In recent years, the application of concrete wet spraying trucks has rapidly developed and received widespread attention in various engineering projects. The reasons for its rapid development can be mainly attributed to the following five aspects:

　　1. Significant advantages of wet spraying technology

　　Wet spraying technology has demonstrated numerous advantages during the construction process. Compared with traditional dry spraying techniques, wet spraying technology has four significant advantages. Firstly, wet spraying technology can significantly reduce the dust concentration on construction sites, effectively eliminating potential hazards to workers' health. Secondly, the production efficiency of the concrete wet spraying trolley is extremely high, capable of spraying 10 to 30 cubic meters of concrete per hour, greatly accelerating the construction progress. In addition, the rebound rate of wet spraying technology is relatively low, which can reduce the rebound rate of concrete to below 10%, reduce material waste, and save costs. Finally, the wet spraying process, due to its easily controllable water cement ratio, can significantly improve the uniformity of concrete and ensure higher construction quality.

　　2. Strict environmental requirements and policy support

　　With the increasingly strict domestic environmental regulations, the demand for mechanized construction is becoming more urgent. National policies and relevant industry standards clearly encourage and support the use of wet spraying technology, which not only meets environmental requirements but also promotes the improvement of construction efficiency and quality. Therefore, the application of wet spray trucks has been strongly promoted at the policy level and has become the preferred equipment for many engineering projects.

　　3. Rising labor costs drive mechanization

　　In recent years, labor costs have continued to rise, and traditional manual construction methods have gradually lost their advantages in terms of cost and efficiency. In contrast, the mechanized operation method of concrete wet spraying trolley not only improves construction efficiency, usually more than twice that of manual labor, but also reduces dependence on labor, reduces personnel risks and management costs. Therefore, using wet spray trucks for construction has become a wise choice for more and more projects.

　　4. Technological progress and market maturity of domestic manufacturers

　　Domestic concrete wet spraying truck manufacturers have made significant progress in research and technological innovation. With the gradual maturity of product technology, standardized and serialized wet spray truck products have emerged in the market. These technological advancements not only improve the reliability and stability of equipment, but also make products more competitive in the market and widely favored by customers.

　　5. A comprehensive after-sales service system

　　The continuous improvement of the after-sales service system provides strong support for the widespread application of concrete wet spraying trucks. Manufacturers provide comprehensive operational training, technical support, and maintenance services to make equipment use and maintenance more convenient, effectively extending the service life of the equipment. This comprehensive after-sales service further promotes the popularization and application of wet spray trucks in various construction projects.

　　The concrete wet spraying trolley, with its technological advantages, policy support, cost-effectiveness, technological progress, and comprehensive after-sales service, has achieved rapid development in modern engineering construction and gradually become an indispensable key equipment in tunnel construction and other fields.

　　In modern tunnel and mining projects, the application of rock drilling rigs has become one of the key technologies to improve construction safety, efficiency and quality. This advanced mechanical equipment, with its unique advantages, is gradually replacing the traditional manual drilling method, leading the industry to a more intelligent and automated direction.

　　1. A leap in safety performance

　　In tunnel excavation operations, the safety of operators is always the primary consideration. The rock drilling rig is equipped with a dedicated anti-rockfall cab, which provides operators with a safe working environment away from the face. This design not only avoids direct contact with potential rockfall hazards, but also reduces health risks caused by harsh environments, greatly improving the safety of operations.

　　2. Double guarantee of construction efficiency and speed

　　Compared with traditional manual drilling methods, rock drilling rigs show significant advantages in construction efficiency. Its drilling speed is far higher than that of manual drilling, and it can quickly complete drilling operations, greatly shortening the construction period. Especially in large-scale tunnel excavation projects, this efficient operation method can significantly improve the progress of the overall project and save valuable time for the project.

　　3. Effective control of labor costs

　　Using drilling rigs for drilling operations can significantly reduce dependence on manpower. The increase in automation means that fewer operators can complete more work, which effectively reduces labor costs. In addition, due to the improvement in construction efficiency, the overall cost of the project can be optimized, bringing higher economic benefits to engineering contractors.

　　4. Revolutionary improvement in construction quality

　　The precise positioning and stable propulsion capabilities of the drilling rig make it far superior to manual operation in terms of drilling quality. Once the drill rod is fixed, high-precision propulsion can be achieved regardless of horizontal or specific inclination angles to ensure that the drilling position is accurate. This not only reduces the amount of over-excavation, but also ensures the accuracy of excavation and forming, making the final tunnel structure more in line with design requirements and improving the overall quality of the project.

　　In summary, the application technology advantages of the drilling rig are significant, which not only improves the safety and efficiency of tunnel and mining projects, but also effectively controls costs and improves construction quality. With the continuous advancement of technology, the drilling rig will play a more important role in future engineering practices and become a key force in promoting industry innovation and development.

　　In rock excavation projects such as mines and tunnels, drill rigs are key equipment, and their efficient operation directly affects the progress and cost of the project. However, drill stuck problems frequently plague construction personnel, not only reducing work efficiency, but also causing equipment damage. This article will explore the five major causes of drill stuck drills and propose corresponding prevention and solution strategies.

　　1. Improper anti-stuck pressure setting

　　The anti-stuck device is an effective tool to prevent drill stuck, but if the anti-stuck pressure setting value is too high, the equipment will not respond in time when the drill is really stuck. The correct setting value should ensure that when the drill stuck pressure reaches a certain threshold, the anti-stuck device can be quickly activated and the drill bit can be safely pulled out of the rock hole through reverse feeding.

　　2. Drill bit wear and damage

　　New drill bits or newly repaired drill bits have a certain taper, which helps drilling operations. However, in abrasive rocks, such as those with a high quartz content, the wear around the drill bit will gradually form an inverted cone. In severe cases, the drill bit will form a barb, which is difficult to withdraw from the rock hole, causing the drill to get stuck.

　　3. The influence of rock cracks

　　The cracks in the rock are like natural drill traps. When the drill bit enters these cracks, the squeezing effect of the rock will significantly increase the rotational resistance, causing the drill bit to get stuck and making it difficult to continue to advance or withdraw.

　　4. Insufficient drilling flushing

　　The flushing water is not only used to remove rock debris in the borehole, but also plays a role in cooling the drill bit and reducing friction. If the flushing water pressure is too low and the rock debris is not completely removed, the friction encountered by the drill bit during drilling will increase, the rotational resistance will increase, and eventually the drill bit will get stuck in the rock hole.

　　5. Hydraulic oil selection and ambient temperature

　　The viscosity of the hydraulic oil is significantly affected by temperature. In a low temperature environment, the viscosity of the hydraulic oil increases, which may cause the rotational resistance to exceed the set rotational pressure, thereby causing the drill to get stuck. Therefore, it is crucial to select hydraulic oil suitable for the current ambient temperature to maintain the stable operation of the hydraulic system.

　　The drill bit sticking problem of the drilling rig involves multiple factors, including equipment settings, drill bit status, geological conditions, flushing system efficiency and hydraulic oil selection. By comprehensively considering these factors, reasonably setting the anti-stuck pressure, regularly checking and maintaining the drill bit, optimizing the flushing water system, and selecting suitable hydraulic oil, the drill bit sticking phenomenon can be effectively prevented, the normal operation of the drilling rig can be guaranteed, and the engineering efficiency and safety can be improved.

　　As an indispensable and important equipment in modern tunnel engineering, the stability of its performance directly affects the quality and progress of construction. Therefore, regular systematic inspection and maintenance of wet concrete spraying machine equipment is the key to ensure its normal operation and extend its service life. This article will introduce in detail how to conduct a comprehensive system inspection of wet concrete spraying machine equipment before construction to ensure smooth construction.

　　I. Pumping system inspection

　　1. Hydraulic system inspection

　　- Hydraulic pipeline connection: First check whether there is oil seepage or oil leakage at the connection points of each pipeline in the hydraulic system. If any leakage is found, stop using it immediately, find the oil leakage point and repair it in time.

　　- Oil stain inspection: Whether there is oil stain on the ground is also an important basis for judging whether the equipment is normal. Oil stains on the ground usually indicate that the equipment is leaking oil, which should be given enough attention.

　　2. Hydraulic oil tank oil level inspection

　　- Oil level monitoring: The oil level in the hydraulic oil tank must be within the range required by the level gauge. If the oil level is lower than the standard, the equipment may not operate normally, so the oil must be replenished in time to ensure that the hydraulic system of the equipment can maintain normal pressure.

　　3. Pumping system water tank inspection

　　- Water volume monitoring: Check whether there is enough clean water in the water tank to ensure the normal operation of the cooling and lubrication system when the equipment is running. If the water volume is insufficient, it should be replenished in time.

　　II. Lubrication system inspection

　　1. Automatic lubrication pump inspection

　　- Lubricating oil level: Check whether the lubricating oil in the oil box of the automatic lubrication pump is sufficient. Insufficient lubricating oil may cause wear of the equipment when it is running under high load. Pay attention to replenishing sufficient lubricating oil during each inspection.

　　2. Manual lubrication point maintenance

　　- Grease gun operation: Use a grease gun to lubricate the manual lubrication points on the equipment to ensure that all moving parts are in good lubrication condition. This operation helps to reduce the wear rate of the equipment and extend its service life.

　　III. Accelerator system inspection

　　- Accelerator box inspection: The adequacy of the accelerator directly affects the spraying effect of the concrete. Therefore, before each construction, the reserve in the quick-setting agent box should be checked. If it is insufficient, it should be replenished in time to ensure that the concrete can set quickly during construction.

　　IV. Inspection of other key components

　　1. Nozzle inspection

　　- Check whether the concrete nozzle is worn. The wear of the nozzle will directly affect the spraying effect of the concrete and needs to be replaced in time.

　　2. Inspection of the delivery pipeline

　　- Concrete delivery hose and steel pipe: Check whether the concrete delivery hose and steel pipe have wear, cracks or other signs of damage to ensure the integrity of the pipeline.

　　- Hydraulic oil pipe and air duct: Check the hose and steel pipe parts of the hydraulic oil pipe and air duct. If they are severely worn, they should be replaced in time to prevent the equipment from malfunctioning during high-pressure operation.

　　System inspection of concrete wet spraying machine equipment is an important part of ensuring construction quality and safety. Through a comprehensive inspection of the pumping system, lubrication system and key components, equipment failure can be effectively prevented, construction efficiency can be improved, and the smooth progress of the project can be ensured. Regular maintenance and inspection not only extend the service life of the equipment, but also reduce the risk of downtime due to equipment failure during construction.

　　Concrete spraying machine is a construction equipment specially used for spraying concrete onto the tunnel wall. This equipment plays a key role in tunnel construction, especially in providing initial support and structural reinforcement.

　　Concrete spraying machine can be divided into two categories: dry spraying machine and wet spraying machine

　　- Dry spraying machine: Dry spraying machine transports dry mixture to the nozzle through a pipe, and then mixes it with water at the nozzle and sprays it onto the tunnel wall. Dry spraying machine equipment is relatively simple and suitable for small-scale spraying operations, but it is easy to generate a lot of dust during the spraying process, and the construction environment is relatively harsh.

　　- Wet spraying machine: Wet spraying machine transports wet concrete that has been mixed with water to the nozzle through pumping, and then sprays it onto the tunnel wall with the help of compressed air. The advantages of wet spraying machine are less dust, better construction environment, more uniform spraying effect, higher cohesion and density of concrete, so it has been widely used in modern tunnel construction.

　　Main features of concrete spraying machine

　　- Efficient construction: concrete spraying machine can spray concrete quickly and over a large area, which improves construction efficiency.

　　- Uniform spraying: The thickness of the sprayed concrete layer is uniform and can form a solid protective layer.

　　- Construction safety: Compared with traditional manual spraying, the use of spraying machine for construction can reduce the time that construction workers are exposed to dangerous environments and improve construction safety.

　　Applicable scenarios of concrete spraying machine

　　Concrete spraying machine is widely used in the initial support, secondary lining, reinforcement engineering and slope protection of tunnels, mines and underground projects. In tunnel construction, it is mainly used to provide initial support for the tunnel wall to prevent collapse and provide a stable working surface for subsequent support construction.

　　As an indispensable equipment in tunnel construction, concrete spraying machine greatly improves construction efficiency and safety, while ensuring the quality of concrete spraying.

　　With the continuous advancement of technology, the fields of modern mining and tunnel engineering have undergone revolutionary changes, and the widespread application of rock drilling rigs is a microcosm of this change. The rock drilling rig, with its outstanding performance advantages, is reshaping the construction standards of the industry and becoming a key technology for improving construction safety, efficiency, quality, and cost control.

　　1. Significant improvement in construction safety performance

　　In traditional manual rock drilling operations, operators often need to directly face the risk of rock falling, and safety issues have always been a major challenge in the industry. The emergence of rock drilling rigs completely changed this situation. It has designed a dedicated anti rockfall cab to ensure that operators work in a safe environment, away from potential hazards in the palm face, greatly reducing safety risks during the construction process and providing a safer working environment for workers.

　　2. Efficient construction, accelerating project progress

　　The rock drilling rig not only improves the safety of construction, but its construction efficiency is also remarkable. Compared to traditional manual drilling, the drilling speed of rock drilling rigs is faster, which can significantly shorten the construction period and effectively accelerate the project progress. This not only saves time costs, but also provides the possibility for the project to be completed ahead of schedule, thereby bringing more economic benefits to the owners.

　　3. Effective control of labor costs

　　In today's increasingly high labor costs, the advantages of automated operation of rock drilling rigs are becoming more and more apparent. It reduces reliance on manual labor, effectively lowers labor costs, and further shortens the construction period by improving construction efficiency, achieving dual cost control. This is of great significance for improving the overall economic benefits of the project.

　　4. A leap in construction quality

　　The introduction of rock drilling rigs has also brought significant improvements in construction quality. Its precise drilling capability ensures that the drill rod advances according to the preset horizontal or fixed inclination angle. Compared with manual control, it greatly improves the accuracy of drilling, reduces overexcavation, and makes excavation more precise. It not only improves engineering quality but also reduces material waste, achieving a win-win situation of economic and environmental benefits.

　　Rock drilling rigs, with their outstanding performance in construction safety, efficiency, cost control, and quality improvement, are becoming the preferred equipment in modern mining and tunnel engineering fields, leading the industry towards more efficient, safer, and more economical development.

　　There are significant differences in design, performance, application environment, and operational efficiency among different types of rock drilling rigs, which are mainly reflected in the following points:

　　1. Homework environment:

　　-Open pit rock drilling rig: Designed to adapt to open spaces, usually with a large volume, strong stability and power, suitable for open environments such as open-pit mines and large construction sites.

　　-Underground rock drilling rig: compact structure, emphasizing safety and flexibility, suitable for operation in narrow and limited ventilation conditions of mines, equipped with specialized ventilation and lighting systems to ensure the safety of underground operations.

　　2. Walking mechanism:

　　-Tire type rock drilling rig: With fast movement speed and flexible steering, it is suitable for working environments with flat and hard terrain, such as highway construction and open-pit mines.

　　-Crawler rock drilling rig: With stronger grip and passing ability, it is suitable for stable operation on soft ground, steep slopes, or rugged terrain, such as forests and swamps.

　　3. Quantity of rock drills installed:

　　-Single arm rock drilling rig: usually has a simple structure and flexible operation, suitable for working environments that require high-precision drilling or limited space, such as tunnel construction.

　　-Two arm and multi arm rock drilling rigs: equipped with multiple rock drills, capable of drilling multiple points simultaneously, greatly improving operational efficiency, suitable for large-scale mining, large-scale tunnel excavation and other engineering projects that require rapid advancement.

　　4. Power system and energy type:

　　-Different types of rock drilling rigs may also have different power systems, such as diesel engines, electric motors, etc. Electric rigs are more common in underground operations because they reduce harmful gas emissions and are more environmentally friendly and safe.

　　5. Level of automation and intelligence:

　　-Modern rock drilling rigs are increasingly adopting automation control and intelligent technologies, such as GPS positioning, remote monitoring, automatic drilling, etc. The application of these technologies significantly improves operational accuracy and efficiency, while also reducing the labor intensity and risks of manual operations.

　　Different types of rock drilling rigs have their own focuses, and choosing the appropriate model of rock drilling rig is crucial for improving operational efficiency, ensuring operational safety, and reducing operating costs. In practical applications, comprehensive consideration should be given to the specific working environment, project scale, and requirements to achieve the best construction effect.

　　In the initial stage of tunnel construction, the choice of support technology is directly related to the safety, environmental protection and economy of the project. In recent years, with the continuous advancement of tunnel construction technology, concrete wet spraying machine has been used more and more widely in the initial support of tunnels. Its high safety, high environmental protection, high efficiency and low cost characteristics are gradually becoming the preferred solution for the initial support of tunnel construction.

　　Safety: Building a lifeline

　　Concrete wet spraying machine adopts wet spraying process. Compared with the traditional dry spraying process, it can effectively reduce the dust concentration during the construction process and reduce the health hazards to construction workers. At the same time, wet spraying concrete has better adhesion and strength, can quickly form a stable support structure, and provide a safer working environment for tunnel construction workers.

　　Environmental protection: practice of green construction

　　During the construction process, the wet spraying concrete process greatly reduces the impact on the surrounding environment due to its low dust emission and low noise characteristics, which is in line with the concept of green construction in modern tunnel construction. In addition, the wet spraying process can effectively control the amount of concrete used and reduce material waste, further reflecting the practice of environmentally friendly construction.

　　High efficiency: accelerating the progress of the project

　　The wet spraying machine has a high degree of automation, can achieve continuous operation, and significantly improves the construction efficiency. The concrete of the wet spraying process is evenly mixed and has a fast spraying speed. It can complete a large area of ??support work in a short time, greatly shortening the tunnel construction cycle, and plays an important role in accelerating the progress of the project.

　　Low cost: significant economic benefits

　　The wet spraying concrete process also performs well in reducing construction costs. Due to its fast construction speed and high material utilization rate, it can effectively control costs. At the same time, the wet spraying process reduces dependence on labor, reduces labor costs, and improves the economic benefits of the entire tunnel project.

　　In summary, the application of wet spraying machines in the initial support of tunnels not only improves the safety and environmental protection of construction, but also significantly improves construction efficiency and reduces costs. It is a technological innovation in the field of tunnel construction. In the future, with the continuous advancement of technology, the role of wet spraying machines in the initial support of tunnels will become more prominent, providing a stronger guarantee for the safe, efficient and green construction of tunnel projects.

　　In modern construction and civil engineering, shotcrete technology is widely used because of its high efficiency, flexibility and strong adaptability. This article will introduce the construction process of shotcrete operation in detail, aiming to provide construction personnel with a clear operating guide to ensure construction quality and safety.

　　I. Construction preparation

　　Construction preparation is the first and key step in shotcrete operation. This includes the assessment of the site environment, the inspection of equipment and the training of personnel. The construction team needs to conduct a detailed survey of the operation area, understand the geological conditions, and formulate a reasonable construction plan. At the same time, ensure that all construction equipment is in good condition and that construction personnel are familiar with the operating procedures and safety regulations.

　　II. Treatment of the sprayed surface

　　The treatment of the sprayed surface is an important link in improving the bonding strength and construction quality of shotcrete. First of all, loose materials, oil stains and accumulated water on the sprayed surface should be removed to ensure that the sprayed surface is clean and dry. If necessary, the sprayed surface should be roughened to increase the contact area between the sprayed concrete and the sprayed surface and improve the bonding effect.

　　III. Bury the marking nails of the sprayed layer thickness

　　In order to control the thickness of the sprayed concrete, marking nails should be buried on the sprayed surface before construction as a reference for the spraying thickness. The marking nails should be evenly distributed, and the spacing should be adjusted according to the construction requirements to ensure that the thickness of the sprayed concrete is uniform and meets the design requirements.

　　IV. Machinery is in place

　　Construction machinery, including sprayers, concrete mixers, transportation equipment, etc., should be in place in advance and debugged to ensure normal operation during the construction process. In addition, it is necessary to check the connection of wind, water and electricity to ensure that the operation will not be interrupted due to equipment failure during the construction process.

　　V. Connecting ventilation, water and electricity and testing the machine

　　Connecting ventilation, water and electricity is a necessary step before construction to ensure the power supply during the construction process. After connecting ventilation, water and electricity, all equipment should be tested, the operating status of the equipment should be checked, and faults should be eliminated in time to avoid unexpected shutdowns during the construction process.

　　VI. Initial spraying operation

　　The initial spraying operation is the first stage of spraying concrete construction, which is mainly used to form the foundation layer. During the initial spraying, the spraying angle and distance should be controlled to ensure that the concrete evenly covers the sprayed surface and forms a stable base layer. After the initial spraying operation is completed, the initial setting of the shotcrete needs to be checked to ensure that the concrete can quickly form strength and lay the foundation for subsequent operations.

　　VII. Re-spraying concrete operation

　　The re-spraying operation is carried out after the initial spraying layer reaches a certain strength, mainly used to increase the thickness of the shotcrete to meet the design requirements. During the re-spraying operation, the spraying parameters should be adjusted according to the construction progress and the solidification of the shotcrete to ensure the continuity and uniformity of the shotcrete.

　　VIII. Quality inspection

　　After the construction is completed, a quality inspection should be carried out immediately, including the thickness, strength, and appearance quality of the shotcrete. Quality inspection is a key link to ensure the quality of shotcrete construction. Any parts that do not meet the design requirements should be repaired in time to ensure the quality of the entire project.

　　Through the above steps, we can see the refinement and standardization of the construction process of shotcrete operations, which not only improves the construction efficiency, but also ensures the construction quality. The construction team should strictly abide by the construction process, pay attention to every detail, and ensure the safety and efficiency of the shotcrete operation.

　　In the construction process of tunnels and underground projects, initial support is a key link to ensure the safety and stable progress of the project. It not only provides safety for subsequent construction, but also directly affects the quality and progress of the entire project. This article will discuss in detail the general process flow of initial support construction and the importance of each step.

　　I. Initial spraying of concrete after excavation

　　After the excavation of the tunnel is completed, the first step is to carry out the initial spraying of concrete. This link aims to quickly close the rock surface, prevent the loosening of the surrounding rock and soil erosion, and provide a stable working surface for subsequent support work. Initial spraying of concrete usually adopts wet spraying to ensure the density and strength of the concrete, thereby effectively resisting the initial stress release of the surrounding rock.

　　II. System support construction

　　System support construction is the core link of initial support, mainly including the installation of anchor rods, steel mesh and steel frame. This process ensures the safety of the tunnel in the subsequent construction process by enhancing the stability of the surrounding rock.

　　1. Anchor construction: Anchors penetrate deep into the rock layer to tightly combine the surrounding rock with the support structure, thereby improving the self-stabilizing ability of the rock mass. The arrangement of anchors should be carried out according to geological conditions and design requirements to ensure that they can effectively resist the deformation of the surrounding rock.

　　2. Laying of steel mesh: The laying of steel mesh can enhance the crack resistance of shotcrete and improve the integrity of the support structure. Combined with anchors and steel frames, the steel mesh can form a complete support system to effectively control the displacement of the surrounding rock.

　　3. Steel frame installation: As the skeleton of the support structure, the steel frame can provide rigidity and support. Especially in areas with complex geological conditions and poor surrounding rock stability, the installation of the steel frame is particularly important.

　　III. Re-spraying concrete to the designed thickness

　　After completing the system support construction, re-spraying concrete is required to achieve the support thickness required by the design. This link can not only further enhance the strength of the support structure, but also ensure the integrity and waterproof performance of the support structure, providing guarantee for the long-term stable operation of the tunnel.

　　Key points:

　　Ensure that the concrete is sprayed evenly to avoid weak points.

　　The thickness of the re-sprayed concrete should be strictly controlled according to the design specifications to ensure the long-term stability of the tunnel.

　　The initial support construction is a key step in the tunnel project. It builds the "first line of defense" for tunnel safety through a series of processes such as initial spraying of concrete after excavation, system support construction (including the installation of anchor rods, steel mesh, and steel frames), and re-spraying of concrete to the designed thickness. Each link needs to be carefully designed and constructed to ensure the safety and quality of the entire project. Through scientific and reasonable initial support construction, the deformation of the surrounding rock can be effectively controlled, creating favorable conditions for subsequent construction and ensuring the smooth progress of the tunnel project.