Reinforcing system of reinforced concrete structural beam and construction method

Abstract

The invention provides a reinforcing system of a reinforced concrete structural beam and a construction method, the reinforcing system comprises a beam body, a carbon fiber assembly, a steel pressing assembly and an anchor column assembly, the carbon fiber assembly is located between the beam body and the steel pressing assembly; the beam body is sleeved with the steel pressing assembly, and the steel pressing assembly is connected with a structural column located at the long end of the beam body through an anchor column assembly. The carbon fiber assembly comprises beam bottom carbon fibers, U-shaped carbon fibers and carbon fiber pressing strips, and the beam bottom carbon fibers are located on the inner sides of the U-shaped carbon fibers and connected with the bottom face of the beam body; the two ends of the U-shaped carbon fibers are connected with the wide ends of the beam body respectively, and the tops of the U-shaped carbon fibers are fixed to the beam body through the carbon fiber pressing strips. The structural strength of the whole reinforcing system is comprehensively improved through the excellent mechanical property of the carbon fiber assembly and the rigidity of the steel pressing assembly, the carbon fiber assembly is light and thin in texture, the construction method is simple, the manufacturing cost is low, and the occupied indoor space, the construction difficulty and the construction cost can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a reinforcement system and construction method for a reinforced concrete structural beam. Background Art

[0002] In the renovation construction of old houses, the reinforcement of the main structure is an extremely important construction link. Traditional reinforcement methods include: increasing the number of structural columns or beams, increasing the cross-sectional size of structural members, increasing the reinforcement, etc. Such reinforcement methods will occupy indoor space and have a greater impact on the space utilization rate of the structure. Moreover, the construction process is cumbersome, the construction period is long, and the cost is high. Therefore, there is an urgent need for a reinforcement construction plan with small space occupation, simple process, and low cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a reinforcement system and construction method for a reinforced concrete structural beam to solve the deficiencies in the above background art.

[0004] The technical solution of the present invention is: a reinforcement system for a reinforced concrete structural beam, which includes: a beam body, a carbon fiber component, a steel pressing component, and an anchor column component. The carbon fiber component is located between the beam body and the steel pressing component; the steel pressing component is sleeved outside the beam body and is connected to the structural column at the long end of the beam body through the anchor column component.

[0005] Preferably, the carbon fiber component includes a bottom carbon fiber of the beam, a U-shaped carbon fiber, and a carbon fiber pressing strip. The bottom carbon fiber of the beam is located inside the U-shaped carbon fiber and is connected to the bottom surface of the beam body; both ends of the U-shaped carbon fiber are respectively connected to the wide ends of the beam body, and the top is fixed to the beam body by the carbon fiber pressing strip.

[0006] Preferably, the steel pressing component includes a top pressing plate of the beam and a U-shaped steel hoop. The top pressing plate of the beam and the U-shaped steel hoop are respectively located at the top and bottom ends of the beam body and are connected by a tie rod passing through the beam body.

[0007] Preferably, a plurality of the top pressing plates of the beam and the U-shaped steel hoops are respectively distributed along the length direction of the beam body, wherein: the distribution density of the top pressing plates of the beam in the middle of the beam body > the distribution density of the top pressing plates of the beam at the end of the beam body.

[0008] Preferably, the tie rod includes a chemical anchor bolt and a limit nut. The limit nut abuts against the top surface of the beam body. The top end of the chemical anchor bolt is screwed to the limit nut, and the bottom end passes through the beam body and then connects to the outer wall of the U-shaped steel hoop.

[0009] Preferably, corner angle steels are arranged between the carbon fiber components and the U-shaped steel hoops. There are two groups of corner angle steels arranged in the width direction of the beam body. The concave sides of the two groups of corner angle steels face each other. The vertical ends of the corner angle steels are connected to the side walls of the beam body, and the horizontal ends of the corner angle steels are connected to the bottom surface of the beam body.

[0010] Preferably, a backing plate is arranged between the carbon fiber batten and the U-shaped steel hoop, and the thickness of the backing plate is the same as that of the corner angle steel.

[0011] Preferably, the total length by which the beam top pressing plate extends beyond the wide ends of the beam body is ≥100 mm, and the tie bolts are located at the positions where the beam top pressing plate extends beyond the wide ends of the beam body.

[0012] Preferably, a wire mesh is arranged on the outer wall of the steel pressing assembly, and a mortar protective layer is arranged on the wire mesh.

[0013] Preferably, the anchor column assembly includes transverse bolts, and the two ends of the transverse bolts are respectively connected to the structural column and the U-shaped steel hoop.

[0014] The technical solution of the present invention further includes: a construction method for the reinforcement system of the above-mentioned reinforced concrete structural beam, which includes the steps:

[0015] Perform surface treatment on the beam body to remove the loose concrete residues and sharp corners on its surface;

[0016] Apply the base glue and paste the carbon fiber components on the bottom and side surfaces of the beam body in sequence;

[0017] Install the steel pressing assembly, pass the tie bolts through the beam body, install and fix the steel pressing assembly in sequence, and connect the U-shaped steel hoop and the beam top pressing plate through the tie bolts

[0018] Apply plaster for protection, brush anti-rust paint on the steel pressing assembly, paste the wire mesh, and construct a mortar protective layer on the wire mesh using cement mortar.

[0019] The beneficial effects of the present invention are as follows: This technical solution provides a new construction idea for the reinforcement of the beam structure of old houses. By the excellent mechanical properties of the carbon fiber components and the stiffness of the steel pressing components, the structural strength of the entire reinforcement system is comprehensively improved, enhancing the reinforcement effect on the beam body. Moreover, the carbon fiber components are light in texture, simple in construction method, and low in cost, which can effectively reduce the occupation of indoor space, construction difficulty, and construction cost. Description of the Drawings

[0020] Figure 1 is the side view of the embodiment of the present invention;

[0021] Figure 2 is the attachment of the embodiment of the present invention Figure 1Cross-sectional view in the direction of aa';

[0022] Figure 3 This is an appendix to an embodiment of the present invention Figure 2 Enlarged view of the structure at location A in the figure;

[0023] Figure 4 This is an appendix to an embodiment of the present invention Figure 2 Enlarged view of the structure at location B in the figure.

[0024] In the figure:

[0025] 1. Beam body;

[0026] 2. Carbon fiber component; 21. Carbon fiber at the bottom of the beam; 22. U-shaped carbon fiber; 23. Carbon fiber pressing strip;

[0027] 3. Steel pressing component; 31. Pressing plate at the top of the beam; 32. U-shaped steel hoop; 33. Corner angle steel; 34. Tie bolt; 341. Chemical anchor bolt; 342. Limit nut; 35. Base plate; 36. U-shaped hoop;

[0028] 4. Transverse bolt;

[0029] 5. Lead wire mesh;

[0030] 6. Mortar protective layer;

[0031] 7. Structural column. Detailed implementation manners

[0032] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation to the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "set", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0034] Refer to the appendix Figures 1-4, an embodiment of the present invention provides a reinforcement system for a reinforced concrete structure beam, which includes: a beam body 1, a carbon fiber assembly 2, a steel pressing assembly 3, and an anchor column assembly. The carbon fiber assembly 2 is located between the beam body 1 and the steel pressing assembly 3, adheres to the side wall and the bottom surface of the beam body 1 to form an integral body therewith, and through its extremely high tensile strength, lifts the bearing capacity of the beam body 1. At the same time, when the beam body 1 is subjected to an external force, the carbon fiber assembly 2 works together with the original reinforced concrete of the beam body 1 to bear part of the load, thereby improving the bending and shear resistance of the beam body 1. Moreover, after the carbon fiber assembly 2 adheres to the beam body 1, it can effectively seal the cracks on the surface of the beam body 1, prevent the further expansion of the cracks, and improve the crack resistance of the beam body 1 by virtue of its high elastic modulus; the steel pressing assembly 3 is sleeved outside the beam body 1 and is connected to the structural column 7 at the long end of the beam body 1 through the anchor column assembly. The steel pressing assembly 3 is used to further enhance the structural strength of the present reinforcement system and to further improve the connection tightness between the carbon fiber assembly 2 and the beam body 1.

[0035] The above technical solution provides a new construction idea for the reinforcement of the beam structure of old houses. By the excellent mechanical properties of the carbon fiber assembly 2 and the stiffness of the steel pressing assembly 3, the structural strength of the entire reinforcement system is comprehensively improved, the reinforcement effect on the beam body 1 is enhanced, and the carbon fiber assembly 2 is light in texture, simple in construction method, and low in cost, which can effectively reduce the occupation of indoor space, construction difficulty, and construction cost.

[0036] Refer to the appendix Figure 2 , the carbon fiber assembly 2 includes a bottom carbon fiber 21 of the beam, a U-shaped carbon fiber 22, and a carbon fiber pressing strip 23. The bottom carbon fiber 21 of the beam is located inside the U-shaped carbon fiber 22 and directly adheres to the bottom surface of the beam body 1; the U-shaped carbon fiber 22 covers the bottom carbon fiber 21 of the beam and the outside of the beam body 1. The two ends of the U-shaped carbon fiber 22 are directly adhered to the wide ends of the beam body 1 respectively, and the top of the U-shaped carbon fiber 22 is fixed to the beam body 1 by the carbon fiber pressing strip 23, and the carbon fiber pressing strip 23 is directly adhered to the wide ends of the beam body 1.

[0037] The steel pressing assembly 3 includes a top pressing plate 31 of the beam, a U-shaped steel hoop 32, and a corner wrapping angle steel 33. The top pressing plate 31 of the beam and the U-shaped steel hoop 32 are respectively located at the top and bottom ends of the beam body 1 and are connected by a tie rod 34 passing through the beam body 1; the corner wrapping angle steel 33 is located inside the U-shaped steel hoop 32 and is directly connected to the carbon fiber assembly 2.

[0038] Among them, there are two groups of corner wrapping angle steels 33 arranged in the width direction of the beam body 1. The concave directions of the two groups of corner wrapping angle steels 33 are opposite. The vertical ends of the corner wrapping angle steels 33 are connected to the side wall of the beam body 1 (indirect connection, there is also a carbon fiber assembly 2 between the corner wrapping angle steels 33 and the side wall of the beam body 1), and the horizontal ends of the corner wrapping angle steels 33 are connected to the bottom surface of the beam body 1.

[0039] In order to ensure the effective connection between the U-shaped steel plate hoop 32 and the carbon fiber component 2, a backing plate 35 is configured between the carbon fiber batten 23 and the U-shaped steel plate hoop 32 in this embodiment, and the thickness of the backing plate 35 is the same as that of the corner-encasing angle steel 33.

[0040] If the beam body to be strengthened includes a main beam and a secondary beam that intersect with each other, since it is not convenient to configure the U-shaped steel plate hoop 32 at the intersection of the two, a U-shaped hoop 36 can be configured at the intersection of the two. Similar to the U-shaped steel plate hoop 32, the U-shaped hoop 36 is also arranged with its opening facing the beam body. Different from the U-shaped steel plate hoop 32, the whole body of the U-shaped hoop 36 is rod-shaped, while the whole body of the U-shaped steel plate hoop 32 is plate-shaped. At the intersection of the main beam and the secondary beam, holes can be pre-drilled, and then the two vertical ends of the U-shaped hoop 36 can be installed in the pre-drilled holes by means of chemical anchoring.

[0041] In this embodiment, the anchor column assembly includes a transverse anchor rod 4, and both ends of the transverse anchor rod 4 are respectively connected to the structural column 7 and the U-shaped steel plate hoop 32 to improve the installation stability of the pressing plate assembly.

[0042] In addition, on the basis of ensuring the strengthening effect on the beam body 1, this embodiment also optimizes the configuration of the pressing plate assembly, specifically as follows: There are several beam top pressing plates 31 and U-shaped steel plate hoops 32 in the pressing plate assembly that are respectively distributed along the length direction of the beam body 1, and the positions of each group of beam top pressing plates 31 and U-shaped steel plate hoops 32 correspond to each other, so as to facilitate connection and fixation through the tie rod 34. By using the spaced-apart and short beam top pressing plates 31 (or U-shaped steel plate hoops 32) to replace the full-length beam top pressing plates 31 (or U-shaped steel plate hoops 32), the load on the beam body 1 from the pressing plate assembly can be reduced, and the service life of the structure can be improved; More preferably: The distribution density of the beam top pressing plates 31 in the middle of the beam body 1 > the distribution density of the beam top pressing plates 31 at the ends of the beam body 1. This is because the structural column 7 is connected to the end of the beam body 1, and part of the load it receives can be transmitted and dispersed through the structural column 7, while the load received by the middle of the beam body 1 is difficult to be transmitted and dispersed in the above way. Therefore, the risk of deformation and cracking in the middle of the beam body 1 is greater. Therefore, the beam top pressing plates 31 and the corresponding U-shaped steel plate hoops 32 need to have a greater distribution density in the middle of the beam body 1.

[0043] In this embodiment, the tie rod 34 includes a chemical anchor bolt 341 and a limit nut 342. The limit nut 342 abuts against the top surface of the beam top pressing plate 31. The top end of the chemical anchor bolt 341 is screwed with the limit nut 342, and the bottom end penetrates through the beam body 1 and then connects to the outer wall of the U-shaped steel plate hoop 32.

[0044] It should be noted that the total length of the beam top pressing plate 31 exceeding the wide end of the beam body 1 should be greater than or equal to 100 mm. The tie rod 34 is located at the position where the beam top pressing plate 31 exceeds the wide end of the beam body 1, and when drilling holes in the structural slab above the beam body 1 to pass through the tie rod 34, the steel bars of the beam body 1 itself should be avoided.

[0045] In addition, a wire mesh 5 is disposed on the outer wall of the steel pressing component 3, and a mortar protective layer 6 is disposed on the wire mesh 5. The wire mesh 5 is used to improve the bonding force between the steel pressing component 3 and the mortar protective layer 6, and the mortar protective layer 6 is used to protect the steel pressing component 3 and the carbon fiber component 2, thereby improving the service life of the structure.

[0046] The following is the construction method of the reinforcement system provided in this embodiment.

[0047] Step 1: Surface treatment of the beam body 1

[0048] The outer surface of the beam body 1 is polished flat with a handheld electric grinding wheel, and the two corners at the bottom of the beam are polished into small rounded corners with a radius R = 20 mm. The loose concrete residues, sharp corners, etc. on the outer surface of the beam body 1 are removed.

[0049] Step 2: Apply the base glue

[0050] The ambient temperature in this step should be controlled not to be lower than 5°C, and the humidity should be controlled not to be higher than 85%. The concrete on the surface of the beam body 1 is in a dry state, and its water content is lower than 10%.

[0051] The base glue is stirred by a low-speed machine, and the stirring time should not be too long. The specific stirring time depends on the variety of the base glue used and is not specifically limited here.

[0052] When applying, a roller brush is used to evenly coat the beam body 1. The coating amount depends on the variety of the base glue and the concrete state on the surface of the beam body 1 and is not specifically limited here.

[0053] Step 3: Paste the carbon fiber component 2

[0054] Paste a layer of bottom carbon fiber 21 of the beam at the bottom of the beam body 1. The width of the bottom carbon fiber 21 of the beam is the same as the width of the beam body 1;

[0055] According to the full-bonding specification, paste the U-shaped carbon fiber 22 on the side surface of the beam body 1 and the bottom of the bottom carbon fiber 21 of the beam;

[0056] Paste the carbon fiber strip 23 on the outside of the U-shaped carbon fiber 22 and close to the top of the U-shaped carbon fiber 22. The width of the carbon fiber strip 23 is preferably 100 mm.

[0057] In this step: when pasting the carbon fiber cloth, the force direction must be determined, and the pasting direction of the carbon fiber cloth should be consistent with the force direction. For example, when the bottom of the beam needs to be reinforced due to bending, the pasting direction of the carbon fiber cloth should be parallel to the axial direction of the beam. When the beam needs to be reinforced due to lateral shear, the pasting direction of the carbon fiber cloth should be perpendicular to the axial direction of the beam. The carbon fiber cloth needs to be laid flat and cannot be wrinkled or bent. The impregnating glue (primer glue) must be rolled and soaked with a special rolling wheel, and bubbles must be removed. The cutting size must include the longitudinal and transverse overlapping parts. The cut carbon fiber cloth cannot be folded and must be rolled on a roller with a radius R ≥ 80mm before pasting. If the cut carbon fiber cloth is not used up on the same day, it should be placed in a dust-free, dry place without direct sunlight and sealed for storage. The carbon fiber cloth must be pasted along the positioning line, and multiple layers should be pasted layer by layer. The next layer must be pasted after the previous layer is cured. Multiple layers of carbon fiber cloth must not be pasted at one time.

[0058] Step 4: Install the steel pressing assembly 3

[0059] (1) Processing the adhesive surface of the pressed steel component 3

[0060] If the pasting surface of the pressed steel component 3 is not rusted or slightly rusted, it is polished by sandblasting, emery cloth or flat grinding wheel until the pasting surface of the pressed steel component 3 has a metallic luster.

[0061] The higher the roughness of the grinding, the better, and the grinding lines should be perpendicular to the force direction of the pressed steel component 3.

[0062] After polishing, use absorbent cotton dipped in acetone to wipe clean the adhesive surface of the pressed steel component 3.

[0063] If the adhesive surface of the pressed steel component 3 is severely rusted, it must be soaked in moderate hydrochloric acid to remove the rust layer, then rinsed with lime water to neutralize the acidic substances, and finally polished with a flat grinding wheel to create the texture.

[0064] (2) Drilling the mounting hole for the tie anchor 34

[0065] Find out the position of the longitudinal reinforcement in the beam body 1, and use an electric drill to drill holes in the beam top pressure plate 31 and the structural plate above the beam body 1. Be careful to avoid the longitudinal reinforcement in the beam body 1 when drilling.

[0066] After drilling, the ash in the hole is removed and the chemical anchor bolt 341 is embedded in the beam body 1.

[0067] (3) Install the pressed steel assembly 3

[0068] The U-shaped steel plate hoop 32 is placed on the outside of the corner steel 33 and the backing plate 35 and the inside of the chemical anchor rod, and the U-shaped steel plate hoop 32 is welded to the above structure along the entire length, with a weld height of 8 mm.

[0069] Install the beam top pressing plate 31 on the top of the chemical anchor bolt, tighten the limit nut 342, and restrict the beam top pressing plate 31 between the limit nut 342 and the beam top; weld the U-shaped steel hoop 32 at the end of the beam body 1 to the transverse anchor bolt 4 embedded in the structural column 7.

[0070] Prepare the steel bonding adhesive well, inject the steel bonding adhesive between the corner-encasing angle steel 33 and the carbon fiber assembly 2, and inject it between the backing plate 35 and the carbon fiber assembly 2 for bonding.

[0071] Among them, the corner-encasing angle steel 33 corresponds to the length of the beam body 1. Along the length direction of the beam body 1, at the middle 1 / 3 of its length, a beam top pressing plate 31 with a width of 150 mm and a thickness of 10 mm is arranged at an interval of 300 mm, and the corresponding U-shaped steel hoop 32 is arranged. At the two ends 1 / 3 of its length, a beam top pressing plate 31 with a width of 150 mm and a thickness of 10 is arranged at an interval of 600 mm.

[0072] Step Five: Plastering for protection

[0073] After the steel pressing assembly 3 is installed stably, remove the external reinforcement fixtures, etc. Paint the anti-rust paint on the outer surface of the steel pressing assembly 3, paste the lead wire mesh 5, and plaster with 1:3 cement mortar to obtain the mortar protection layer 6.

[0074] Compared with the prior art, the present invention provides a new construction idea for the reinforcement of the beam structure of old houses. The structural strength of the entire reinforcement system is comprehensively improved through the excellent mechanical properties of the carbon fiber assembly 2 and the stiffness of the steel pressing assembly 3, enhancing the reinforcement effect on the beam body 1. Moreover, the carbon fiber assembly 2 is light in texture, simple in construction method, and low in cost, which can effectively reduce the occupation of indoor space, construction difficulty, and construction cost.

[0075] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A reinforcement system for a reinforced concrete structural beam, characterized in that, Including: A beam body, a carbon fiber component, a pressed steel component, and an anchor column component. The carbon fiber component is located between the beam body and the pressed steel component; the pressed steel component is sleeved outside the beam body and is connected to a structural column at the long end of the beam body through the anchor column component.

2. The reinforcement system for a reinforced concrete structural beam according to claim 1, characterized in that, The carbon fiber component includes a bottom carbon fiber of the beam, a U-shaped carbon fiber, and a carbon fiber pressing strip. The bottom carbon fiber of the beam is located inside the U-shaped carbon fiber and is connected to the bottom surface of the beam body; both ends of the U-shaped carbon fiber are respectively connected to the wide ends of the beam body, and the top is fixed to the beam body by the carbon fiber pressing strip.

3. The reinforcement system for a reinforced concrete structural beam according to claim 2, characterized in that, The pressed steel component includes a top pressing plate of the beam and a U-shaped steel plate hoop. The top pressing plate of the beam and the U-shaped steel plate hoop are respectively located at the top and bottom ends of the beam body and are connected by a tie rod passing through the beam body.

4. The reinforcement system for a reinforced concrete structural beam according to claim 3, characterized in that, A plurality of the top pressing plates of the beam and the U-shaped steel plate hoops are respectively distributed along the length direction of the beam body. Among them: the distribution density of the top pressing plates of the beam in the middle of the beam body > the distribution density of the top pressing plates of the beam at the ends of the beam body.

5. The reinforcement system for a reinforced concrete structural beam according to claim 3, characterized in that, The tie rod includes a chemical anchor bolt and a limit nut. The limit nut abuts against the top surface of the beam body. The top end of the chemical anchor bolt is screwed to the limit nut, and the bottom end passes through the beam body and then is connected to the outer wall of the U-shaped steel plate hoop.

6. The reinforcement system for a reinforced concrete structural beam according to any one of claims 3-5, characterized in that, A corner-encasing angle steel is configured between the carbon fiber component and the U-shaped steel plate hoop. Two groups of the corner-encasing angle steels are configured in the width direction of the beam body. The concave directions of the two groups of the corner-encasing angle steels are opposite to each other. The vertical ends of the corner-encasing angle steel are connected to the side wall of the beam body, and the horizontal ends of the corner-encasing angle steel are connected to the bottom surface of the beam body.

7. The reinforcement system for a reinforced concrete structural beam according to claim 6, characterized in that, A backing plate is configured between the carbon fiber pressing strip and the U-shaped steel plate hoop. The thickness of the backing plate is the same as that of the corner-encasing angle steel.

8. The reinforcement system for a reinforced concrete structural beam according to any one of claims 3-5 and 7, characterized in that, The total length of the top pressing plate of the beam exceeding the wide end of the beam body ≥ 100 mm, and the tie rod is located at the position where the top pressing plate of the beam exceeds the wide end of the beam body.

9. The reinforcement system for a reinforced concrete structural beam according to claim 8, characterized in that, A wire mesh is configured on the outer wall of the pressed steel component, and a mortar protective layer is configured on the wire mesh; The anchor column component includes a transverse anchor rod, and both ends of the transverse anchor rod are respectively connected to the structural column and the U-shaped steel plate hoop.

10. The construction method of the reinforcement system for the reinforced concrete structure beam according to claim 9, characterized in that, Including steps: Perform surface treatment on the beam body to remove loose concrete residues and sharp corners on its surface; Apply a primer and paste the carbon fiber component on the bottom and side surfaces of the beam body in sequence; Install the pressed steel component, pass the tie rod through the beam body, install and fix the pressed steel component in sequence, and connect the U-shaped steel plate hoop and the top pressing plate of the beam through the tie rod Perform plastering protection, brush an anti-rust paint on the pressed steel component, paste a wire mesh, and construct a mortar protective layer on the wire mesh with cement mortar.

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