CN117383867A - A concrete structure with reinforced protective layer for viaduct piers - Google Patents

Abstract

The invention relates to the field of viaduct pier manufacturing, specifically to a viaduct pier reinforced concrete protective layer concrete structure, which includes a reinforced cage. A concrete layer is poured on the outside of the reinforced cage; the concrete layer includes 100 to 160 parts of modified cement, 200-300 parts of aggregate, 100-200 parts of steel fiber, 20-60 parts of reinforced resin, 10-30 parts of hydrophobic agent, 20-60 parts of water-reducing agent, 10-20 parts of sealing agent, 10-20 parts of antifreeze . The aggregate in the present invention uses coarse aggregate with a more uniform particle size, without mixing any fine aggregate, so that the water permeability and air permeability of the concrete are better, and the coarse aggregate, modified cement, steel fiber and reinforced resin are mixed with each other. Improve the overall strength of concrete, improve the carbonation resistance and chloride ion corrosion resistance of the viaduct pier concrete layer, and extend the service life of the viaduct pier.

Description

A concrete structure with reinforced protective layer for viaduct piers

Technical field

The invention relates to the technical field of viaduct pier manufacturing, specifically to a viaduct pier reinforced concrete protective layer concrete structure.

Background technique

Viaduct, a bridge with high supporting towers or pillars, spanning a valley, river, road or other low obstacle. After urban development, traffic is congested, buildings are dense, and streets are difficult to widen. The use of this kind of bridge can disperse traffic density and improve transportation efficiency. In addition, on inter-city highways or railways, in order to avoid horizontal intersections with other lines, save land, and reduce roadbed subsidence, this type of bridge can be used instead of embankments.

Bridge piers are mainly used to support the bridge span structure. When constructing bridge piers, they are often formed by wrapping steel bars in molds and pouring concrete to harden them. Concrete is one of the main materials for viaduct piers. It has the characteristics of rich raw materials, low price, and simple production process, which makes it easy to use. getting bigger. At the same time, concrete also has the characteristics of high compressive strength, good durability, and a wide range of strength levels.

In recent years, with the development of economy, the weight of viaducts has also increased. The strength of traditional concrete is difficult to meet the standards for viaduct pier construction. It is necessary to continue to develop new high-strength concrete to meet the requirements of viaduct piers on concrete strength and tear resistance. requirements.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a concrete structure with a reinforced protective layer for viaduct piers.

In order to solve the above technical problems, the present invention provides a viaduct pier reinforced concrete protective layer concrete structure, which includes a reinforced cage with a concrete layer poured on the outside of the reinforced cage;

The concrete layer includes 100-160 parts of modified cement, 200-300 parts of coarse aggregate, 100-200 parts of steel fiber, 20-60 parts of reinforced resin, 10-30 parts of hydrophobic agent, and 20-60 parts of water-reducing agent. , 10 to 20 parts of sealing agent, 10 to 20 parts of antifreeze.

Preferably, the preparation method of the concrete layer includes the following steps:

Step 1: Weigh each component according to the proportion. When feeding, first add modified cement, coarse aggregate, modified steel fiber, add 30 to 50% of the total water, and stir for 2 to 4 seconds at 1000 to 3000 rpm. minute;

Step 2: Add hydrophobic agent and stir at 1000-3000 rpm for 2-4 minutes. Add sealing agent and stir at 1000-3000 rpm for 2-4 minutes;

Step 3: Then add water-reducing agent and antifreeze, stir at 1000-3000 rpm for 20-30 minutes, and discharge.

Preferably, the preparation method of modified cement includes the following steps:

S1. Disperse Li-A l layered double metal hydroxide powder and acidic retarder in ethanol liquid to form a mixed suspension for later use;

S2. Collide the atomized mixed suspension with the cement particles carried by the hot carrier gas, so that the mixed suspension is sprayed onto the surface of the cement particles, and the ethanol on the surface of the cement particles is evaporated under the action of the hot carrier gas to obtain the above Modified cement.

Preferably, the temperature of the hot carrier gas is between 120°C and 200°C, and the acidic retarder is one or a combination of boric acid, citric acid, and tartaric acid.

Preferably, the preparation method of coarse aggregate includes the following steps:

S1. Soak the coarse aggregate in water and add nano-silica powder. The weight ratio of coarse aggregate to nano-silica powder is (5~7):1. Stir the coarse aggregate and nano-silica powder. Mix thoroughly to obtain mixed coarse aggregate;

S2. Place the mixed coarse aggregate in a carbonization furnace at 300-500°C and heat it for 2-3 hours to obtain carbonized mixed coarse aggregate;

S3. Take out the coarse aggregate for crushing.

Preferably, the reinforced resin is one or a combination of sodium polyacrylate resin, melamine resin, and carboxymethylcellulose grafted acrylic water-absorbent resin. The reinforced resin needs to undergo a polymerization treatment before being added to concrete. Polymerization treatment can improve the water retention and water absorption capacity of the reinforced resin, allowing the concrete layer to maintain stable performance for a long time.

Preferably, the water-reducing agent is one or a combination of one or more of polycarboxylate water-reducing agents, naphthalene-based water-reducing agents, aliphatic water-reducing agents, and sulfamic acid water-reducing agents. The water reduction rate is not less than 30%.

Preferably, the steel fiber is selected from one or more of ordinary steel fiber, stainless steel fiber and aluminum fiber. After the steel fiber is added, the interface between the steel fiber and the concrete matrix is bonded, thereby improving the strength and crack resistance of the concrete layer. Performance, steel fiber needs to be annealed. After the steel fiber is annealed, the internal grains are refined and the grain boundaries are increased, resulting in a fine-grain strengthening effect and improving the tensile strength of the steel fiber.

Preferably, the preparation method of the sealing agent includes the following steps: slurry 20 to 30 parts of silica powder, turn on the mixer, add 2 to 5 parts of long-chain carbonic acid, and stir at 3000 to 6000 rpm for 5 to 8 minutes. , then add 6 to 8 parts of microcapsule sealing agent and 9 to 12 parts of chitosan, and stir at 1000 to 2000 rpm for 20 to 40 minutes to obtain a sealing agent.

Preferably, the steel cage includes a plurality of vertical main bars, the plurality of vertical main bars are distributed according to the shape of the outer contour of the viaduct pier, the outer surfaces of the plurality of vertical main bars are bundled with stirrups at equal intervals, and the stirrups are The outer surface of the fixed sleeve of the rib is provided with a protective layer pad, and the top fixed sleeve of the vertical main rib is equipped with an EPE protective sleeve.

Through the above technical solution, the present invention provides a concrete structure with reinforced protective layer for viaduct piers, which at least has the following beneficial effects:

1. The viaduct pier steel protective layer concrete structure uses coarse aggregate with a more uniform particle size as aggregate without any fine aggregate, making the concrete more water-permeable and air-permeable, and combining coarse aggregate, modified cement, Steel fiber and reinforced resin are mixed with each other to improve the overall strength of the concrete, improve the carbonization resistance and chloride ion erosion resistance of the viaduct pier concrete layer, and extend the service life of the viaduct pier.

2. In the reinforced concrete structure of the viaduct pier protective layer, the acidic retarder on the surface of the modified cement hydrolyzes and releases H+ and acid ions after contact with water. H+ is used to destroy the interlayer structure of Li-Al LDHs, causing it to disintegrate and release Li+ and Al+. These two ions will penetrate and destroy the hydration film on the surface of cement particles, allowing water to continue to contact the cement particles and thereby promote cement hydration, which can effectively improve the early strength of viaduct piers during preparation.

3. In this viaduct pier steel protective layer concrete structure, the aggregate is carbonized and nano-silica is mixed with coarse aggregate so that the concrete layer of the viaduct pier can withstand greater pressure, thus improving the overall strength of the viaduct and making it The concrete layer remains stable over a long period of time.

4. In this viaduct pier reinforced concrete protective layer concrete structure, the sealing agent can be added when the concrete is mixed. The various raw materials work synergistically and continue to gradually play a role in the concrete hardening process. The pores on the concrete surface are closed, which can effectively reduce the contact between the concrete and the formwork. Defects at the interface can improve the aesthetics of the hardened concrete project and improve the rebound strength of the concrete.

5. In this viaduct pier reinforced concrete protective layer concrete structure, a hydrophobic agent is mixed into the concrete to make the internal channels of the concrete layer of the viaduct pier smoother and have strong water permeability, allowing rainwater to quickly penetrate into the ground, replenishing groundwater, and maintaining soil moisture. , maintains the ecological balance of groundwater and soil, and also has a sound-absorbing effect, which can reduce environmental noise. The gaps can absorb urban pollutants and reduce dust pollution.

6. In this viaduct pier steel protective layer concrete structure, the EPE protective casing can effectively prevent the top of the vertical main bars from being damaged during processing, ensuring that the tops of the vertical main bars are parallel and not bent, and the protective layer pads are vertically aligned with each other. Arrange one every meter, and eight of them are arranged symmetrically along the circumference. The protective layer pads that can withstand external forces have anchoring force to the steel cage. The anchoring force between the concrete layer and the steel cage is used to make the two closely integrated.

Description of the drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic diagram of the internal structure of the present invention;

Figure 3 is a partial enlarged view of position A in Figure 2 of the present invention.

In the picture: 1. Reinforcement cage; 101. Vertical main reinforcement; 102. Stirrups; 103. Protective layer pad; 104. EPE protective casing; 2. Concrete layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example 1:

A concrete structure with reinforced protective layer for viaduct piers, including a reinforced cage 1 with a concrete layer 2 poured on the outside of the reinforced cage 1;

Concrete layer 2 includes 100 parts of modified cement, 200 parts of coarse aggregate, 100 parts of steel fiber, 20 parts of reinforced resin, 10 parts of hydrophobic agent, 20 parts of water reducing agent, 10 parts of sealing agent, and 10 parts of antifreeze.

The preparation method of concrete layer 2 includes the following steps:

Step 1: Weigh each component according to the proportion. When feeding, first add modified cement, coarse aggregate, modified steel fiber, add 30% of the total water, and stir for 2 minutes at 1000 rpm;

Step 2: Add hydrophobic agent, stir at 1000 rpm for 2 minutes, add sealing agent, stir at 1000 rpm for 2 minutes;

Step 3: Then add water reducing agent and antifreeze, stir at 1000 rpm for 20 minutes, and discharge.

The preparation method of modified cement includes the following steps:

S1. Disperse Li-A l layered double metal hydroxide powder and acidic retarder in ethanol liquid to form a mixed suspension for later use;

S2. Collide the atomized mixed suspension with the cement particles carried by the hot carrier gas, so that the mixed suspension is sprayed onto the surface of the cement particles, and the ethanol on the surface of the cement particles is evaporated under the action of the hot carrier gas to obtain modification. For cement, the temperature of the hot carrier gas is 120°C, and the acidic retarder is one or a combination of boric acid, citric acid, and tartaric acid.

The preparation method of coarse aggregate includes the following steps:

S1. Soak the coarse aggregate in water and add nano-silica powder. The weight ratio of coarse aggregate to nano-silica powder is 5:1. Stir to fully mix the coarse aggregate and nano-silica powder to obtain Mix coarse aggregate;

S2. Place the mixed coarse aggregate in a carbonization furnace at 300°C and heat it for 2 hours to obtain carbonized mixed coarse aggregate;

S3. Take out the coarse aggregate for crushing.

The reinforced resin is one or a combination of sodium polyacrylate resin, melamine resin, and carboxymethyl cellulose grafted acrylic water-absorbent resin. The reinforced resin needs to be polymerized before being added to concrete. Polymerizing the reinforced resin can improve the strength. The resin's water retention and water absorption capabilities enable the concrete layer to maintain stable performance for a long time.

The water-reducing agent is one or a combination of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, aliphatic water-reducing agent, and sulfamate water-reducing agent. The water-reducing rate of the water-reducing agent is not less than 30%. .

Steel fiber is selected from one or more of ordinary steel fiber, stainless steel fiber and aluminum fiber. After adding steel fiber, the interface between steel fiber and concrete matrix is bonded, thereby improving the strength and crack resistance of the concrete layer. Steel fiber needs After annealing treatment, the internal grains of the steel fiber are refined and the grain boundaries are increased, resulting in a fine-grain strengthening effect and improving the tensile strength of the steel fiber.

The preparation method of the sealing agent includes the following steps: slurry 20 parts of silica powder, turn on the mixer, add 2 parts of long-chain carbonic acid, stir at 3000 rpm for 5 minutes, then add 6 parts of microcapsule sealing agent, 9 parts Chitosan was stirred at 1000 rpm for 20 minutes to obtain a sealing agent.

The steel cage 1 includes a plurality of vertical main bars 101. The plurality of vertical main bars 101 are distributed according to the shape of the outer contour of the viaduct pier. The outer surfaces of the plurality of vertical main bars 101 are bundled with stirrups 102 at equal intervals. The outer surfaces of the stirrups 102 are fixed. A protective layer cushion block 103 is provided, and an EPE protective sleeve 104 is fixedly provided at the top of the vertical main rib 101.

Example 2:

A concrete structure with reinforced protective layer for viaduct piers, including a reinforced cage 1 with a concrete layer 2 poured on the outside of the reinforced cage 1;

Concrete layer 2 includes 140 parts of modified cement, 250 parts of coarse aggregate, 150 parts of steel fiber, 40 parts of reinforced resin, 20 parts of hydrophobic agent, 40 parts of water reducing agent, 15 parts of sealing agent, and 15 parts of antifreeze.

The preparation method of concrete layer 2 includes the following steps:

Step 1: Weigh each component according to the proportion. When feeding, first add modified cement, coarse aggregate, modified steel fiber, add 40% of the total water, and stir for 3 minutes at 2000 rpm;

Step 2: Add hydrophobic agent, stir at 2000 rpm for 3 minutes, add sealing agent, stir at 2000 rpm for 3 minutes;

Step 3: Then add water reducing agent and antifreeze, stir at 2000 rpm for 25 minutes, and discharge.

The preparation method of modified cement includes the following steps:

S1. Disperse Li-A l layered double metal hydroxide powder and acidic retarder in ethanol liquid to form a mixed suspension for later use;

S2. Collide the atomized mixed suspension with the cement particles carried by the hot carrier gas, so that the mixed suspension is sprayed onto the surface of the cement particles, and the ethanol on the surface of the cement particles is evaporated under the action of the hot carrier gas to obtain modification. For cement, the temperature of the hot carrier gas is 160°C, and the acidic retarder is one or a combination of boric acid, citric acid, and tartaric acid.

The preparation method of coarse aggregate includes the following steps:

S1. Soak the coarse aggregate in water and add nano-silica powder. The weight ratio of coarse aggregate to nano-silica powder is 6:1. Stir to fully mix the coarse aggregate and nano-silica powder to obtain Mix coarse aggregate;

S2. Place the mixed coarse aggregate in a carbonization furnace at 400°C and heat for 2.5 hours to obtain carbonized mixed coarse aggregate;

S3. Take out the coarse aggregate for crushing.

The reinforced resin is one or a combination of sodium polyacrylate resin, melamine resin, and carboxymethyl cellulose grafted acrylic water-absorbent resin. The reinforced resin needs to be polymerized before being added to concrete. Polymerizing the reinforced resin can improve the strength. The resin's water retention and water absorption capabilities enable the concrete layer to maintain stable performance for a long time.

The water-reducing agent is one or a combination of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, aliphatic water-reducing agent, and sulfamate water-reducing agent. The water-reducing rate of the water-reducing agent is not less than 30%. .

Steel fiber is selected from one or more of ordinary steel fiber, stainless steel fiber and aluminum fiber. After adding steel fiber, the interface between steel fiber and concrete matrix is bonded, thereby improving the strength and crack resistance of the concrete layer. Steel fiber needs After annealing treatment, the internal grains of the steel fiber are refined and the grain boundaries are increased, resulting in a fine-grain strengthening effect and improving the tensile strength of the steel fiber.

The preparation method of the sealing agent includes the following steps: slurry 25 parts of silica powder, turn on the mixer, add 4 parts of long-chain carbonic acid, stir at 4000 rpm for 6 minutes, then add 7 parts of microcapsule sealing agent, 10 parts Chitosan was stirred at 1500 rpm for 30 minutes to obtain a sealing agent.

The steel cage 1 includes a plurality of vertical main bars 101. The plurality of vertical main bars 101 are distributed according to the shape of the outer contour of the viaduct pier. The outer surfaces of the plurality of vertical main bars 101 are bundled with stirrups 102 at equal intervals. The outer surfaces of the stirrups 102 are fixed. A protective layer cushion block 103 is provided, and an EPE protective sleeve 104 is fixedly provided at the top of the vertical main rib 101.

Embodiment three:

A concrete structure with reinforced protective layer for viaduct piers, including a reinforced cage 1 with a concrete layer 2 poured on the outside of the reinforced cage 1;

Concrete layer 2 includes 160 parts of modified cement, 300 parts of coarse aggregate, 200 parts of steel fiber, 60 parts of reinforced resin, 30 parts of hydrophobic agent, 60 parts of water reducing agent, 20 parts of sealing agent, and 20 parts of antifreeze.

The preparation method of concrete layer 2 includes the following steps:

Step 1: Weigh each component according to the proportion. When feeding, first add modified cement, coarse aggregate, modified steel fiber, add 50% of the total water, and stir at 3000 rpm for 4 minutes;

Step 2: Add hydrophobic agent, stir at 3000 rpm for 4 minutes, add sealing agent, stir at 3000 rpm for 4 minutes;

Step 3: Then add water reducing agent and antifreeze, stir at 3000 rpm for 30 minutes, and discharge.

The preparation method of modified cement includes the following steps:

S1. Disperse Li-A l layered double metal hydroxide powder and acidic retarder in ethanol liquid to form a mixed suspension for later use;

S2. Collide the atomized mixed suspension with the cement particles carried by the hot carrier gas, so that the mixed suspension is sprayed onto the surface of the cement particles, and the ethanol on the surface of the cement particles is evaporated under the action of the hot carrier gas to obtain modification. For cement, the temperature of the hot carrier gas is 200°C, and the acidic retarder is one or a combination of boric acid, citric acid, and tartaric acid.

The preparation method of coarse aggregate includes the following steps:

S1. Soak the coarse aggregate in water and add nano-silica powder. The weight ratio of coarse aggregate to nano-silica powder is 7:1. Stir to fully mix the coarse aggregate and nano-silica powder to obtain Mix coarse aggregate;

S2. Place the mixed coarse aggregate in a carbonization furnace at 500°C and heat for 3 hours to obtain carbonized mixed coarse aggregate;

S3. Take out the coarse aggregate for crushing.

The reinforced resin is one or a combination of sodium polyacrylate resin, melamine resin, and carboxymethyl cellulose grafted acrylic water-absorbent resin. The reinforced resin needs to be polymerized before being added to concrete. Polymerizing the reinforced resin can improve the strength. The resin's water retention and water absorption capabilities enable the concrete layer to maintain stable performance for a long time.

The water-reducing agent is one or a combination of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, aliphatic water-reducing agent, and sulfamate water-reducing agent. The water-reducing rate of the water-reducing agent is not less than 30%. .

Steel fiber is selected from one or more of ordinary steel fiber, stainless steel fiber and aluminum fiber. After adding steel fiber, the interface between steel fiber and concrete matrix is bonded, thereby improving the strength and crack resistance of the concrete layer. Steel fiber needs After annealing treatment, the internal grains of the steel fiber are refined and the grain boundaries are increased, resulting in a fine-grain strengthening effect and improving the tensile strength of the steel fiber.

The preparation method of the sealing agent includes the following steps: slurry 30 parts of silica powder, turn on the mixer, add 5 parts of long-chain carbonic acid, stir at 6000 rpm for 8 minutes, then add 8 parts of microcapsule sealing agent, 12 parts Chitosan was stirred at 2000 rpm for 40 minutes to obtain a sealing agent.

The steel cage 1 includes a plurality of vertical main bars 101. The plurality of vertical main bars 101 are distributed according to the shape of the outer contour of the viaduct pier. The outer surfaces of the plurality of vertical main bars 101 are bundled with stirrups 102 at equal intervals. The outer surfaces of the stirrups 102 are fixed. A protective layer cushion block 103 is provided, and an EPE protective sleeve 104 is fixedly provided at the top of the vertical main rib 101.

To sum up, the concrete structure of the viaduct pier reinforced protective layer adopts coarse aggregate with more uniform particle size without mixing any fine aggregate, which makes the water permeability and air permeability of the concrete better, and the coarse aggregate and modified aggregate are used. Stable cement, steel fiber and reinforced resin are mixed with each other to improve the overall strength of the concrete, improve the carbonation resistance and chloride ion erosion resistance of the viaduct pier concrete layer, and extend the service life of the viaduct pier.

The acidic retarder on the surface of the modified cement hydrolyzes and releases H+ and acid ions when it encounters water. H+ is used to destroy the interlayer structure of Li-AlLDHs, causing it to disintegrate and release Li+ and Al 3+. These two ions will penetrate , destroy the hydration film on the surface of cement particles, allowing water to continue to contact the cement particles to promote cement hydration, which can effectively improve the early strength of viaduct piers during preparation.

The aggregate is carbonized and nano-silica is mixed with coarse aggregate so that the concrete layer 2 of the viaduct pier can withstand greater pressure, thereby improving the overall strength of the viaduct and keeping the concrete layer 2 stable for a long time.

The sealing agent can be added when the concrete is mixed. The various raw materials work synergistically to gradually play a role in the concrete hardening process. Sealing the pores on the concrete surface can effectively reduce defects at the interface between concrete and formwork, and can improve the hardened concrete project. Improve the aesthetics and improve the rebound strength of concrete.

The hydrophobic agent is mixed into the concrete to make the internal channels of the concrete layer 2 of the viaduct pier smoother and have strong water permeability, allowing rainwater to quickly penetrate into the ground, replenishing groundwater, maintaining soil moisture, and maintaining the ecological balance of groundwater and soil, and It also has a sound-absorbing effect, which can reduce environmental noise. The gaps can absorb urban pollutants and reduce dust pollution.

The EPE protective sleeve 104 can effectively prevent the top of the vertical main bars 101 from being damaged during processing, ensuring that the tops of the vertical main bars 101 are parallel and not bent. The protective layer pads 103 are arranged vertically every 2 meters. Eight protective layer pads 103 are arranged symmetrically along the circumference of the road, and the protective layer pads 103, which bear the action of external forces, have anchoring force on the steel cage 1. The anchoring force between the concrete layer 2 and the steel cage 1 is used to make the two closely combined.

It should be noted that the terms "comprises," "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements not only includes those elements, but also includes none. Other elements expressly listed, or elements inherent to such process, method, article or equipment.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. A concrete structure with reinforced protective layer for viaduct piers, including a reinforced cage (1), characterized in that: a concrete layer (2) is poured on the outside of the reinforced cage (1); The concrete layer (2) includes 100-160 parts of modified cement, 200-300 parts of coarse aggregate, 100-200 parts of steel fiber, 20-60 parts of reinforcing resin, 10-30 parts of hydrophobic agent, and 20 parts of water-reducing agent. ~60 parts, 10-20 parts sealing agent, 10-20 parts antifreeze. 2. The viaduct pier reinforced protective layer concrete structure according to claim 1, characterized in that: the preparation method of the concrete layer (2) includes the following steps: Step 1: Weigh each component according to the proportion. When feeding, first add modified cement, coarse aggregate, modified steel fiber, add 30 to 50% of the total water, and stir for 2 to 4 seconds at 1000 to 3000 rpm. minute; Step 2: Add hydrophobic agent and stir at 1000-3000 rpm for 2-4 minutes. Add sealing agent and stir at 1000-3000 rpm for 2-4 minutes; Step 3: Then add water-reducing agent and antifreeze, stir at 1000-3000 rpm for 20-30 minutes, and discharge. 3. The viaduct pier reinforced protective layer concrete structure according to claim 1, characterized in that: the preparation method of the modified cement includes the following steps: S1. Disperse Li-Al layered double metal hydroxide powder and acidic retarder in ethanol liquid to form a mixed suspension for later use; S2. Collide the atomized mixed suspension with the cement particles carried by the hot carrier gas, so that the mixed suspension is sprayed onto the surface of the cement particles, and the ethanol on the surface of the cement particles is evaporated under the action of the hot carrier gas to obtain the above Modified cement. 4. The viaduct pier steel bar protective layer concrete structure according to claim 3, characterized in that: the temperature of the hot carrier gas is between 120 and 200°C, and the acidic retarder is one of boric acid, citric acid, and tartaric acid. A combination of species or species. 5. The viaduct pier reinforced protective layer concrete structure according to claim 1, characterized in that: the preparation method of the coarse aggregate includes the following steps: S1. Soak the coarse aggregate in water and add nano-silica powder. The weight ratio of coarse aggregate to nano-silica powder is (5~7):1. Stir the coarse aggregate and nano-silica powder. Mix thoroughly to obtain mixed coarse aggregate; S2. Place the mixed coarse aggregate in a carbonization furnace at 300-500°C and heat it for 2-3 hours to obtain carbonized mixed coarse aggregate; S3. Take out the coarse aggregate for crushing. 6. The viaduct pier steel bar protective layer concrete structure according to claim 1, characterized in that: the reinforced resin is one or more of sodium polyacrylate resin, melamine resin, and carboxymethyl cellulose grafted acrylic water-absorbing resin. combination of species. 7. The viaduct pier steel bar protective layer concrete structure according to claim 1, characterized in that: the water-reducing agent is polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, aliphatic water-reducing agent, sulfamate water-reducing agent. One or more combinations of water-reducing agents, the water-reducing rate of the water-reducing agent is not less than 30%. 8. The viaduct pier reinforced protective layer concrete structure according to claim 1, characterized in that the steel fiber is selected from one or more of ordinary steel fiber, stainless steel fiber and aluminum fiber. 9. The viaduct pier steel bar protective layer concrete structure according to claim 1, characterized in that: the preparation method of the sealing agent includes the following steps: slurry 20 to 30 parts of silica powder, turn on the mixer, and add 2 to 5 parts of long-chain carbonic acid, stir at 3000-6000 rpm for 5-8 minutes, then add 6-8 parts of microcapsule sealing agent, 9-12 parts of chitosan, stir at 1000-2000 rpm for 20-40 minutes to obtain the sealing agent. 10. The viaduct pier reinforced concrete protective layer concrete structure according to claim 1, characterized in that: the steel cage (1) includes a plurality of vertical main bars (101), and the plurality of vertical main bars (101) are constructed according to the requirements of the viaduct. Shape distribution of the outer contour of the pier, the outer surfaces of the plurality of vertical main bars (101) are bundled with stirrups (102) at equal intervals, and the outer surfaces of the stirrups (102) are fixed with protective layer pads (103) ), the top end of the vertical main rib (101) is fixed with an EPE protective sleeve (104).