A method for preparing and constructing underwater non-stirring magnetic reinforced concrete

Abstract

The present invention provides an underwater non-stirring magnetic reinforced concrete preparation and construction method, comprising the following steps: step 1, preparing magnetic aggregates; step 2, tying steel bars on the ground according to the size of components, prefabricating component templates according to design requirements, then encapsulating the component templates outside the steel skeleton to form a component mold, filling the magnetic aggregates prepared in step 1 into the component mold, and preliminarily forming a prefabricated skeleton; step 3, arranging a construction surface underwater according to design requirements, hoisting the prefabricated skeleton prepared in step 2 into the construction surface, removing the component template at the bottom of the prefabricated skeleton, and completing underwater pre-embedding and installation; step 4, preparing magnetic slurry, injecting the magnetic slurry into the prefabricated skeleton, and removing the component template after the magnetic slurry solidifies. This method does not require the mixing of aggregates with water and cement, overcomes the shortcomings of ordinary concrete, such as poor water washing resistance, easy environmental pollution, and high requirements for special equipment, and can be directly cast in water without being easily dispersed and segregated.

Description

Technical Field

[0001] The invention relates to the field of concrete preparation and construction, and in particular to an underwater non-stirring magnetic reinforced concrete preparation and construction method. Background Art

[0002] In order to meet various requirements for underwater buildings and obtain benefits in irrigation, power generation, living, transportation and other aspects, underwater buildings have received unprecedented attention. Naturally, the preparation and construction technology of underwater concrete has become the top priority in its development process. Experts and scholars at home and abroad have conducted research and analysis on its chemical and mechanical properties such as anti-corrosion, anti-dispersion, anti-scouring, anti-freezing and dry-wet, tensile strength, and abrasion resistance.

[0003] Traditional underwater concrete is concrete that is mixed in a dry place and poured and hardened underwater. Although concrete can solidify and harden underwater, the pouring quality is poor. Therefore, underwater pouring is only adopted when it is necessary or in the underwater parts of some minor buildings. Due to the complexity of the underwater environment, the requirements for underwater concrete pouring are high, and it must have the characteristics of underwater non-separation, self-compactness, low water seepage and slow setting. When pouring underwater concrete, the mixture should avoid contact with environmental water before entering the warehouse surface; after entering the warehouse surface, the concrete in contact with water is always in contact with water, and the concrete poured later is no longer in contact with water. The concrete should have sufficient fluidity to resist water seepage and separation stability, and must be carried out in a cofferdam that can prevent the influence of running water. The pouring must not be interrupted and should be carried out as soon as possible. This is also the limitation of traditional underwater concrete pouring. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an underwater non-stirring magnetic reinforced concrete preparation and construction method, which does not require the mixing of aggregates, water and cement, overcomes the shortcomings of ordinary concrete such as poor water washing resistance, easy environmental pollution, and high requirements for special equipment. It can be directly poured in water and is not prone to dispersion and segregation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an underwater non-stirring magnetic reinforced concrete preparation and construction method, comprising the following steps:

[0006] Step 1, preparing magnetic aggregate;

[0007] Step 2: Tie steel bars on the ground according to the size of the component, prefabricate the component template according to the design requirements, then encapsulate the component template outside the steel frame to form a component mold, fill the magnetic aggregate prepared in step 1 into the component mold, and preliminarily shape it to form a prefabricated frame;

[0008] Step 3: Arrange the construction surface underwater according to the design requirements, hoist the prefabricated frame prepared in step 2 into the construction surface, remove the component template at the bottom of the prefabricated frame, and complete the underwater embedding and installation;

[0009] Step 4: prepare magnetic slurry and inject it into the prefabricated frame. After the magnetic slurry solidifies, remove the component template.

[0010] In a preferred embodiment, in step 1, the preparation of magnetic aggregate includes the following steps:

[0011] S1. Evenly mix NdFeB powder, water and cement to make a magnetizing liquid;

[0012] S2, collecting ceramsite, and pressing the magnetizing liquid prepared in S1 into the ceramsite by adjusting the vacuum pressure through a high-pressure vacuum suction device and a high-pressure injection device to prepare aggregate;

[0013] S3. Adjust the magnetic induction intensity of the magnetizer to strongly magnetize the aggregate made in S2 to make magnetic aggregate with a strong magnetic field.

[0014] In a preferred embodiment, in S1, the mass ratio of NdFeB powder, water and cement is 3-5:1:1.

[0015] In a preferred embodiment, in step 4, the magnetic slurry includes oily epoxy resin, curing agent, fly ash, iron powder and active diluent.

[0016] In a preferred embodiment, the mass ratio of the oily epoxy resin, the curing agent, the fly ash, the iron powder and the reactive diluent is 100:50:80~100:80~100:9~12.

[0017] In a preferred solution, in step 4, the prepared magnetic slurry is pumped into the prefabricated skeleton by a grouting pump connected to a grouting pipe, and the grouting pipe is connected to the grouting holes on the component template of the prefabricated skeleton.

[0018] In a preferred solution, in the step 2, a connection port is provided on the component template on one side of the component mold.

[0019] In a preferred solution, in step three, when the prefabricated frame is connected to other components, a sealing strip is provided at the connection position.

[0020] The invention provides an underwater non-stirring magnetic reinforced concrete preparation and construction method, which has the following beneficial effects:

[0021] 1. After injecting magnetizing liquid into the porous ceramsite and then charging it with strong magnetism, the aggregates have a strong adsorption force, so the prefabricated skeleton formed has higher strength. In addition, the porous ceramsite is low-cost and easy to obtain, which greatly reduces the cost of raw materials.

[0022] 2. Pre-tie the internal steel bars of the structure, and then use the component template to connect to the outside of the steel bars to make a corresponding structural support system. Pour the expanded clay with strong magnetism into the structure. Due to the existence of the magnetic field, there is a strong adsorption effect between the steel bars and the expanded clay, and between the expanded clay and the expanded clay. After entering the underwater environment, it can adapt to more complex underwater superimposed loads.

[0023] 3. After the prefabricated skeleton prepared above is placed into the predetermined underwater working surface by a hoisting machine, the prepared magnetic slurry is pumped into the skeleton through a pumping device because there are pores between the magnetized expanded clay and the expanded clay. Since the magnetic slurry has good fluidity and anti-dispersion properties, it can evenly fill the entire prefabricated skeleton and form a basic component with a smooth surface under the support of the formwork, and it can be consolidated in a relatively short time, overcoming the shortcomings of ordinary concrete such as poor water washing resistance, easy environmental pollution, and high requirements for special equipment. It can be directly poured in water, is not prone to dispersion and segregation, and can also ensure the quality and strength of the poured concrete.

[0024] 4. Compared with the traditional construction method, it is not necessary to mix aggregates with water and cement, and there is no need to consider the segregation of underwater concrete slurry and aggregates. Compared with the many unstable factors of traditional concrete underwater, this patent greatly improves the convenience of underwater construction, saves manpower and material resources, and makes its construction more feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 Prepare a process flow chart for magnetic aggregate;

[0027] Figure 2 This is a working schematic diagram of the magnetizing device of the present invention;

[0028] Figure 3 Create a flow chart for prefabricated skeletons;

[0029] Figure 4 This is a general diagram of the underwater installation construction and grouting process of the present invention;

[0030] In the figure: magnetic aggregate 1, expanded clay 2, magnetizing liquid 3, vacuum suction device 4, high-pressure injection device 5, magnetizer 6, magnetizing bin 8, component formwork 9, steel bar skeleton 10, prefabricated skeleton 11, connection port 12, grouting pump 13, grouting pipe 14, sealing strip 15, magnetic slurry 16. DETAILED DESCRIPTION

[0031] An underwater non-stirring magnetic reinforced concrete preparation and construction method comprises the following steps:

[0032] Step 1: Prepare magnetic aggregate 1.

[0033] The preparation of magnetic aggregate 1 comprises the following steps:

[0034] S1. Evenly mix NdFeB powder, water and cement to make magnetizing liquid 3. Evenly mix NdFeB powder, water and cement in a ratio of 5:1:1.

[0035] S2, collecting ceramsite 2, which has tiny pores, and pressing the magnetizing liquid 3 prepared in S1 into the ceramsite 2 through a high-pressure vacuum suction device 4 and a high-pressure injection device 5 to adjust the vacuum pressure to prepare aggregate.

[0036] like Figure 1 As shown, the magnetizing liquid 3 is pressed into the pores of the ceramsite by a vacuum suction device and a vacuum injection device, and the magnetizing liquid 3 and the ceramsite 2 form a new type of aggregate.

[0037] S3, such as Figure 2 As shown, the aggregate made of S2 is strongly magnetized and placed in the magnetizing bin 8, and the magnetic induction intensity of the magnetizer 6 is adjusted to strongly magnetize the aggregate made of S2 to produce a magnetic aggregate 1 with a strong magnetic field.

[0038] The aggregates prepared by S2 can generate strong magnetic induction under the action of the magnetizer 6, and the aggregates can attract and bond to each other under the action of the magnetic field.

[0039] Step 2: Figure 3 As shown, steel bars are tied on the ground according to the size of the component to form a steel skeleton 10, and a component template 9 is prefabricated according to the design requirements. The component template 9 is then encapsulated outside the steel skeleton 10 to form a component mold, and the magnetic aggregate 1 prepared in step 1 is filled into the component mold and preliminarily formed to form a prefabricated skeleton 11. The prefabricated skeleton 11 is formed by bonding ceramsite with magnetic liquid, and is tightly adsorbed with the steel bars, so it has a porous property.

[0040] The component template 9 can be a waterproof template. According to the design requirements, the component template 9 can be assembled into components of different shapes. The component template 9 on one side of the component mold is pre-arranged with a grouting port to facilitate connection with the grouting pipe 14.

[0041] The component template 9 on one side of the component mold is provided with a connection port 12. On the one hand, it is convenient to fill the magnetic aggregate 1, and on the other hand, it is convenient to connect with other underwater components. The setting position of the connection port 12 is determined according to the connection position with other components.

[0042] During actual use, waterproof seals can be used to tightly seal the joints between the component templates to prevent the leakage of slurry.

[0043] Step 3: Figure 4As shown, a construction surface is arranged underwater according to the design requirements, the prefabricated frame 11 prepared in step 2 is hoisted into the construction surface, hoisted by a crane, and the component template 9 at the bottom of the prefabricated frame 11 is removed to complete the underwater pre-embedding. When it is necessary to connect with other components, the steel frame 10 of the connection port 12 of the prefabricated frame 11 is connected with other components, and a sealing strip 15 can be set at the connection position to prevent the slurry from leaking.

[0044] Step 4: prepare magnetic slurry 16, inject the magnetic slurry 16 into the prefabricated frame 11, and remove the component template 9 after the magnetic slurry solidifies.

[0045] The magnetic slurry 16 includes oily epoxy resin, curing agent, fly ash, iron powder and active diluent, wherein the mass ratio of the oily epoxy resin, curing agent, fly ash, iron powder and active diluent is 100:50:80:100:9.

[0046] The magnetic slurry 16 has good properties of being adsorbed by magnets, and has good anti-dispersion properties and good guidance in underwater environments. After being poured into the underwater skeleton, it can be cemented and formed in a short time. The oily epoxy resin has good hydrophobicity and a water content of almost 0. The iron powder and the magnetic material are better adsorbed and bonded. The active diluent can participate in the curing reaction, reduce the viscosity of the epoxy resin, and make the cured product have a higher cross-linking density.

[0047] The prepared magnetic slurry 16 is pumped into the prefabricated skeleton 11 by a grouting pump 13 connected to a grouting pipe 14 , and the grouting pipe 14 is connected to the grouting holes on the component template 9 of the prefabricated skeleton 11 .

[0048] The magnetic slurry 16 is adsorbed around the magnetic ceramsite under the strong magnetic field. The prefabricated skeleton 11 is made of ceramsite bonded with magnetic liquid and tightly adsorbed with the steel bars, so it has a porous nature. Under the support and shaping effect of the component template 9, after the magnetic slurry 16 is injected, it can evenly fill every pore in the skeleton from top to bottom, and closely combine with the skeleton with a magnetic field to ensure the strength and coagulation requirements. Finally, a component with corrosion resistance, smooth surface, complete structure and certain bearing capacity is formed.

[0049] This construction method injects magnetic liquid into the expanded clay and then strongly magnetizes it. The aggregates have a strong adsorption force, and the prefabricated skeleton formed has higher strength. The expanded clay with strong magnetism is poured into the component mold. Due to the existence of the magnetic field, there is a strong adsorption effect between the steel bars and the expanded clay, and between the expanded clay and the expanded clay. After entering the underwater environment, it can adapt to more complex underwater superimposed loads.

[0050] After the prefabricated skeleton 11 is placed into the predetermined underwater working surface by a hoisting machine, the configured magnetic slurry 16 is pumped into the skeleton by a pumping device due to the pores between the magnetized expanded clay and the expanded clay. Since the magnetic slurry 16 has good fluidity and anti-dispersion properties, it can evenly fill the entire prefabricated skeleton 11 and form a basic component with a smooth surface under the support of the formwork, and can be consolidated in a relatively short time, overcoming the shortcomings of ordinary concrete such as poor water washing resistance, easy environmental pollution, and high requirements for special equipment. It can be directly poured in water, is not prone to dispersion and segregation, and can also ensure the quality and strength of the poured concrete.

[0051] Compared with traditional construction methods, there is no need to mix aggregates with water and cement, and there is no need to consider the segregation of underwater concrete slurry and aggregates. Compared with the many unstable factors of traditional concrete underwater, it greatly improves the convenience of underwater construction, saves manpower and material resources, and makes its construction more feasible.

Claims

1. An underwater non-stirring magnetic reinforced concrete preparation and construction method, characterized in that: The steps include: Step 1: preparing magnetic aggregate, comprising the following steps: S1. Evenly mix NdFeB powder, water and cement to make a magnetizing liquid; S2, collecting ceramsite, and pressing the magnetizing liquid prepared in S1 into the ceramsite by adjusting the vacuum pressure through a high-pressure vacuum suction device and a high-pressure injection device to prepare aggregate; S3, adjust the magnetic induction intensity of the magnetizer, and strongly magnetize the aggregate made in S2 to make a magnetic aggregate with a strong magnetic field; Step 2: Tie steel bars on the ground according to the size of the component, prefabricate the component template according to the design requirements, then encapsulate the component template outside the steel frame to form a component mold, fill the magnetic aggregate prepared in step 1 into the component mold, and preliminarily shape it to form a prefabricated frame; Step 3: Arrange the construction surface underwater according to the design requirements, hoist the prefabricated frame prepared in step 2 into the construction surface, remove the component template at the bottom of the prefabricated frame, and complete the underwater embedding or installation; Step 4: prepare magnetic slurry and inject it into the prefabricated frame. After the magnetic slurry solidifies, remove the component template.

2. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 1, characterized in that: In the S1, the mass ratio of NdFeB powder, water and cement is 3-5:1:

1.

3. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 1, characterized in that: In the step 4, the magnetic slurry includes oily epoxy resin, curing agent, fly ash, iron powder and active diluent.

4. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 3, characterized in that: The mass ratio of oily epoxy resin, curing agent, fly ash, iron powder and active diluent is 100:50:80~100:80~100:9~12.

5. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 1, characterized in that: In the step 4, the prepared magnetic slurry is pumped into the prefabricated frame by a grouting pump connected to a grouting pipe, and the grouting pipe is connected to the grouting holes on the component template of the prefabricated frame.

6. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 1, characterized in that: In the step 2, a connection port is provided on the component template on one side of the component mold.

7. The method for preparing underwater non-stirring magnetic reinforced concrete according to claim 1, characterized in that: In the step three, when the prefabricated frame is connected to other components, a sealing strip is provided at the connection position.

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