Magnetic concrete member, manufacturing method of magnetic concrete member and hoisting method of magnetic concrete member

Abstract

The invention provides a magnetic concrete member, a manufacturing method of the magnetic concrete member and a hoisting method of the magnetic concrete member. The magnetic concrete member is formed by mixing cement, magnetic powder, sand, coarse aggregate, water, a water reducing agent and steel fibers. Wherein the mass ratio of the cement to the magnetic powder to the sand to the coarse aggregate to the water is 1: 1: 1.5: 1: 0.46. According to the magnetic concrete member provided by the invention, the magnetic powder and the mixture are added into the concrete member, a traditional concrete member is changed into the magnetic concrete member, at the moment, the magnetic concrete member can be magnetically attracted through magnetic hoisting equipment, punching and embedded part mounting on the magnetic concrete member are not needed, the assembly difficulty is reduced, and the cost is saved; the magnetic concrete member is attracted and lifted in a magnetic attraction mode, uniform stress can be achieved when the prefabricated member is lifted, point stress is converted into face stress, deformation and damage to the prefabricated member are smaller, and the quality of the magnetic concrete member is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering construction, and in particular relates to a magnetic concrete component, a manufacturing method of the magnetic concrete component and a hoisting method thereof. Background Art

[0002] Prefabricated buildings are a new type of building production method that uses prefabricated components in factories and on-site assembly as a model to achieve sustainable development of building products that are energy-saving, environmentally friendly, and maximize the value of the entire life cycle. Prefabricated buildings avoid a large amount of assembly work on site, greatly improve construction efficiency, and shorten the construction period.

[0003] At present, the lifting of precast concrete components is mainly achieved by combining conventional cranes and lifting ropes, and the assembly is carried out using the lifting measures of embedded parts. The location, number of lifting points, inclination angle and strength of the lifting ropes are very critical. There are many factors to consider in the construction and the amount of calculation is large. Stress concentration often occurs in the lifting area, and deformation occurs in severe cases, causing damage to the precast parts. In long-term construction, lifting tools such as lifting ends and ropes need to be regularly maintained and repaired, which poses a safety hazard. Multiple factors affect construction efficiency and quality. Summary of the invention

[0004] The embodiments of the present invention provide a magnetic concrete component, a method for manufacturing a magnetic concrete component and a method for hoisting the component, aiming to solve the technical problems in the prior art that the assembled components are deformed due to stress concentration at the lifting point, the calculation amount for hoisting is large, and the assembly efficiency and assembly quality are affected.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, a magnetic concrete component is provided, which is mainly formed by mixing cement, magnetic powder, sand, coarse aggregate, water, a water reducer and steel fiber; wherein the mass ratio of the cement, the magnetic powder, the sand, the coarse aggregate and the water is 1:1:1.5:1:0.46.

[0006] In combination with the first aspect, in a possible implementation, the magnetic powder includes neodymium iron boron magnetic powder and strontium ferrite magnetic powder, and the mass ratio of the neodymium iron boron magnetic powder to the strontium ferrite magnetic powder is between 2:8 and 4:6.

[0007] Compared with the prior art, the magnetic concrete component provided by the present invention adds magnetic powder and a mixture to the concrete component, and converts the traditional concrete component into a magnetic concrete component. At this time, the magnetic concrete component can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component and install embedded parts, thereby reducing the difficulty of assembly and saving costs. The situation in which the magnetic concrete component is damaged due to local stress concentration will not occur, and the integrity of the magnetic concrete component is guaranteed. The magnetic concrete component is adsorbed and lifted by magnetic attraction, and uniform force can be applied to the prefabricated component during lifting, and point force is converted into surface force, which reduces deformation and damage to the prefabricated component, reduces the defective rate, improves the quality of the magnetic concrete component, and saves manufacturing costs.

[0008] In a second aspect, the present application also provides a method for manufacturing a magnetic concrete component, which is used to manufacture a magnetic concrete component as described in any of the above possible implementations, comprising the following steps: Mixing cement, magnetic powder, sand and coarse aggregate to form a semi-finished product; Adding water, a water reducing agent and steel fibers into the semi-finished product to form a finished product; The finished product is cured to form a magnetic concrete component.

[0009] Compared with the prior art, the method for manufacturing a magnetic concrete component provided by the present invention adds magnetic powder and a mixture to a concrete component, thereby converting a traditional concrete component into a magnetic concrete component. At this time, the magnetic concrete component can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component and install embedded parts, thereby reducing the difficulty of assembly and saving costs. There is no situation in which the magnetic concrete component is damaged due to local stress concentration, thereby ensuring the integrity of the magnetic concrete component.

[0010] In a third aspect, the present application further provides a method for hoisting a magnetic concrete component, which is used to hoist a magnetic concrete component as in any of the above possible implementations, and is characterized in that it comprises the following steps: S1: magnetizing the magnetic concrete component; S2: using an electromagnetic crane to absorb the magnetic concrete component and move it to a preset position for unloading; S3: pouring magnetic concrete slurry between the precast concrete part and the reserved hole at the preset position; S4: Demagnetizing the magnetic concrete component.

[0011] In combination with the third aspect, in a possible implementation, step S1 is implemented based on an electromagnetic chuck, and the electromagnetic chuck is placed on the magnetic concrete component, and current is applied to the electromagnetic chuck to generate a strong magnetic field to magnetize the magnetic concrete component.

[0012] In combination with the third aspect, in a possible implementation, the electromagnetic crane used in step S2 includes a lifting body and an electromagnetic chuck, wherein a free end of the lifting body can rotate freely, and the free end is connected to the electromagnetic chuck; The electromagnetic suction cup includes a shell, a controller, a coil and an iron core. The coil is wound around the outer circumference of the iron core. The iron core and the coil are arranged in the shell. The shell is connected to the free end of the lifting body. The controller is arranged in the shell and is conductively connected to the coil and the power supply respectively.

[0013] In conjunction with the third aspect, in a possible implementation, in step S2, before moving to a preset position for unloading, the method further includes: The magnetic concrete component is positioned at a preset position.

[0014] In combination with the third aspect, in a possible implementation, a magnet alignment device is installed at a preset position, and a middle magnetic pole of the magnet alignment device is the same as a magnetic pole of the magnetic concrete component; When the magnetic concrete component is aligned with the preset position, the magnetic alignment device is removed.

[0015] In combination with the third aspect, in a possible implementation, step S4 includes: demagnetizing the magnetic concrete component by using an alternating current demagnetization method.

[0016] Compared with the prior art, the magnetic concrete component hoisting method provided by the present invention adds magnetic powder and mixture to the concrete component, and transforms the traditional concrete component into a magnetic concrete component. At this time, the magnetic concrete component can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component and install embedded parts, which reduces the difficulty of assembly and saves costs. There will be no local stress concentration that causes damage to the magnetic concrete component, and the integrity of the magnetic concrete component is guaranteed; the magnetic concrete component is adsorbed and lifted by magnetic attraction, and the force is uniform when the prefabricated component is lifted, and the force is converted from point to surface, which causes less deformation and damage to the prefabricated component, reduces the defective rate, improves the quality of the magnetic concrete component, and saves manufacturing costs. The present application uses an electromagnetic crane to move the magnetic concrete component to a specified position using the principle that like poles repel and opposite poles attract. No mechanical connection is required during the loading and unloading process, which reduces the difficulty of assembly, and the speed of adsorption and repulsion is fast, which improves the assembly efficiency; during loading and unloading, the contact area between the magnetic concrete component and the electromagnetic crane is large, which improves the safety of assembly. The magnetic properties of magnetic concrete components are used to achieve the compactness of concrete pouring. The presence of magnetic force allows the poured concrete to fill the holes tightly and firmly, preventing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of lifting a magnetic concrete component provided by an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of assembly of electromagnetic chuck and magnetic concrete component used in; Figure 3 A schematic diagram of the structure of a magnet alignment device used in one embodiment of the present invention; Figure 4 The figure is a schematic diagram of the alignment between the magnet alignment device and the magnetic concrete component used in one embodiment of the present invention.

[0019] Description of reference numerals: 1. Magnetic concrete components; 2. Electromagnetic crane; 21. Lifting body; 22. Electromagnetic suction cup; 3. Magnetic alignment device; 31. Permanent magnet; 32. Sensor; 33. Electromagnet; 34. Circuit board. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0025] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0028] Please also read Figures 1 to 4 The magnetic concrete component provided by the present invention is now described. The magnetic concrete component is mainly formed by mixing cement, magnetic powder, sand, coarse aggregate, water, water reducing agent and steel fiber; wherein the mass ratio of cement, magnetic powder, sand, coarse aggregate and water is 1:1:1.5:1:0.46.

[0029] It should be noted that the magnetic concrete component provided in this embodiment is prepared by first mixing cement, sand, magnetic powder and coarse aggregate to form a semi-finished product, and then adding water, a water reducing agent and steel fiber to form a prefabricated magnetic concrete component. The magnetic concrete component can be obtained by curing and molding.

[0030] The magnetic concrete component of this embodiment can be attached to the electromagnetic lifting equipment by magnetic adsorption after being magnetized, with high lifting efficiency. It is unnecessary to set embedded holes or connecting devices on the magnetic concrete component, thus avoiding local stress concentration of the magnetic concrete component.

[0031] Compared with the prior art, the magnetic concrete component provided in the present embodiment adds magnetic powder and mixture to the concrete component, and transforms the traditional concrete component into a magnetic concrete component 1. At this time, the magnetic concrete component 1 can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component 1 and install embedded parts, which reduces the difficulty of assembly and saves costs. The magnetic concrete component 1 will not be damaged due to local stress concentration, and the integrity of the magnetic concrete component 1 is ensured. The magnetic concrete component 1 is adsorbed and lifted by magnetic attraction, so that the prefabricated component can be uniformly stressed when lifting, and the point stress is converted into surface stress, which reduces the deformation and damage of the prefabricated component, reduces the defective rate, improves the quality of the magnetic concrete component 1, and saves manufacturing costs.

[0032] In some embodiments, the magnetic powder includes NdFeB magnetic powder and SrFeO magnetic powder, and the mass ratio of NdFeB magnetic powder to SrFeO magnetic powder is between 2:8 and 4:6. This ratio of magnetic powder can improve the magnetic properties of the magnetic powder after magnetization.

[0033] As a specific ratio of magnetic powder, the mass ratio of NdFeB magnetic powder to strontium ferrite magnetic powder is 2:8.

[0034] As another specific ratio of magnetic powder, the mass ratio of NdFeB magnetic powder to strontium ferrite magnetic powder is 3:7.

[0035] As another specific ratio of magnetic powder, the mass ratio of NdFeB magnetic powder to strontium ferrite magnetic powder is 4:7.

[0036] As another specific ratio of magnetic powder, the mass ratio of NdFeB magnetic powder to strontium ferrite magnetic powder is 4:6.

[0037] Based on the same inventive concept, the present invention also provides a method for manufacturing a magnetic concrete component, which is used to manufacture a magnetic concrete component as in any one of the above embodiments, comprising the following steps: mixing cement, magnetic powder, sand and coarse aggregate to form a semi-finished product; adding water, a water reducing agent and steel fiber to the semi-finished product to form a finished product; and curing the finished product to form a magnetic concrete component.

[0038] During specific implementation, water curing method is adopted for maintenance to ensure that the magnetic concrete components are stably formed.

[0039] Compared with the prior art, the method for manufacturing a magnetic concrete component provided in this embodiment adds magnetic powder and a mixture to a concrete component, thereby converting a traditional concrete component into a magnetic concrete component 1. At this time, the magnetic concrete component 1 can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component 1 and install embedded parts, thereby reducing the difficulty of assembly and saving costs. There will be no situation in which the magnetic concrete component 1 is damaged due to local stress concentration, thereby ensuring the integrity of the magnetic concrete component 1. The manufactured concrete component is magnetic and can be easily lifted.

[0040] In some embodiments, cement, magnetic powder, sand, coarse aggregate, water, water reducer and steel fiber are mixed according to the ratio of 100 parts of cement, 150-180 parts of magnetic powder, 100-120 parts of sand, 100-120 parts of coarse aggregate, 15kg / m3-45 kg / m3 of steel fiber and 1% of water reducer by mass to form a mixture, and the mixture is cured. This embodiment provides a specific ratio of the magnetic concrete component 1, and the produced magnetic concrete component 1 is of good quality and can be stably adsorbed and lifted by the electromagnetic crane 2 after magnetization. .

[0041] Based on the same inventive concept, refer to Figures 1 to 4 The present application also provides a magnetic concrete component hoisting method for hoisting a magnetic concrete component 1 as in any one of the above embodiments, characterized in that it comprises the following steps: S1: magnetizing the magnetic concrete component 1; S2: using an electromagnetic crane 2 to adsorb the magnetic concrete component and move it to a preset position for unloading; S3: pouring magnetic concrete slurry between the prefabricated concrete part and the reserved hole at the preset position; S4: demagnetizing the magnetic concrete component 1.

[0042] It should be noted that the magnetic concrete component 1 is used in building assembly construction, and the reserved position for building a building is generally reserved for production needs, with installation holes to facilitate the connection between the components.

[0043] It should be noted that the present invention can achieve uniform force when lifting the magnetic concrete component 1 by giving magnetism to concrete and using an electromagnetically controlled suction cup, which converts point force into surface force, reduces deformation and damage to the magnetic concrete component 1, and solves the stress concentration phenomenon existing in the traditional prefabricated building lifting process. There is no need to reserve lifting points and pre-embedded hooks for the magnetic concrete component 1, and the production process of the magnetic concrete component 1 is more convenient, and the integrity of the component is better. For the grouting work of reserved holes, screw holes, etc. in prefabricated buildings, the present invention uses the magnetism of the magnetic concrete component 1 itself to achieve the compactness of concrete pouring, and relies on the existence of magnetic force to make the poured concrete tightly and firmly fill the holes to prevent leakage. After the installer determines the position, the electromagnetic crane 2 can be magnetized instantly to achieve lifting by tight adsorption, and can be unloaded by instant demagnetization after being assembled to the predetermined position, with high installation efficiency; the magnetism of the prefabricated component itself can be mutually adsorbed and connected with the existing components, and the structure is safer and more reliable.

[0044] It should be noted that in order to ensure the integrity of the magnetic concrete component 1, some components are provided with reserved holes for easy overall connection, such as prefabricated wall panels, balconies, stairs and other components. During grouting, the magnetism they possess can be used to achieve tight filling of the slurry and reliable connection of the magnetic concrete component 1.

[0045] Compared with the prior art, the magnetic concrete component hoisting method provided in this embodiment adds magnetic powder and mixture to the concrete component, and transforms the traditional concrete component into a magnetic concrete component 1. At this time, the magnetic concrete component 1 can be magnetically attracted by a magnetic lifting device, and there is no need to drill holes in the magnetic concrete component 1 and install embedded parts, which reduces the difficulty of assembly and saves costs. There will be no local stress concentration that causes damage to the magnetic concrete component 1, and the integrity of the magnetic concrete component 1 is guaranteed; the magnetic concrete component 1 is adsorbed and lifted by magnetic attraction, which can achieve uniform force when the prefabricated component is lifted, and the point force is converted into surface force, which has less deformation and damage to the prefabricated component, reduces the defective rate, improves the quality of the magnetic concrete component 1, and saves manufacturing costs. The present application uses the principle of like poles repelling and opposite poles attracting to move the magnetic concrete component to the specified position through the electromagnetic crane 2. No mechanical connection is required during the loading and unloading process, which reduces the difficulty of assembly, and the speed of adsorption and repulsion is fast, which improves the assembly efficiency; during loading and unloading, the contact area between the magnetic concrete component 1 and the electromagnetic crane 2 is large, which improves the safety of assembly. The compactness of concrete pouring is achieved by utilizing the magnetism of the magnetic concrete component 1 itself, and the existence of magnetic force enables the poured concrete to fill the holes tightly and firmly, thereby preventing leakage.

[0046] In some embodiments, see Figure 2Step S1 is implemented based on the electromagnetic chuck 22. The electromagnetic chuck 22 is placed on the magnetic concrete component 1, and a current is applied to the electromagnetic chuck 22 to generate a strong magnetic field to magnetize the magnetic concrete component 1. In this embodiment, the electromagnetic chuck 22 generates a magnetic field after being energized, and the magnetic concrete component 1 mixed with magnetic powder will be magnetized, so that the magnetic concrete component 1 itself has magnetism, and the magnetic concrete component 1 can be adsorbed and fixed with the electromagnetic chuck 22, which is convenient for lifting and assembly.

[0047] It should be noted that Figure 2 The dashed lines in the figure refer to the magnetic field lines.

[0048] During specific implementation, the electromagnetic suction cup 22 is placed at the exact center of the magnetic concrete component 1 to ensure the stability of adsorption.

[0049] In some embodiments, see Figure 1 The electromagnetic crane 2 used in step S2 includes a lifting body 21 and an electromagnetic suction cup 22. The free end of the lifting body 21 can rotate freely, and the free end is connected to the electromagnetic suction cup 22; the electromagnetic suction cup 22 includes a shell, a controller, a coil and an iron core. The coil is wound around the outer circumference of the iron core. The iron core and the coil are arranged in the shell, and the shell is connected to the free end of the lifting body 21. The controller is arranged in the shell and is conductively connected to the coil and the power supply respectively.

[0050] This embodiment provides the main structure of the electromagnetic crane 2 used in this method, and the electromagnetic chuck 22 is driven to move freely in all directions by the lifting body 21, so that the magnetic concrete component 1 can be placed in a specified position, improving the installation accuracy and installation efficiency. The controller is powered on, and the control coil is powered on to generate an electromagnetic field. The controller can adjust the size of the magnetic field to achieve stable lifting of the magnetic concrete component 1.

[0051] It should be noted that magnetic fields with different polarities and different intensities can be generated according to the magnitude and direction of the current input to the controller.

[0052] In specific implementation, the lifting body 21 is a manipulator crane, which can rotate freely in any direction, such as a five-axis manipulator. The free end of the lifting body 21 is connected to the electromagnetic chuck 22, which is convenient for driving the electromagnetic chuck 22 to move.

[0053] In some embodiments, in step S2, before the magnetic concrete component 1 is moved to the preset position for unloading, the step further includes: positioning the magnetic concrete component 1 with the preset position. When the magnetic concrete component 1 is moved above the preset position, alignment is performed so that the magnetic concrete component 1 and the preset position can be quickly and accurately aligned, thereby improving assembly efficiency.

[0054] In specific implementation, the current in the electromagnetic chuck 22 is turned off by using a controller, so that the electromagnetic chuck 22 loses its magnetism, and the magnetic concrete component 1 is unloaded and falls off.

[0055] In some embodiments, accurately positioning the magnetic concrete component 1 at the preset position specifically includes: installing a magnetic alignment device 3 at the preset position, the middle magnetic pole of the magnetic alignment device 3 is the same as the magnetic pole of the magnetic concrete component 1, and when the magnetic concrete component 1 is aligned with the preset position, the magnetic alignment device 3 is removed.

[0056] This embodiment uses the principle that like repels like and opposites attract. During the alignment process, the magnetic poles of the magnetic alignment device 3 and the magnetic concrete component 1 are made the same. The magnetic alignment device 3 at the center first generates a magnetic field opposite to the magnetic concrete component 1 to achieve a millimeter-level suspended state. Once the centers coincide, the current direction of the electromagnetic suction cup 22 is immediately changed to adsorb the aligned magnetic concrete component 1, and finally the power is turned off and the device is removed to improve the alignment accuracy.

[0057] For specific implementation, see Figure 3 and Figure 4 The magnet alignment device 3 includes a circuit board 34, an electromagnet 33 arranged on the circuit board 34, a permanent magnet 31 and a sensor 32. There are four electromagnets 33. The sensor 32 is placed in the middle of the four electromagnets 33, and the permanent magnet 31 is sleeved on the outer periphery of the electromagnets 33. The magnetic poles of the permanent magnet 31 are opposite to the magnetic poles of the magnetic concrete component 1, and the magnetic poles of the four electromagnets 33 are the same as the magnetic poles of the magnetic concrete component 1. The sensor 32 has three directions: X-axis, Y-axis and Z-axis. It will output electrical signals in real time according to the different magnetic fields of the magnetic concrete component 1. The Z-axis is used to detect the strength of the magnetic field, and the X-axis and Y-axis are used to detect the magnetic field position.

[0058] In some embodiments, step S4 includes: using an alternating current demagnetization method to demagnetize the magnetic concrete component 1. The electromagnetic chuck 22 is connected to a controllable AC power supply, and the alternating electromagnetic field generated by the electromagnetic chuck 22 is used to disrupt the arrangement of magnetic domains inside the magnet. The electromagnetic chuck 22 magnetizes and demagnetizes the magnetic concrete component 1, and the functions are integrated, thereby improving the utilization of the electromagnetic chuck 22.

[0059] The following is a specific embodiment of the present application: The prefabricated magnetic concrete composite slab hoisting process includes the following steps: The magnetic concrete prefabricated composite slab is prepared, and magnetic powder and ferromagnetic materials are added to the conventional concrete for mixing and curing to prepare the magnetic concrete prefabricated composite beam.

[0060] The magnetic powder is composed of NdFeB magnetic powder and strontium ferrite magnetic powder, with a mass ratio of 2:8~4:6. The mass ratio of cement, sand, magnetic powder, coarse aggregate and water is 1:1:1.5:1:0.46. The mass fraction of water reducer is 1%. The steel fiber output is 20kg / m 3 , stir and mix all the components, then add water, water reducing agent and steel fiber to stir and shape.

[0061] After the laminated plate is cured and formed, it is magnetized, and a specific strong magnetic field is applied to the lifting force surface to magnetize it so that it has magnetism. The magnetic powder itself does not have magnetism. The present invention can magnetize its surface through friction contact magnetization generated by the strong magnetic field of the electromagnetic chuck, and the presence of steel bars and steel fibers will further enhance the magnetism of the test piece. The electromagnetically controlled magnetic chuck is used to lift the prefabricated components. When the electromagnetically controlled chuck is close to the prefabricated composite plate, the center of the electromagnetically controlled chuck detects the magnetic field strength and position based on the Hall sensor, and feeds back to the control system, applies a current of corresponding strength, and then applies a magnetic field to adsorb the composite plate.

[0062] The Hall sensor has three directions: X-axis, Y-axis, and Z-axis. It will output electrical signals in real time according to the different magnetic fields. The Z-axis is used to detect the strength of the magnetic field, and the X-axis and Y-axis are used to detect the position of the magnetic field.

[0063] Before approaching the predetermined position, a magnetic alignment device is installed at the center of the prefabricated composite plate to achieve precise positioning of the prefabricated components. The center is mainly used to detect whether the center of the floor slab coincides with the predetermined center. The magnetic alignment device at the center first generates a magnetic field opposite to the prefabricated composite plate to achieve a millimeter-level suspended state. Once the center coincides, the direction of the electromagnet current is immediately changed to adsorb the aligned composite plate, and finally the power is turned off and the device is removed.

[0064] After the same layer of composite slabs are in place, magnetic concrete slurry is poured to achieve tight filling. The structure relies on the existence of magnetic force to be safer and more reliable.

[0065] Demagnetize non-essential parts.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic concrete component, characterized in that: It is mainly formed by mixing cement, magnetic powder, sand, coarse aggregate, water, water reducing agent and steel fiber; wherein the mass ratio of the cement, the magnetic powder, the sand, the coarse aggregate and the water is 1:1:1.5:1:0.

46.

2. The magnetic concrete component according to claim 1, characterized in that: The magnetic powder includes neodymium iron boron magnetic powder and strontium ferrite magnetic powder, and the mass ratio of the neodymium iron boron magnetic powder to the strontium ferrite magnetic powder is between 2:8 and 4:

6.

3. A method for manufacturing a magnetic concrete component, used to manufacture the magnetic concrete component according to any one of claims 1 to 2, characterized in that: The following steps are involved: Mixing cement, magnetic powder, sand and coarse aggregate to form a semi-finished product; Adding water, a water reducing agent and steel fibers into the semi-finished product to form a finished product; The finished product is cured to form a magnetic concrete component.

4. The method for manufacturing a magnetic concrete component according to claim 3, characterized in that: The cement, the magnetic powder, the sand, the coarse aggregate, the water and the steel fiber are prepared in the following manner: 100 parts of cement, 150-180 parts of magnetic powder, 100-120 parts of sand, 100-120 parts of coarse aggregate, 15 kg / m of steel fiber. 3 ~45 kg / m 3 and a water reducing agent with a mass fraction of 1% are stirred to form a mixture.

5. A method for hoisting a magnetic concrete component, used for hoisting a magnetic concrete component as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S1: magnetizing the magnetic concrete component; S2: using an electromagnetic crane to absorb the magnetic concrete component and move it to a preset position for unloading; S3: pouring magnetic concrete slurry between the precast concrete part and the reserved hole at the preset position; S4: Demagnetizing the magnetic concrete component.

6. The method for hoisting a magnetic concrete component according to claim 5, characterized in that: Step S1 is implemented based on an electromagnetic chuck. The electromagnetic chuck is placed on the magnetic concrete component, and current is applied to the electromagnetic chuck to generate a strong magnetic field to magnetize the magnetic concrete component.

7. The method for hoisting a magnetic concrete component according to claim 5, characterized in that: The electromagnetic crane used in step S2 comprises a lifting body and an electromagnetic sucker, wherein the free end of the lifting body can rotate freely, and the free end is connected to the electromagnetic sucker; The electromagnetic suction cup includes a shell, a controller, a coil and an iron core. The coil is wound around the outer circumference of the iron core. The iron core and the coil are arranged in the shell. The shell is connected to the free end of the lifting body. The controller is arranged in the shell and is conductively connected to the coil and the power supply respectively.

8. The method for hoisting a magnetic concrete component according to claim 5, characterized in that: In step S2, before moving to the preset position for unloading, the process further includes: The magnetic concrete component is positioned at a preset position.

9. The method for hoisting a magnetic concrete component according to claim 8, characterized in that: The method of accurately positioning the magnetic concrete component at a preset position specifically includes: A magnet alignment device is installed at a preset position, wherein the middle magnetic pole of the magnet alignment device is the same as the magnetic pole of the magnetic concrete component; When the magnetic concrete component is aligned with the preset position, the magnetic alignment device is removed.

10. The method for hoisting a magnetic concrete component according to claim 5, characterized in that: Step S4 includes: demagnetizing the magnetic concrete component by using an alternating current demagnetization method.

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