CN105587125A - Method for pouring concrete based on magnetic drive - Google Patents

Abstract

The invention provides a method for pouring concrete based on magnetic drive. The method is based on the principle that magnetic substances are subjected to electromagnetic force in an electromagnetic field. By deploying a suitable proportion of concrete containing ferromagnetic aggregates, and using an external magnetic field to drive the concrete in Uniform flow within the component to achieve dense pouring. The pouring method provided by the invention can get rid of the constraints of gravity, realize all-round concrete pouring, greatly improve the pouring quality, and has strong versatility, and can be widely used in various pouring construction schemes.

Description

A method of pouring concrete based on magnetic drive

technical field

The invention relates to the field of building construction, in particular to a method for pouring concrete based on magnetic drive.

Background technique

In the construction of modern construction projects, concrete pouring technology is an important content of construction technology management. It is the key to affecting the stability of building structures and the quality of building concrete construction. Strengthening the improvement of concrete pouring technology is very important. In the concrete pouring technology, there are two common concrete pouring methods: one is the artificial natural pouring method, which is poured downwards based on the principle of gravity, such as beams, columns, walls and other components. Vertically downward, the magnitude of the acceleration of gravity is also constant, so the pouring direction and pouring range of concrete are also limited, and the requirements for the fluidity of the poured concrete are also high. Another jacking method is based on the pump pressure difference to lift the pouring, that is, to open a hole in the lower part of the steel pipe column, and connect the outlet of the concrete delivery pump with the delivery pipe, and the concrete is continuously injected into the steel column through the delivery pipe under the influence of the pump pressure , until the column is filled with concrete; for example, the Chinese invention patent application number 200510000598.5 discloses a lightweight concrete pumping method and equipment. Although this pouring method utilizes the pump pressure of the concrete delivery pump to drive the concrete, it is still The compactness of the concrete itself is achieved by the action of gravity, so the concrete is also required to have high fluidity.

To sum up, the existing pouring methods are all based on gravity control to drive concrete, so the applicable objects of pouring are limited, and they are limited to vertical components. For horizontal components (such as horizontal steel pipe components), the existing pouring methods have the following technical defects: ① Horizontal steel pipes are open at both ends and closed in the middle, and the flow of concrete is not affected by gravity during pouring, so it is not suitable for artificial Natural pouring method; ②The jacking method can only be driven at the entrance of the concrete, and it is difficult to drive the concrete to flow laterally in the steel pipe, and the concrete is not evenly distributed in the steel pipe, so it cannot be poured densely, so the jacking method is not suitable.

Therefore, how to adopt a convenient and effective pouring method to horizontally pour concrete on components is a technical problem urgently needed to be solved by those skilled in the art.

Contents of the invention

The invention provides a method for pouring concrete based on magnetic drive. By adding ferromagnetic aggregates to the concrete, the concrete is driven to flow laterally and compactly poured based on the principle of a magnetic field, thereby solving the above-mentioned defects in the prior art.

The technical scheme adopted in the present invention is specifically as follows:

A method for pouring concrete based on magnetic drive, comprising the steps of:

(1) Add the ferromagnetic aggregate to the concrete in proportion, and stir evenly with the mixer for 2 minutes;

(2) Set up a magnetic field on the periphery of the component to be poured, a magnetic induction device is connected to one end of the component to be poured, and the magnetic field power supply is turned on, so that the magnetic field lines in the magnetic field are concentrated in the component to be poured;

(3) Add the concrete obtained in step (1) from the other end of the component to be poured, and control the magnetic field current and magnetic induction intensity, so that the concrete flows evenly in the component;

(4) When the concrete evenly covers the entire pouring space, turn off the power supply of the magnetic field and check the compactness of the pouring.

Preferably, in step (1), the proportion of ferromagnetic aggregate in concrete is at least 50%.

More preferably, in the ferromagnetic aggregate, the proportion of the ferromagnetic substance in the aggregate is 25-100%.

Preferably, in step (1), the ferromagnetic aggregate is uniformly distributed in the concrete, and forms good bonding with other components of the concrete.

Preferably, the ferromagnetic aggregate is one or more of steel slag, iron powder, magnetite, waste furnace slag and the like.

Preferably, in step (1), the slump of the concrete is at least 10mm.

Preferably, in step (2), the magnetic field is formed by a coil, a coil frame, a shell and a steel end plate, wherein the coil is wound on the coil frame, the coil frame is wrapped in the shell, and the shell is fixed on the outer periphery of the component to be poured through the steel end plate .

Preferably, in step (2), the magnetic field force generated by the ferromagnetic aggregate in the magnetic field satisfies the following conditions: cohesion between concrete particles<magnetic field force<critical segregation force of concrete.

Preferably, in step (2), the erected magnetic field is a single magnetic field, or a superposition of multiple magnetic fields.

In the present invention, the coarse and fine aggregates of the concrete adopt ferromagnetic substances, such as steel slag or iron powder. Ferromagnetic aggregate is uniformly mixed with cement, water and ordinary sand in proportion to form concrete. When the concrete has fluidity, a magnetic field is generated by a magnetic force generator to control the movement center of ferromagnetic aggregate in the magnetic field, and use The bonding force between ferromagnetic aggregate and other components of concrete moves the concrete to the place where it needs to be poured. Since the direction of the magnetic field can be artificially designed, the external magnetic field (including a single magnetic field or the superposition of multiple magnetic fields) can also move, so that it can achieve all-round concrete pouring without the constraints of gravity. The magnetic field acts on the concrete evenly through each ferromagnetic aggregate, and the magnitude of the applied magnetic field force can be controlled, which can exceed the action of gravity, thereby reducing the requirement for the fluidity of the concrete.

In summary, the pouring method provided by the present invention is innovative in that:

1. Different from the principle of gravity control in the prior art, this method is based on the principle that magnetic substances are subjected to electromagnetic force in an electromagnetic field, and the pouring purpose is achieved by magnetically driving concrete;

2. The ferromagnetic aggregate concrete with the optimal ratio is used to fully bond the ferromagnetic aggregate with other components in the concrete, and the slump of the concrete obtained in step (1) is at most 10mm, which is better than the existing ones. Concrete (the slump of ordinary concrete is 30 ~ 50mm), so the concrete of the present invention can flow evenly under the action of the magnetic field, dense pouring, greatly improving the quality of pouring;

3. This method does not need to insert the equipment into the component, and directly acts on the concrete inside the component through the magnetic field and magnetic induction device installed outside the component, which is convenient to use and saves time and effort;

4. This method has strong versatility and is not only suitable for pouring horizontally placed components, but also suitable for pouring vertically placed or other arbitrary angled components; it can overcome the influence of concrete gravity during pouring, and the existing technical pouring The technical defects of poor concrete fluidity and low compactness can be widely used in various pouring construction schemes.

Description of drawings

Fig. 1 is a structural schematic diagram of a magnetically driven concrete pouring device in a simulation experiment of the present invention.

Fig. 2 is a pouring effect diagram of the present invention in a simulation experiment.

detailed description

The embodiment of the present invention is a simulation experiment for actual engineering application. The specific experimental device is shown in Figure 1, wherein: serial number 1 indicates the coil, serial number 2 indicates the coil steel pipe shell, serial number 3 indicates the steel end plate, and serial number 4 indicates the coil skeleton (Non-metal), No. 5 means steel mandrel, No. 6 means copper bolt, No. 7 means plexiglass tube (placed horizontally), No. 8 means ferromagnetic aggregate concrete.

For the above components, No. 7 simulates the component to be poured; No. 1 to 4 simulates the magnetic field erected on the outer periphery of the component, and the coil 1 is wound on the bobbin 4, and the bobbin 4 is wrapped in the shell 2, and the shell 2 is fixed by the steel end plate 3 On the periphery of the component 7 to be poured; serial numbers 5-6 simulate a magnetic induction device, the steel mandrel 5 is installed on one end of the plexiglass tube 7, and is threaded with the plexiglass tube 7 through copper bolts 6; the concrete 8 is in the plexiglass tube 7 pouring.

Below, the construction steps of pouring concrete in the plexiglass tube 7 will be introduced in detail in the simulation experiment:

(1) mixing concrete

Ferromagnetic aggregate (such as steel slag) is used as coarse aggregate, and the concrete is uniformly mixed. The ratio of each component in the concrete is: cement: steel slag: sand: water = 1:3.0:1.6:0.45, and the slump of the concrete is 10mm.

(2) Assemble the magnetic pouring device

The plexiglass tube 7 (diameter is 80mm) is horizontally inserted into the device, and the steel mandrel 5 (i.e. the magnetic induction device) connected with the copper bolt 6 is placed on the right end of the plexiglass tube 7 to reduce the air gap; A magnetic field is erected on the periphery of the device, and the power supply of the magnetic field is turned on, so that the magnetic field lines are concentrated in the plexiglass tube 7, which can reduce the magnetic flux leakage phenomenon of the device and increase the electromagnetic attraction force. The controller controls the input current and adjusts the corresponding magnetic induction intensity to meet the pouring requirements.

(3) Pouring concrete

Add the concrete stirred in step (1) from the left end of the plexiglass tube 7, and control the magnetic field current and magnetic induction intensity, so that the concrete flows horizontally and evenly to the right in the component under the action of the magnetic field force, and the purpose of pouring is realized.

(4) Check the compactness of concrete pouring

After the concrete evenly covers the entire pouring space, turn off the magnetic field power supply, take out the plexiglass tube 7, and check the compactness of pouring. Observation found that the concrete poured inside the plexiglass tube 7 has good compactness, and the pouring effect is shown in FIG. 2 . Therefore, the simulation experiment verified the feasibility of the pouring method provided by the present invention.

It should be emphasized that in the above construction steps, the proportions of the concrete components are only reference examples, and can be adjusted in any proportion according to the actual situation, as long as the ferromagnetic aggregate accounts for more than 50% of the total proportion of the concrete. In addition, ferromagnetic aggregates can be all magnetic substances (that is, the specific gravity accounts for 100%), and can also be partly non-magnetic substances and partly magnetic substances; however, through experimental verification by the inventor, it is found that under the action of a magnetic field, Ferromagnetic aggregate not only needs to overcome its own gravity, but also drives other non-ferromagnetic concrete paste in the concrete to move together, so it must be able to overcome the average gravity of aggregate and concrete paste, and distribute to each ferromagnetic aggregate The average magnetic driving force cannot be greater than the cohesive force between the aggregate and the concrete slurry, otherwise aggregate segregation will occur; through repeated experiments and demonstrations by the inventor, it can be known that when the proportion of the magnetic material to the ferromagnetic aggregate is more than 25% , When the gradation is good, the pouring effect is remarkable.

Claims (9)

1. A method for pouring concrete based on magnetic drive, comprising the steps of: (1) Add the ferromagnetic aggregate to the concrete in proportion, and stir evenly with the mixer for 2 minutes; (2) Set up a magnetic field on the periphery of the component to be poured, a magnetic induction device is connected to one end of the component to be poured, and the magnetic field power supply is turned on, so that the magnetic field lines in the magnetic field are concentrated in the component to be poured; (3) Add the concrete obtained in step (1) from the other end of the component to be poured, and control the magnetic field current and magnetic induction intensity, so that the concrete flows evenly in the component; (4) When the concrete evenly covers the entire pouring space, turn off the power supply of the magnetic field and check the compactness of the pouring. 2. The method for pouring concrete based on magnetic drive according to claim 1, characterized in that, in the step (1), the proportion of ferromagnetic aggregate in concrete is at least 50%. 3. The method for pouring concrete based on magnetic drive according to claim 2, characterized in that, in the ferromagnetic aggregate, the proportion of ferromagnetic substances in the ferromagnetic aggregate is 25%-100%. 4. The method for pouring concrete based on magnetic drive according to claim 1, characterized in that, in the step (1), the ferromagnetic aggregate is evenly distributed in the concrete and forms a good bond with other components of the concrete. 5. The method for pouring concrete based on magnetic drive according to any one of claims 1 to 4, wherein the ferromagnetic aggregate is one of steel slag, iron powder, magnetite, waste furnace slag, etc. species or several. 6. The method for pouring concrete based on magnetic drive according to claim 1, characterized in that, in the step (1), the slump of the concrete is at least 10 mm. 7. The method for pouring concrete based on magnetic drive according to claim 1, characterized in that, in the step (2), the magnetic field is formed by a coil, a bobbin, a shell and a steel end plate, wherein the coil is wound As for the coil frame, the coil frame is wrapped in the shell, and the shell is fixed on the outer periphery of the component to be poured through the steel end plate. 8. The method for pouring concrete based on magnetic drive according to claim 1 or 7, characterized in that, in the described step (2), the magnetic field force generated by the ferromagnetic aggregate in the magnetic field satisfies the condition that the concrete particles Inter-cohesion < magnetic field force < critical force of concrete segregation. 9. The method for pouring concrete based on magnetic drive according to claim 1 or 7, characterized in that, in the step (2), the erected magnetic field is a single magnetic field, or a superposition of multiple magnetic fields.