Novel method for coating sealant on surface of main steel structural member of bridge

Abstract

The invention discloses a novel bridge main steel structure component surface sealant coating method, and belongs to the technical field of bridge steel structure surface protection.The method comprises the steps that a prefabricated sealant piece is adopted and cut into the size of a bridge main steel structure component, and the prefabricated sealant piece is formed; and a layer of thin sealant is coated on the surface of the cleaned steel structural member in a blade coating mode, then a prefabricated rubber sheet is pasted on the sealant bonding coating, and surface protection of the steel structural member is completed. By means of the method, the thickness of the protective layer can be uniform, the appearance quality is improved, the coating effect is consistent and controllable, and meanwhile the sealing coating efficiency of the steel structural component can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of surface protection of bridge steel structures, and particularly to a method for coating a sealing glue on the surfaces of main steel structure components of a new type of bridge. Background Art

[0002] For the construction of cable-stayed bridges or suspension bridges, it is necessary to protect the main steel structure components of the bridges, such as anti-corrosion, fire protection and moisture-proof treatments. Currently, coating with sealing glue is the main treatment method. The coating construction method usually adopts manual scraping or machine scraping. Manual scraping often causes air bubbles, pits and scratches in the scraped sealing glue coating due to improper operation, seriously affecting the appearance and protection quality. When using machine scraping, such as an automatic glue mixing and scraping device, although the scraping quality can be controlled, the scraping speed is slow, and the machine maintenance takes a long time, resulting in an extended construction period. The glue scraping device usually has a glue conveying pipeline. When carrying out scraping operations, the glue conveying pipeline needs to be filled. After the glue conveying is completed, the residual sealing glue in the pipeline is wasted. And after it is placed and dried, the sealing glue dries and solidifies, and the entire pipeline system needs to be replaced for reuse. Moreover, for the surfaces of some special-shaped structures and the protective structures required at the construction site (such as the bridge site under construction or the structure to be maintained at high altitude, etc.), the machine cannot be adapted for scraping. In addition, since the bridge steel structure components need to be fully coated with sealing glue and involve multi-surface coating, whether it is manual scraping or machine scraping, when scraping, it is necessary to wait until the surface of the sealing glue to be scraped is surface-dried and does not flow before flipping to scrape the next surface, and so on until all surfaces are completely scraped. The surface drying time of the sealing glue is relatively long, and it is difficult to improve the scraping efficiency. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a method for coating a sealing glue on the surfaces of main steel structure components of a new type of bridge. By using a prefabricated sealing glue film, it is matched with the pre-coated surface of the steel structure component and adhered to the sealing glue bonding coating in the form of a film to form a protective layer. On the one hand, it can ensure the uniform thickness of the overall protective layer, improve and control the appearance quality. On the other hand, it can greatly improve the construction speed and at the same time meet the sealing coating requirements for the surfaces of special-shaped components and different working conditions.

[0004] The technical solution of the present invention is as follows:

[0005] A method for coating a sealing glue on the surfaces of main steel structure components of a new type of bridge, comprising the following steps:

[0006] Step S1, obtaining data of each surface of the pre-coated steel structure component;

[0007] Step S2, manufacturing a matching sealing glue film according to the component surface data;

[0008] Step S3: Apply a layer of sealant on the surface of the cleaned steel structure member to form an adhesive coating.

[0009] Step S4: Stick the sealant film on the adhesive coating on the surface of the matching steel structure member to complete the coating of the steel structure member.

[0010] As a further improvement of the present invention, the sealant film is formed by laying and shaping the sealant colloid according to a set thickness and curing it at room temperature.

[0011] As a further improvement of the present invention, the type of the sealant colloid is a vulcanized sealant.

[0012] As a further improvement of the present invention, the sealant used for the adhesive coating and the sealant film are made of the same type of material.

[0013] As a further improvement of the present invention, the thickness of the sealant film is 3 - 6 mm.

[0014] As a further improvement of the present invention, the thickness of the adhesive coating is 0.5 - 2 mm.

[0015] As a further improvement of the present invention, the sag of the sealant colloid ≤ 1 mm.

[0016] As a further improvement of the present invention, the forming time of the sealant film at room temperature ≥ 4 hours.

[0017] As a further improvement of the present invention, the thickness error of the sealant film is ±0.5 mm.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] The sealant coating method of the present invention makes the sealant colloid into a dry sealant film with a certain thickness, cuts it according to the shapes of each surface of the steel structure member, and then pastes it on the steel structure member through the sealant colloid coated on the steel structure to complete the protection treatment. By using the patch method to coat the sealant, the present invention can well solve the problems of uneven thickness, uneven appearance quality, and difficult-to-control coating effect caused by manual coating, and can also solve the problems of slow construction speed and waste of raw materials in mechanical equipment coating, and can greatly shorten the steel structure sealing construction time. In addition, the sealant film made by the present invention can be applied to the coating of irregular surfaces and is also convenient for construction operations under special working conditions (such as high-altitude operations, bridge site sites, etc.), and can meet the protection requirements of different working conditions of the parts that need to be protected on the bridge steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0021] Figure 1 is a flowchart of the coating method of the present invention;

[0022] Figure 2 is a physical diagram of the sealant film;

[0023] Figure 3 is a schematic cross-sectional view of the bolt after coating. In the figure, 1 - bolt, 2 - adhesive coating, 3 - sealant film; a - upper surface, b - lower surface, c - left upper wing along the plate surface, d - left side of the web, e - left lower wing along the plate surface, f - right upper wing along the plate surface, g - right side of the web, h - right lower wing along the plate surface;

[0024] Figure 4 is a schematic diagram of the bolt group to be coated on the bridge in the embodiment. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0026]

Embodiment 1

[0027] As Figure 1 shown, the present invention proposes a new method for coating sealant on the surface of the main steel structure components of a bridge, which specifically includes the following steps:

[0028] Step S1, obtain data of each surface of the steel structure component to be pre-coated. On a bridge, the main steel structure components that need to be coated with sealant include, but are not limited to, bridge main cables, cable clamps, air clamps, suspension cables, sling bolts, fork-shaped lugs, stay cables, stay cable bolts, etc. In this embodiment, the protection of bolts in the steel structure of a suspension bridge is taken as an example for introduction.

[0029] Step S2, adapt the sealant film according to the surface size of the component. For Figure 3 the bolt in

[0030] (the enlarged view in the figure), its shape is an H-shaped steel, which is divided into an upper surface a, a lower surface b, a left upper wing along the plate surface c, a left side of the web d, a left lower wing along the plate surface e, a right upper wing along the plate surface f, a right side of the web g, and a right lower wing along the plate surface h. When prefabricating the film, it is prefabricated into a sealant film with a suitable length, width, and thickness by manual cutting or mechanical cutting.

[0031] (1) Select the sealant colloid as vulcanized anti-corrosion sealant, such as MS sealant, silicone sealant, etc. Taking polysulfide sealant in vulcanized anti-corrosion sealant as an example, polysulfide sealant is a product that can be purchased in the market and is used as the colloid material for making the film. Polysulfide sealant has excellent heat resistance and atmospheric aging resistance, and is suitable for occasions exposed to the external environment for a long time. Polysulfide sealant has good adhesion to most materials and can firmly adhere to various substrates. Therefore, in bridge construction, maintenance, and repair construction, vulcanized anti-corrosion sealants such as polysulfide sealant are commonly used sealant colloids.

[0032] (2) Uniformly coat the colloid on the mold, and the thickness is controlled by the coating blade.

[0033] (3) Use the coating blade to level the surface of the colloid to make the thickness uniform. The thickness is divided into four types: 3mm, 4mm, 5mm, and 6mm.

[0034] (4) Let the static and leveled colloid cure at room temperature to form a solid shape, and the curing time is not less than 4 hours.

[0035] (5) After the colloid cures, a sealant film is formed.

[0036] Figure 2 This is a physical picture of the film made by this production method. The black part in the picture is the sealant film.

[0037] Step S3: Scrape a layer of sealant on the surface of the steel structure member to form a sealant bonding coating. This sealant is a paste wet glue, and the coating thickness is 0.5 - 2mm. Before coating, the steel structure member needs to be cleaned. The surface of the paint coating should be smooth and flat as a whole, without bubbles, pits, dry, clean, dust-free, rust-free, oil-free, and without weld beads, spines, etc. with a height exceeding 2mm. The sealant to be coated should be consistent with the material of the sealant patch. For example, if the material used for the patch is polysulfide glue, the scraping layer must also be polysulfide glue of the same material, which can make the two better fuse in the subsequent pasting process to ensure the tightness of the fit.

[0038] Step S4: Coat the matching sealant film on the sealant bonding coating on the surface of the matching steel structure member to complete the coating of the steel structure member. At this time, it is necessary to check and pay attention to the butt joint fit of the patch to ensure the comprehensive protection of the patch. The bolt after coating is as Figure 3 shown. The outer layer of bolt 1 is the bonding coating 2, and the outermost layer is the sealant film 3.

[0039] A large number of bolts are required on the bridge, such as Figure 4As shown. Usually, a single anchor rod is 20 - 30 meters long, and several or more than a dozen anchor rods in each row are connected in parallel by means of continuous connection. And dozens of rows need to be set up for an anchor rod group. Therefore, the number of anchor rods required is extremely large. As a result, the construction period for the protection of anchor rods is very long. However, with the coating method of the present invention, prefabricated sealant films are prepared in advance. During coating, it only needs to stick the prefabricated sealant films on the steel structure components in the form of patches to complete the protection work. Its workload can be greatly reduced, the prefabrication period will also be greatly shortened, and the uniformity of the thickness of the protective layer can be ensured, achieving the consistency of the protection quality.

[0040] Since the sealant material selected for this sealant patch has a very wide temperature adaptability, the coating method of the present invention can be applied to bridges in areas with higher temperatures, such as southern provinces of our country, and can also be used on bridges in areas with lower temperatures, such as northern provinces of our country.

[0041] Of course, the coating method of the present invention, in addition to being used on the main steel structure components of bridges (cable-stayed bridges and suspension bridges), such as the main cables, cable clamps, suspension cables, air clamps, suspension cable anchor rods, fork-shaped lugs, stay cables, stay cable anchor rods and other main steel structure components of bridges, can also be used for the protection treatment of other steel structures other than bridges.

[0042]

Example 2

[0043] In the application scenario of Example 1, the coating work of the main steel structure components of the bridge is carried out in the factory for coating treatment, and then transported to the construction site for installation after completion. In the application scenario of this embodiment, there are two applicable situations. Situation 1: Most of the coating work of the steel structure components is completed in the factory, and a small part is carried out on the construction site for coating. For example, the joint part between the anchor rod and the concrete, and the connection part between the anchor rods are more suitable for on-site coating and can better ensure the construction quality. Situation 2: After the steel structure is installed and the bridge is in the maintenance stage, the surface of the anchor rod may be locally damaged due to weather or human factors. The sealant film can be cut according to the size of the damaged surface for local pasting treatment. This repair method is both fast and can ensure the thickness and coating quality.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to this. All changes that can be made within the knowledge scope of those skilled in the art without departing from the gist of the present invention are within the protection scope of the claims of the present invention.

Claims

1. A new type of sealant coating method for the surface of the main steel structure components of a bridge, characterized in that: The following steps are involved: Step S1, obtaining data of each surface of the pre-coated steel structure component; Step S2, making a suitable sealant film according to the component surface data; Step S3, applying a layer of sealant on the surface of the cleaned steel structure component to form an adhesive coating; Step S4: stick the sealant film on the bonding coating on the surface of the matching steel structure component to complete the coating of the steel structure component.

2. The method for applying sealant on the surface of the main steel structure member of the new bridge according to claim 1 is characterized in that: The sealant film is formed by laying out a sealant colloid according to a set thickness and curing it at room temperature.

3. The method for applying sealant on the surface of the main steel structure member of the new bridge according to claim 2 is characterized in that: The sealant colloid type is vulcanized sealant.

4. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 1 is characterized in that: The sealant used in the bonding coating and the sealant film are made of the same type of material.

5. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 1 is characterized in that: The thickness of the sealant film is 3-6 mm.

6. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 1 is characterized in that: The thickness of the adhesive coating is 0.5-2 mm.

7. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 2 is characterized in that: The sag of the sealant colloid is ≤1mm.

8. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 2 is characterized in that: The molding time of the sealant film at room temperature is ≥ 4 hours.

9. The method for applying sealant on the surface of the main steel structure member of a new bridge according to claim 2 is characterized in that: The thickness error of the sealant film is ±0.5mm.

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