CN209682546U - An Intelligent Oriented Fiber System Applicable to FRP Strengthening Steel Fiber Concrete - Google Patents

Abstract

The utility model discloses an intelligent directional fiber system suitable for FRP reinforced steel fiber concrete, which is characterized in that it includes a fixed unit, a magnetic field unit, an intelligent control unit and a moving unit, the fixed unit is composed of an insulating support, the The magnetic field unit consists of DC power supply, current control knob, protection resistor, first solenoid, second solenoid, third solenoid, fourth solenoid, fifth solenoid, sixth solenoid, iron Core, resin and switch, the motion unit is composed of lifting device, carrying device and intelligent switch. The utility model makes up for the deposition effect caused by the gravity effect on the steel fiber through the magnetic field, and improves the arrangement of the slender steel fiber according to the principle of magnetization and hysteresis effect. Through the moving part and the intelligent control part, the overall side wall The uniform reinforcement alleviates the adverse effect of the side wall effect of the steel fiber and effectively improves the arrangement of the steel fiber.

Description

An Intelligent Oriented Fiber System Applicable to FRP Strengthening Steel Fiber Concrete

technical field

The utility model belongs to the technical field of concrete preparation, in particular to an intelligent directional fiber system suitable for FRP reinforced steel fiber concrete.

Background technique

During the preparation process of steel fiber reinforced concrete, the angular distribution of steel fibers inside it has strong randomness. The effective coefficient of fibers is generally low, and the effective coefficient of fibers distributed in two dimensions is often lower than 0.4; while the effective coefficient of fibers distributed in three dimensions is more likely to be lower than 0.25. Therefore, only a small fraction of fibers can effectively take up tensile and bending stresses. Under the joint action of vibrating process and gravity effect, the steel fiber will continue to move to the lower part of the concrete, and tend to be in the same direction as the plane perpendicular to the gravity. This phenomenon is called the gravity effect of the fiber. The distribution is sparse at the top and dense at the bottom, resulting in a decrease in the actual strength compared with the theoretical value. Therefore, a device is needed to improve the direction distribution of its fibers and solve the adverse effects of gravity effects. Steel fiber is a ferromagnetic substance with a magnetic permeability μ>>1 and a strong magnetization. From this, it is thought of using electromagnetic fields to accurately and effectively control the arrangement and spatial position of fibers. In the prior art, the ineffective arrangement of steel fibers leads to the waste of steel and does not significantly improve the strength of concrete, and even aggravates the unfavorable phenomenon of the honeycomb pockmarked surface of the concrete bottom layer and leads to the occurrence of multiple cracks in the concrete side wall. In the prior art, methods such as centrifugation and electromagnetic orientation are used to improve the arrangement of steel fibers, but the requirements for conditions are too harsh and it is difficult to apply them on a large scale; there is no method for improving the gravity effect and side wall effect.

Utility model content

The technical problem to be solved by this utility model is to provide an intelligent directional fiber system suitable for FRP reinforced steel fiber concrete in view of the above-mentioned deficiencies in the prior art. The principle of magnetization phenomenon and hysteresis effect improves the arrangement of slender steel fibers, and uniformly strengthens the overall side wall through the moving part and intelligent control part, alleviating the adverse effects of the side wall effect of steel fibers.

For realizing above-mentioned technical purpose, the technical scheme that the utility model takes is:

An intelligent directional fiber system suitable for FRP reinforced steel fiber concrete, characterized in that it includes a fixed unit, a magnetic field unit, an intelligent control unit and a motion unit, the fixed unit is composed of insulating brackets, and the insulating brackets are composed of four An insulating rod is fixedly mounted on an insulating base plate, the magnetic field unit is mounted on the fixed unit, and the magnetic field unit is composed of a DC power supply, a current control knob, a protection resistor, a first solenoid, a second solenoid tube, third solenoid, fourth solenoid, fifth solenoid, sixth solenoid, iron core, resin and switch, the second solenoid, third solenoid, fourth solenoid The coil tube, the fifth solenoid tube and the sixth coil tube are stacked together from top to bottom, the first solenoid tube is installed on the motion unit, the iron core is installed in the first solenoid tube and Resin is filled between the iron core and the first solenoid, the DC power supply, the current control knob, the protection resistor, the switch and the first solenoid are connected through wires to form a loop, and the second solenoid The loops are respectively formed with the DC power supply, the current control knob, the protection resistor and the switch through the wires, and the third solenoid is respectively connected with the DC power supply, the current control knob, the protection resistor and the switch through the wires. The wire tube respectively forms a loop with the DC power supply, the current control knob, the protection resistor and the switch through the wires, and the fifth solenoid respectively forms a loop with the DC power supply, the current control knob, the protection resistor and the switch through the wires. The six helical tubes respectively form a circuit with the DC power supply, the current control knob, the protection resistor and the switch through wires. The moving unit is composed of a lifting device, a carrying device and an intelligent switch. The lifting device is installed on a fixed unit. The carrying device is installed on the lifting device, the intelligent switch is installed on the left side of the fixed unit, the intelligent control unit is composed of a processor and a sensor, and the intelligent switch in the processor, sensor and motion unit passes through The wires form a loop.

The current of the DC power supply in the above magnetic field unit is 0-20A and the voltage of the DC power supply is 0-30V.

The size of the first solenoid in the above-mentioned magnetic field unit is smaller than the section size of the concrete and the specification of the first solenoid is 300-7000 turns.

The size of the second solenoid, the third solenoid, the fourth solenoid, the fifth solenoid and the sixth solenoid in the above-mentioned magnetic field unit is larger than the section size of the concrete and their specifications are 300-7000 turns.

The first solenoid, the second solenoid, the third solenoid, the fourth solenoid, the fifth solenoid and the sixth solenoid in the above magnetic field unit are all placed vertically.

The insulating support in the utility model is connected by an insulating structure, so that the whole device remains stable when the test piece is placed, and does not interfere with the magnetic field part; the current control knob is controlled as the first solenoid, the second solenoid, the second solenoid The three solenoids, the fourth solenoid, the fifth solenoid and the sixth solenoid provide the voltage and current of the direct current, which are controlled by the intelligent control unit; the iron core is located in the first solenoid, and the middle gap is formed by Resin filling, so that the three are connected as a whole, to ensure stability, the switch is controlled by the intelligent control unit; the first solenoid, the second solenoid, the third solenoid, the fourth solenoid, the fifth solenoid The line pipe and the sixth helical tube are vertically placed, and the magnetic field force produced by it acts on the steel fibers in the direction of the projected plane of the solenoid section in the opposite direction to the direction of gravity; The magnetic field force has a horizontal component force toward the axis and a vertical component force opposite to the gravity, which makes the magnetized steel fibers mainly move in the opposite direction of gravity, and the steel fibers on the side walls move closer to the axis; the motion unit The first solenoid can be moved up and down; the sensor can detect the position of the steel fiber in the uncured concrete, and feed back the signal to the processor, and the processor monitors the current control knob and the motion unit in real time according to the feedback result adjust.

The utility model has the advantages of the following points: the deposition effect caused by the gravity effect on the steel fiber is partially compensated by the magnetic field, and the arrangement of the slender steel fiber is improved according to the principle of the magnetization phenomenon and the hysteresis effect. In the control part, the overall side wall is uniformly strengthened, which alleviates the adverse effect of the side wall effect of steel fibers; effectively improves the arrangement of steel fibers, enhances the effective coefficient of steel fibers, and improves the strength of steel fiber concrete.

Description of drawings

Fig. 1 is a structural axonometric view of the utility model;

Fig. 2 is a structural front view of the utility model;

Fig. 3 is a structural axonometric view of the magnetic field unit of the present invention;

Fig. 4 is the structural front view of the magnetic field unit of the present utility model;

Fig. 5 is a top view of the structure of the magnetic field unit of the present invention.

The reference signs therein are: fixing unit 1, insulating support 11, magnetic field unit 2, DC power supply 201, current control knob 202, protection resistor 203, first solenoid 204, second solenoid 205, third solenoid Tube 206, fourth solenoid 207, fifth solenoid 208, sixth solenoid 209, iron core 210, resin 211, switch 212, intelligent control unit 3, processor 31, sensor 32, motion unit 4, lifting Device 41, carrying device 42, intelligent switch 43.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the utility model is further described:

An intelligent directional fiber system suitable for FRP reinforced steel fiber concrete is characterized in that it includes a fixed unit 1, a magnetic field unit 2, an intelligent control unit 3 and a motion unit 4, the fixed unit 1 is composed of an insulating support 11, the The insulating bracket 11 described above is composed of four insulating rods fixedly installed on the insulating base plate, the described magnetic field unit 2 is installed on the fixed unit 1, and the described magnetic field unit 2 is protected by a DC power supply 201, a current control knob 202, Resistor 203, first solenoid 204, second solenoid 205, third solenoid 206, fourth solenoid 207, fifth solenoid 208, sixth solenoid 209, iron core 210, resin 211 And the switch 212, the second solenoid 205, the third solenoid 206, the fourth solenoid 207, the fifth solenoid 208 and the sixth solenoid 209 are stacked together from top to bottom, The first solenoid 204 is installed on the motion unit 4, the iron core 210 is installed in the first solenoid 204 and resin 211 is filled between the iron core 210 and the first solenoid 204, so The DC power supply 201, the current control knob 202, the protection resistor 203, the switch 212 and the first solenoid 204 are connected to form a circuit through wires, and the second solenoid 205 is respectively connected to the DC power supply 201 and the current through wires. The control knob 202, the protection resistor 203 and the switch 212 form a loop, the third solenoid 206 forms a loop with the DC power supply 201, the current control knob 202, the protection resistor 203 and the switch 212 respectively through wires, and the fourth solenoid The wire tube 207 forms a loop with the DC power supply 201, the current control knob 202, the protection resistor 203 and the switch 212 respectively through wires, and the fifth solenoid 208 is respectively connected with the DC power supply 201, the current control knob 202, and the protection resistor 203 through wires. and the switch 212 to form a loop, the sixth helical tube 209 forms a loop with the DC power supply 201, the current control knob 202, the protection resistor 203 and the switch 212 respectively through wires, and the described motion unit 4 is composed of a lifting device 41 and a carrying device 42 Composed of intelligent switch 43, the lifting device 41 is installed on the fixed unit 1, the carrying device 42 is installed on the lifting device 41, the intelligent switch 43 is installed on the left side of the fixed unit 1, the The intelligent control unit 3 is composed of a processor 31 and a sensor 32, and the processor 31, the sensor 32 and the intelligent switch 43 in the motion unit 4 form a loop through wires.

In an embodiment, the current of the DC power supply 201 in the magnetic field unit 2 is 0-20A and the voltage of the DC power supply 201 is 0-30V.

In an embodiment, the size of the first solenoid 204 in the magnetic field unit 2 is smaller than the cross-sectional size of the concrete and the specification of the first solenoid 204 is 300-7000 turns.

In the embodiment, the size of the second solenoid 205, the third solenoid 206, the fourth solenoid 207, the fifth solenoid 208 and the sixth solenoid 209 in the magnetic field unit 2 is larger than the size of the concrete section and their The specification is 300-7000 turns.

In the embodiment, the first solenoid 204, the second solenoid 205, the third solenoid 206, the fourth solenoid 207, the fifth solenoid 208 and the sixth solenoid 209 in the magnetic field unit 2 are all Use vertical placement.

When the electric current of the device of the utility model is too large, the magnetic field intensity and the magnetic force are too large, and the steel fibers do obvious accelerated motion, which will cause gaps between the fibers and the concrete. When the current is too small, the effect of the magnetic field on the steel fiber is not obvious. After determining the initial size of the current, turn on the switch after regulating the initial position of the current control knob 202, and control the first solenoid 204, the second solenoid 205, the third solenoid 206, and the fourth solenoid through the current control knob 202. The adjustment of the wire tube 207, the fifth solenoid tube 208 and the sixth coil tube 209 in a certain order can change the different superposition conditions of the electromagnetic field in different time periods, thereby guiding the different movement conditions of the steel fibers in different time periods. The addition of the electromagnetic field mainly makes the arrangement of steel fibers tend to be more vertical. The vertical direction is the direction of tensile stress and thus the main arrangement direction of effective fibers in fiber reinforced concrete. The vertically arranged steel fibers can effectively share tensile stress. For the cracks that have already occurred, the steel fibers spanning both sides of the cracks can prevent the further development of the cracks, and improve the crack resistance of the concrete by reducing the width of the cracks; among them, the steel fibers that are not completely consistent with the direction of the tensile stress can resist cracking of the concrete The lifting effect of tensile stress is related to the degree of deviation of the direction, the more it deviates from the direction of tensile stress, the smaller the lifting effect is. The steel fibers at the same level as the cracks have little effect on the improvement of the crack resistance of the concrete. Therefore, improving the arrangement of steel fibers also improves the strength of fiber-reinforced concrete.

The first solenoid 204 is suspended vertically above the mold, and makes the axis of the mold coincide with the axis of the iron core 210 . The first solenoid 204 is connected to the current control knob 202 to change the magnitude and direction of the current flowing into the electrified first solenoid 204 , so as to regulate the appropriate magnetic field strength and direction. The controllable magnetic force can change the speed of steel fiber movement. The direction of action of the magnetic field force generated by it on the steel fibers in the projected plane direction of the solenoid section is opposite to the direction of gravity; for the magnetic field force of the steel fibers on the projected plane of the non-solenoid section, there is a horizontal component towards the axis. The force and a vertical component opposite to gravity cause the magnetized steel fibers to move in the opposite direction of gravity. The magnitude of the required electromagnetic force is related to the workability of the steel fiber concrete mixture. The better the workability, the smaller the electromagnetic force required, and the worse the workability, the greater the required electromagnetic force. During the vibration process, the concrete is in a state of solid-liquid coexistence and has good workability, and the steel fibers can produce a certain amount of deflection movement. The better the workability of concrete, the better the improvement effect of fiber arrangement. After the vibrating process, the concrete enters the curing process. During this process, the fibers inside the concrete will not be affected by external effects, and the fiber arrangement direction and spatial position are relatively stable. After hardening, it can form a steel with the same direction as the magnetic field and uniform space Fiber concrete. The electromagnetic force received by the steel fiber is greater than the resistance of the concrete to produce a vertical upward movement to compensate for the influence of the deposition caused by the gravity effect, so that the phenomenon of sparse distribution of the steel fiber in the concrete can be alleviated, and the strength of the fiber concrete can be effectively increased.

The selection of the size of the solenoid should be smaller than the size of the concrete section. Due to the guidance of the magnetic field lines, the steel fibers of the side walls tend to move inward, which also to a certain extent slows down the side wall effect caused by the side wall fibers being constrained by the side walls and accumulating inside the formwork during the vibration process. Negative Effects.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (5)

1. a kind of intelligent positioning fiber system for reinforcing steel fiber reinforced concrete suitable for FRP, it is characterised in that: including fixed cell (1), magnetic field units (2), intelligent control unit (3) and moving cell (4), the fixed cell (1) is by insulating support (11) Composition, the insulating support (11) You Sigen insulating bar, which is fixedly mounted on insulating base, to be composed, and the magnetic field is single First (2) are mounted on fixed cell (1), the magnetic field units (2) by DC power supply (201), current control knob (202), Protective resistance (203), the first solenoid (204), the second solenoid (205), third solenoid (206), the 4th solenoid (207), the 5th solenoid (208), the 6th helix tube (209), iron core (210), resin (211) and switch (212), described the Two solenoids (205), third solenoid (206), the 4th solenoid (207), the 5th solenoid (208) and the 6th helix tube (209) it is successively stacked together from top to bottom, first solenoid (204) is mounted on moving cell (4), the iron Core (210) is mounted in the first solenoid (204) and between iron core (210) and the first solenoid (204) filled with resin (211), the DC power supply (201), current control knob (202), protective resistance (203), switch (212) and the first helical Manage (204) between by conducting wire connection composition circuit, second solenoid (205) pass through conducting wire respectively with DC power supply (201), current control knob (202), protective resistance (203) and switch (212) form circuit, the third solenoid (206) by conducting wire respectively with DC power supply (201), current control knob (202), protective resistance (203) and switch (212) group At circuit, the 4th solenoid (207) by conducting wire respectively with DC power supply (201), current control knob (202), protect Protect resistance (203) and switch (212) form circuit, the 5th solenoid (208) pass through conducting wire respectively with DC power supply (201), current control knob (202), protective resistance (203) and switch (212) form circuit, the 6th helix tube (209) by conducting wire respectively with DC power supply (201), current control knob (202), protective resistance (203) and switch (212) group At circuit, the moving cell (4) is made of lifting device (41), loading device (42) and intelligent switch (43), described Lifting device (41) is mounted on fixed cell (1), and the loading device (42) is mounted on lifting device (41), described Intelligent switch (43) is mounted on the left side of fixed cell (1), and the intelligent control unit (3) is by processor (31) and sensor (32) it forms, the intelligent switch (43) in the processor (31), sensor (32) and moving cell (4) is made up of conducting wire Circuit.

2. a kind of intelligent positioning fiber system for reinforcing steel fiber reinforced concrete suitable for FRP according to claim 1, special Sign is: the electric current of the DC power supply (201) in the magnetic field units (2) is the voltage of 0~20A and DC power supply (201) For 0~30V.

3. a kind of intelligent positioning fiber system for reinforcing steel fiber reinforced concrete suitable for FRP according to claim 1, special Sign is: the first solenoid (204) size in the magnetic field units (2) is less than cross section size and the first solenoid (204) specification is 300~7000 circles.

4. a kind of intelligent positioning fiber system for reinforcing steel fiber reinforced concrete suitable for FRP according to claim 1, special Sign is: the second solenoid (205), third solenoid (206), the 4th solenoid (207) in the magnetic field units (2), 5th solenoid (208) and the 6th helix tube (209) size are greater than cross section size and their specification is 300~7000 Circle.

5. a kind of intelligent positioning fiber system for reinforcing steel fiber reinforced concrete suitable for FRP according to claim 1, special Sign is: the first solenoid (204), the second solenoid (205), third solenoid (206) in the magnetic field units (2), 4th solenoid (207), the 5th solenoid (208) and the 6th helix tube (209) are all placed using vertical.