | 1990-04-06 | 1992-12-15 | Anagnostopoulos Panagiotis A | Method for wire bending in three dimensions |
| US20080078226A1 (en) * | 2006-10-03 | 2008-04-03 | Antonios Anagnostopoulos | System and process for production of three-dimensional products from wire |
| CN103752723A (en) * | 2011-12-31 | 2014-04-30 | 中山市奥美森工业有限公司 | Device for bending wire |
| US10563403B1 (en) * | 2018-10-30 | 2020-02-18 | King Saud University | Multi-leg fiber reinforced concrete |
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2021
- 2021-09-06 CN CN202111038704.4A patent/CN113754332A/en active Pending
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| US5170654A (en) * | 1990-04-06 | 1992-12-15 | Anagnostopoulos Panagiotis A | Method for wire bending in three dimensions |
| US20080078226A1 (en) * | 2006-10-03 | 2008-04-03 | Antonios Anagnostopoulos | System and process for production of three-dimensional products from wire |
| CN103752723A (en) * | 2011-12-31 | 2014-04-30 | 中山市奥美森工业有限公司 | Device for bending wire |
| US10563403B1 (en) * | 2018-10-30 | 2020-02-18 | King Saud University | Multi-leg fiber reinforced concrete |
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| 刘冬梅等: "钢纤维混凝土断裂过程激光实时全息干涉法研究", 《岩土力学》, no. 09, 10 September 2007 (2007-09-10) * |
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