Highway bridge deck concrete construction method

Abstract

The invention provides a highway bridge deck concrete construction method, and belongs to the technical field of bridge highway engineering. The highway bridge deck concrete construction method comprises the following steps that S1, a bridge deck base layer is cleaned; s2, laying a steel template; s3, steel bars and meshes are laid, the steel bars and the meshes which are arranged in a crossed and layered mode are laid in the formwork, and the steel bars and the meshes are connected with pre-buried shear-resistant steel bars of the beam plate in a welded mode; s4, concrete pouring; and S5, concrete curing. Dry and hard laitance protruding blocks and loose concrete on the surface of a bridge are cleaned, it is ensured that the bridge floor is flat and free of sundries, and angle steel and structural steel formworks are arranged at the positions away from the inner edge of a guardrail and the center line of the bridge floor, and steel bars and meshes which are arranged in a crossed and layered mode are laid in the formworks. The subsequently poured concrete has a larger adhesion area, so that the concrete poured in the template is more stable, and the surface concrete is not easy to fall off even if the wheels are rolled on the bridge floor for a long time.

Description

Technical Field

[0001] The invention relates to the field of bridge and highway engineering, and in particular to a highway bridge deck concrete construction method. Background Art

[0002] Bridge pavement concrete construction is a complex and delicate process. The bridge deck concrete construction process mainly includes key steps such as bridge deck cleaning and preparation before construction, steel structure formwork laying, concrete pouring construction, construction precautions, construction quality inspection and post-construction maintenance to ensure that the laid asphalt layer has excellent durability and driving comfort.

[0003] During the pouring construction of bridge deck concrete in the prior art, the steel structure formwork erected on the bridge deck has a simple structure, and the contact area between the steel bars laid inside and the poured concrete is small, resulting in the concrete poured on the bridge surface being easily detached under the frequent rolling and vibration of vehicles. Summary of the invention

[0004] In order to remedy the above deficiencies, the present invention provides a highway bridge deck concrete construction method, which aims to improve the problem that the contact area between the steel bars laid inside the bridge deck concrete and the poured concrete is small, resulting in the concrete poured on the bridge surface being easily fallen off under the frequent rolling and vibration of vehicles.

[0005] The present invention is achieved in that:

[0006] The present invention provides a highway bridge deck concrete construction method, comprising the following steps:

[0007] S1: Clean the bridge deck base, remove the floating slurry and loose concrete on the bridge deck, and ensure that the bridge deck surface is flat and free of debris;

[0008] S2: Steel formwork laying, angle steel and structural steel formwork are set at the inner edge of the guardrail and the center line of the bridge deck;

[0009] S3: Laying steel bars and meshes, laying cross-layered steel bars and meshes inside the formwork, and welding them to the pre-embedded shear steel bars in the beams and slabs;

[0010] S4: Concrete pouring, pouring concrete inside the formwork and subsequent leveling using equipment;

[0011] S5: Concrete curing: After pouring, cover with geotextile or plastic film and sprinkle water for curing.

[0012] In one embodiment of the present application, the bridge deck base is cleaned and chiseled to remove the slurry and loose concrete along the middle of the bridge deck to the base of the guardrail.

[0013] In one embodiment of the present application, after the bridge deck base is cleaned, an air compressor is used to assist in manual flushing of the bridge deck to clean dust, laitance and loose concrete from the bridge deck.

[0014] In one embodiment of the present application, the angle steel in the step of laying the steel bars and mesh is set 15 cm from the inner edge of the guardrail and at the center line of the bridge deck.

[0015] In one embodiment of the present application, in the step of laying the steel bars and mesh, before laying the steel mesh, check the shear steel bars embedded on the top of the beam and slab to ensure that they are vertical and adjusted in place.

[0016] In one embodiment of the present application, the concrete pouring step is to pour concrete from downhill to uphill, and ensure continuous pouring. After pouring, the concrete is manually flattened and vibrated to make it dense using a vibrating rod in a flat-dragging manner.

[0017] In one embodiment of the present application, before the concrete pouring step, the bridge deck is fully moistened by a watering device to improve adhesion.

[0018] In one embodiment of the present application, during the concrete curing step, the concrete needs to be covered with straw mats or quilts for insulation during construction in low temperature weather.

[0019] In one embodiment of the present application, the curing period in the concrete curing step is not less than 7 days.

[0020] The beneficial effects of the present invention are as follows: the present invention obtains a highway bridge deck concrete construction method through the above design, cleans the dry and hardened slurry bumps and loose concrete on the bridge surface, ensures that the bridge deck is flat and free of debris, and sets angle steel and structural steel templates at the inner edge of the guardrail and the center line of the bridge deck, and lays cross-layered steel bars and mesh inside the template. The subsequent poured concrete has a larger adhesion area, that is, the concrete poured inside the template is more stable, and the surface concrete is not easy to fall off due to the long-term rolling of wheels on the bridge deck. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example

[0023] The present invention provides a highway bridge deck concrete construction method, comprising the following steps:

[0024] S1: Clean the bridge deck base, remove the slurry and loose concrete on the bridge deck, and ensure that the bridge deck surface is flat and free of debris.

[0025] Cleaning loose concrete on the bridge deck Through effective cleaning and repair measures, the safety and durability of the bridge deck can be ensured. The cleaning methods of hard slurry bumps and loose concrete on the bridge deck can be divided into manual cleaning or mechanical cleaning. The main method of manual cleaning is to use tools such as hammers and shovels to manually knock out and shovel loose concrete blocks on the bridge deck. This method is suitable for small areas or areas where loose concrete is concentrated. The cleaning method using mechanical equipment is to use mechanical equipment such as crushers for cleaning. After the slurry and loose concrete are cleaned, the high-pressure water flow generated by the high-pressure water gun is used to flush away the loose concrete on the bridge deck. This method requires a large water flow pressure and ensures that no damage is caused to other parts of the bridge deck during the flushing process.

[0026] In addition to manual removal and mechanical equipment to remove slurry and loose concrete, you can also use concrete cleaning agents for removal. Choose a special concrete cleaning agent and spray it on the loose concrete area. These cleaning agents can react with the components in the concrete, making it easier to remove. When using cleaning agents, you need to ensure that the work area is well ventilated and protect your skin and eyes from harm. This method is efficient, but you need to pay attention to operating safety to avoid damage to the bridge deck structure.

[0027] The precautions for cleaning the floating slurry and loose concrete on the bridge deck are as follows: 1. During the cleaning process, strictly abide by the safety operating procedures and wear personal protective equipment, such as helmets, gloves, goggles, etc. 2. During the cleaning process, pay attention to prevent the pollution of the environment by concrete fragments and cleaning agents. Measures such as collecting fragments and properly handling cleaning agents can be taken to reduce the impact on the environment. 3. After the cleaning is completed, the bridge deck must be protected and repaired as necessary, such as applying waterproof coatings and repairing cracks. This helps to extend the service life of the bridge deck and improve the bearing capacity of the bridge. 4. Before cleaning, a comprehensive assessment of the loose concrete on the bridge deck must be conducted to determine the scope and depth of the cleaning. After the cleaning is completed, the bridge deck must be monitored to ensure that the cleaning effect meets the requirements and that new problems are discovered and handled in a timely manner.

[0028] S2: Steel formwork laying, angle steel and structural steel formwork are set at the inner edge of the guardrail and the center line of the bridge deck. The angle steel in the step of laying steel bars and mesh is set 15cm from the inner edge of the guardrail and the center line of the bridge deck. In the step of laying steel bars and mesh, before laying the steel mesh, check the shear steel bars embedded on the top of the beam and slab to ensure that they are vertical and adjusted in place.

[0029] The construction of bridge concrete pavement formwork includes formwork selection: steel formwork is preferred because it is straight, flat, strong and durable. If wooden formwork is used, it should be solid, less deformed, free of decay, distortion or cracks, and must be soaked before use. Formwork installation: The formwork should be installed firmly, straight, flat and free of distortion. The connection between adjacent formworks should be tight and smooth, and no misalignment is allowed. The contact surface between the formwork and the concrete and the top surface of the formwork should be planed and coated with an isolation agent. The joints should be sealed with tape or plastic film to prevent leakage. Formwork support: According to the material and size of the formwork, appropriate support devices should be set to ensure that the formwork does not deform or move during the pouring process.

[0030] S3: Laying steel bars and meshes. Lay cross-layered steel bars and meshes inside the formwork, and weld them to the pre-embedded shear steel bars in the beams and slabs.

[0031] The steel bars inside the formwork are laid inside the steel structure formwork, the mesh is laid on the top of the steel bars, and the steel bars are welded to the beams and the mesh. The mesh laid on the top of the steel bars increases the contact area between the poured concrete and the metal sheet, making the surface of the concrete poured inside the formwork more stable.

[0032] Rebar setting includes rebar inspection: Before installation, the raw material type, specification and processing quality of the rebar should be checked to confirm that they meet the design requirements and specifications. Rebar installation: Rebar mesh, corner rebars, etc. should be installed firmly and accurately. The force transmission rod should also be installed firmly and accurately, and installed together with the expansion plate and the seam lifting plate. Rebar protection: During the installation of rebar, care should be taken to protect the rebar from damage and avoid rust or deformation.

[0033] S4: Concrete pouring, pouring concrete inside the formwork and subsequently using equipment for leveling operations. The concrete pouring step is to pour concrete from downhill to uphill, and ensure continuous pouring. After pouring, the concrete is manually flattened and vibrated to compactness using a vibrating rod in a flat dragging manner.

[0034] The leveling process after concrete pouring includes the steps of preliminary leveling, secondary leveling and self-leveling. During the construction process, attention should be paid to issues such as material quality, construction environment, construction specifications and post-maintenance to ensure the flatness and quality of the concrete floor. The leveling operation of concrete includes the following steps: Preliminary leveling: Vibration. After the concrete is poured, it should be vibrated immediately to remove bubbles and voids in the concrete and improve the density and uniformity of the concrete. The vibration time should be well controlled to ensure sufficient vibration and prevent segregation and water seepage caused by over-vibration. Scraping. After vibration, use a scraper or scraper to scrape the concrete surface flat, remove excess concrete and protruding parts, and make the surface basically flat. Secondary leveling: Smoothing before initial setting. When the concrete is initially set, use a wooden trowel or iron trowel for the first leveling. The purpose of this leveling is to smooth out the small pits, bubble eyes, sand eyes and footprints on the surface layer to make the surface layer more compact and flat. Before final setting, apply the second application of pressure about 3 to 4 hours after the first application, before the concrete is about to set. The force of this application should be slightly greater than the first time. Use an electric trowel or a more professional troweling tool to smooth and flatten the trowel pattern to ensure that the entire surface is flat and smooth. Self-leveling treatment: Evaluation: If there are large unevenness or depressions on the concrete floor, consider using self-leveling concrete for treatment. Self-leveling concrete has good fluidity, can automatically fill low-lying areas, and form a hard surface within a few hours. Construction: Follow the construction instructions of the self-leveling concrete to ensure that the floor is clean, moist, and coated with an interface agent. Then, pour the self-leveling concrete on the ground, scrape it flat with a scraper or special tool, and use a defoaming roller to eliminate bubbles.

[0035] Precautions for concrete pouring include: Construction environment. During construction, the site should be kept clean to prevent debris and dust from contaminating the concrete surface. At the same time, pay attention to weather changes and avoid construction on rainy or windy days. Construction specifications. Strictly follow the construction specifications and operating procedures to ensure that the construction quality meets the requirements. In particular, the time and strength of vibration, scraping and pressing should be controlled to avoid over-vibration, over-pressing or under-pressing.

[0036] S5: Concrete curing: After pouring, cover with geotextile or plastic film for watering and curing. In the concrete curing step, straw mats or quilts should be covered for insulation in low temperature weather. The curing period in the concrete curing step is not less than 7 days.

[0037] The maintenance process after pouring bridge deck concrete is crucial to ensure the strength, durability and service life of the bridge deck. The maintenance process after concrete pouring includes the start time and conditions of maintenance: time selection, usually within 8 to 12 hours after the bridge deck concrete is poured, the maintenance work begins. The specific time depends on the concrete preparation, temperature and humidity and other conditions. Environmental conditions, during maintenance, the bridge deck concrete should be kept in a suitable temperature and humidity environment to avoid the concrete drying too quickly or cracking. The maintenance methods include natural maintenance: watering maintenance, using straw mats, sacks and other coverings to cover the bridge deck concrete, and frequently watering to keep it moist. The frequency of watering should be determined according to environmental conditions such as temperature and humidity to keep the concrete in a moist state. Spraying plastic film maintenance, for tall structures or large-area concrete structures that are not easy to water, such as bridge decks, perchloroethylene resin plastic solution can be sprayed on the concrete surface with a spray gun to form a thin film to isolate the concrete from the air and prevent the evaporation of water in the concrete. Use curing membrane: Curing membrane is a polymer material that can turn flowing water into solid water and continuously penetrate into the surface of concrete. This curing method can effectively prevent the occurrence of cracks and ensure the strength of concrete. Steam curing: In some special cases, such as when the temperature is low or when it is necessary to accelerate the hardening of concrete, steam curing can be used. Place the bridge deck concrete components in a curing room filled with saturated steam or a mixture of steam and air to accelerate the hardening of concrete in a high temperature and humidity environment. Curing time: The curing time depends on the formulation and temperature conditions of the concrete. The curing time of concrete made of silicate cement shall not be less than 7 days, and the curing time of concrete with impermeability requirements shall not be less than 14 days. For important structures such as bridge decks, the curing time should be appropriately extended to ensure sufficient hardening and strength development of the concrete.

[0038] Precautions during the maintenance process include covering and moisturizing: During the maintenance process, ensure that the bridge deck concrete is fully covered and kept moist. Avoid direct exposure of concrete to sunlight or adverse conditions such as wind and rain. Maintenance water: The maintenance water should be consistent with the mixing water to avoid adverse effects on concrete due to different water quality. Inspection and recording: During the maintenance process, the humidity, temperature and surface condition of the bridge deck concrete should be checked regularly, and relevant data should be recorded. If any abnormality is found, measures should be taken in time to deal with it. Post-maintenance inspection: The maintenance time is up to standard. When the maintenance time reaches the specified requirements, the maintenance work can be ended. Surface inspection, check the surface of the bridge deck concrete to ensure that there are no cracks, peeling, shedding, etc. Strength test, by drilling concrete core samples or rebound testing, check whether the strength of the bridge deck concrete meets the design requirements.

[0039] This highway bridge deck concrete construction method cleans the dry and hardened slurry bumps and loose concrete on the bridge surface to ensure that the bridge deck is flat and free of debris. Angle steel and structural steel formwork are set at the inner edge of the guardrail and the center line of the bridge deck, and cross-layered steel bars and mesh are laid inside the formwork. The subsequent poured concrete has a larger adhesion area, which makes the concrete poured inside the formwork more stable, and the surface concrete is not easy to fall off due to the long-term rolling of wheels on the bridge deck.

[0040] In the above specific implementation, the bridge deck base is cleaned and chiseled to remove the floating slurry and loose concrete along the middle of the bridge deck to the root of the guardrail. After the bridge deck base is cleaned, an air compressor is used to assist in manual flushing of the bridge deck to clean the dust, floating slurry and loose concrete on the bridge deck.

[0041] Among them, the main application of air compressors in bridge deck construction is usually to clean the bridge deck to ensure that there is no floating slurry, dust, dirt and oil on the surface, to ensure that the bridge deck is smooth, clean and dry, and to provide a good foundation for subsequent bridge deck waterproofing layer construction or concrete pouring. The specific operation steps include air compressor preparation: Check the air compressor to ensure that the air compressor works normally, there is no oil leakage or air leakage, and the compressed air output pressure is stable. Connect the pipeline, connect the air compressor to the appropriate pipeline, ensure that the pipeline is not damaged and the connection is tight to avoid compressed air leakage. Adjust the pressure, adjust the output pressure of the air compressor according to the needs of bridge deck cleaning. Generally speaking, higher pressure can provide a stronger blowing effect, but it may also cause damage to the bridge deck, so it needs to be selected according to the actual situation. Bridge deck cleaning: Divide the area, divide the bridge deck into several areas, so that the cleaning work can be carried out in an orderly manner. Start blowing, turn on the air compressor, transport the compressed air to the bridge deck through the pipeline, and use the airflow to blow away the floating slurry, dust, dirt and oil on the bridge deck. During the blowing process, you can hold the pipe and move it back and forth on the bridge deck to ensure that every corner is fully blown. Check the effect. After the blowing is completed, carefully check whether there is any residue on the bridge deck. If necessary, you can blow again until the bridge deck is completely clean.

[0042] The precautions when using an air compressor to clean the bridge deck are: safe operation. When using an air compressor to clean the bridge deck, the safety operating procedures should be strictly followed to avoid accidents. For example, do not put your fingers or other objects into the pipe mouth to avoid being damaged by compressed air. Protect the environment. During the purge process, try to avoid blowing pollutants into the surrounding environment. If possible, a collection device can be set up under the bridge deck to collect the pollutants blown down. Protect the bridge deck. Although the airflow generated by the air compressor usually does not cause direct damage to the bridge deck, you still need to pay attention to protecting the bridge deck during the purge process. For example, avoid using too high a pressure for purge to avoid scratches or wear on the bridge deck.

[0043] In the above specific implementation manner, before the concrete pouring step, the bridge deck is fully moistened by a watering device to improve adhesion.

[0044] In addition to wetting the bridge deck to improve the adhesion of poured concrete, the following measures can also be taken to improve the adhesion between concrete and the bridge deck. Bridge deck pretreatment: Clean the bridge deck. Before pouring concrete, the bridge deck must be thoroughly cleaned to remove all dust, oil, loose objects and other impurities. These impurities will weaken the bonding strength between the concrete and the bridge deck. You can use tools such as high-pressure water guns, wire brushes or shot blasting machines to clean and ensure that the bridge deck is clean and free of dirt. Bridge deck shot blasting. Shot blasting is an effective way to pretreat the bridge deck. It can increase the roughness of the bridge deck and improve the mechanical bite force between the concrete and the bridge deck. The bridge deck after shot blasting should form a uniform and rough surface without floating slurry and sand, and will not damage the original structure and flatness. Repair bridge deck defects. If there are cracks, potholes and other defects on the bridge deck, appropriate repair materials should be used to repair them to ensure that the bridge deck is flat and defect-free. The repair material should have good compatibility with the original bridge deck material to ensure the bonding strength between the repaired bridge deck and concrete. Concrete mix ratio and material selection: Optimize the concrete mix ratio. By adjusting the concrete mix ratio, the fluidity, cohesiveness and water retention of concrete can be improved, thereby improving its adhesion to the bridge deck. The sand ratio can be appropriately increased, a low amount of water reducer can be used, and an appropriate amount of thickener or air entraining agent can be added to improve the cohesiveness and fluidity of concrete. Selecting high-quality materials and using high-quality cement, aggregates and admixtures can ensure the strength and durability of concrete and improve its bonding strength to the bridge deck. High-quality ultrafine particle admixtures such as fly ash and silica fume can increase the fluidity of concrete, reduce water seepage, and reduce segregation, thereby improving its bonding to the bridge deck. Control measures during construction: Strictly control the construction quality. During the construction process, the pouring speed, vibration intensity and vibration time of concrete should be strictly controlled to ensure full contact and close bonding between the concrete and the bridge deck. Excessive or insufficient vibration should be avoided to avoid damage to the concrete or affect the bonding strength between it and the bridge deck. Use an interface agent. Applying a layer of interface agent between the concrete and the bridge deck can significantly improve the bonding strength between them. The interface agent should have good wettability and permeability, and be able to penetrate into the tiny pores of the bridge deck to form a strong chemical bond. Strengthen maintenance. After the concrete is poured, the maintenance work should be strengthened to ensure that the concrete is fully hardened and solidified. The bridge deck should be kept moist during the maintenance period to prevent the concrete from cracking or peeling due to drying.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highway bridge deck concrete construction method, characterized in that: The steps include: S1: Clean the bridge deck base, remove the floating slurry and loose concrete on the bridge deck, and ensure that the bridge deck surface is flat and free of debris; S2: Steel formwork laying, angle steel and structural steel formwork are set at the inner edge of the guardrail and the center line of the bridge deck; S3: Laying steel bars and meshes, laying cross-layered steel bars and meshes inside the formwork, and welding them to the pre-embedded shear steel bars in the beams and slabs; S4: Concrete pouring, pouring concrete inside the formwork and subsequent leveling using equipment; S5: Concrete curing: After pouring, cover with geotextile or plastic film and sprinkle water for curing.

2. A highway bridge deck concrete construction method according to claim 1, characterized in that: The method of cleaning and chiseling the bridge deck base to remove the floating slurry and loose concrete is along the middle of the bridge deck to the base of the guardrail.

3. A highway bridge deck concrete construction method according to claim 1, characterized in that: After the bridge deck base is cleaned, an air compressor is used to assist in manual flushing of the bridge deck to clean dust, laitance and loose concrete on the bridge deck.

4. A highway bridge deck concrete construction method according to claim 1, characterized in that: The angle steel in the step of laying the steel bars and mesh is set at 15 cm from the inner edge of the guardrail and at the center line of the bridge deck.

5. A highway bridge deck concrete construction method according to claim 1, characterized in that: The steps of laying steel bars and meshes include checking the pre-buried shear steel bars on the top of the beams and slabs before laying the steel meshes to ensure that they are vertical and adjusted in place.

6. A highway bridge deck concrete construction method according to claim 1, characterized in that: The concrete pouring step is to pour concrete from downhill to uphill and ensure continuous pouring. After pouring, the concrete is manually flattened and vibrated to be dense by a flat dragging method using a vibrating rod.

7. A highway bridge deck concrete construction method according to claim 1, characterized in that: Before the concrete pouring step, the bridge deck is fully moistened by watering equipment to improve adhesion.

8. A highway bridge deck concrete construction method according to claim 1, characterized in that: In the concrete curing step, during construction in low temperature weather, straw mats or quilts need to be covered for insulation.

9. A highway bridge deck concrete construction method according to claim 8, characterized in that: The curing period in the concrete curing step is not less than 7 days.