Although there is no wind or rain in the underwater construction, from time to time, there will be a "blocking tiger" that feeds on the cutter on the cutter head. What is the degree of damage to the Tool? When do I need to change the tool? The shield system of the front compartment of the shield machine developed by CCCC Engineering Co., Ltd. makes the "black box" of the earth pressure capsule become transparent, and this technology The successful application of the Weisan Road crossing the river channel also filled the domestic gap. “The key to shield construction is the cutterhead, and the wear of the cutter is one of the most difficult problems encountered during construction.†According to the construction of the Weisan Road Tunnel, the shield tunnel is complex through the stratum and needs to be built during the tunneling. A soft upper and lower hard composite stratum formed by a combination of soft, hard strata and various layers such as clay layer, sand layer, gravel, pebble layer and strong middle weathered siltstone layer, totaling 3,537 meters. Among them, there are 490 meters through the rock formation, and the damage to the cutter is extremely serious. Open the cabin, this is the most direct and most reliable way to inspect the tool. After the stop, it will be inspected by manual entry. However, at the bottom of the river with high water pressure, there is a high risk in this way, which may cause the collapse of the excavation surface, which in turn affects the safety of the buildings around the tunnel. At the same time, the cost is high, and each inspection takes more than 7 days, which will undoubtedly affect the construction progress of the Weisan Road crossing channel project. Stretching a camera into the cutter head, everything in it is not clear at a glance. It seems easy, but the technical difficulty is very big. The use of visual monitoring systems in specialized fields must first overcome various technical problems in specific use environments, such as drilling TVs, whose sealing structure can withstand water pressures of hundreds of meters or even thousands of meters, and cameras used for seabed detection must With pressure and corrosion resistance. At the same time, the front-view and side-view angles should be recorded and analyzed without disturbing the borehole wall, and have the ability of panoramic observation and real-time monitoring. After repeated research and development by the China Communications Tunnel Bureau, one by one problem, the shield system front cabin visual system technology was born, filling the domestic gap in this field. The visual tool cutter monitoring system is divided into two functional areas: rear view system and front view system. The former has the ability to take pictures of the tool from the back of the cutter head and perform image analysis processing. The image is analyzed and processed by specially developed image processing software, and compared with the original photo of the tool to determine the wear of the tool, so that it needs to be replaced. The tool is processed in time; the latter has the ability to take pictures from the front and side of the cutter head, and intuitively judges the wear of the hob according to the camera picture. “The system can visually see the wear condition of the tool in the first time. The sensor is also mounted on the cutter head. After the 51 hobs fixed on the cutter head wear out, the sensor will feedback the information and hide it in the cutter head. The hob will be pushed out by itself, and after the wear, there will be 18 spare hobs that can be replaced. If the three batches of hobs are damaged, the staff can press the cabin to change the knife." The person in charge said that by developing a shield tool visual monitoring system, it is possible to accurately determine the appropriate tool change time, which is beneficial to the construction arrangement and timely shutdown maintenance and fault handling of the shield, and can also be caused by tool wear. Economic and time losses are minimized. In addition to the shield system front cabin visual system technology, it also innovatively replaces the shield tail brush with liquid nitrogen freezing. The shield tail brush is welded on the shield tail of the shield, which can prevent the soil, groundwater and filling slurry from entering the shield. It is known as the lifeline of the mud shield machine. Therefore, when the shield machine is digging at the bottom of the river, it is necessary to ensure that the shield tail brush is intact. However, in the long shield of the shield machine, the long-term wear between the tail brush and the shield machine, as well as the change of the shield posture, is likely to cause the damage of the shield tail brush. Damage to the tail brush is likely to cause water inrush and sand sloshing, which seriously affects shield tunneling. When the shield tail leakage occurs in the S line of the Weisan Road crossing channel, the liquid nitrogen freezing technology is used to freeze the loose soil of the shield machine and the surrounding loose soil into a “large ice block†to isolate the groundwater and ensure that the muddy water will not pass through the damage. The tail brush poured into the tunnel. After freezing, the removal of the segments and the replacement of the tail brushes have achieved good results. Concerned about surprises
Drum brush is divided into long hair, medium hair, short hair three kinds, its performance is the length of the drum brush hair, rather than the thickness and length of the drum itself, brush hair is usually divided into wool and chemical fiber two kinds.
Paint Roller,Foam Paint Roller,Paint Roller Brush,Roller Brush,dry paint roller quickly Behappy Crafts (suzhou)Co.,Ltd , https://www.haoyuebehappy.com
Different rollers will brush different effects, long hair rollers will brush out some fine texture, concave and convex feeling, similar to the texture effect. The paint surface after short wool roller besmear is more uniform, smooth, without concave and convex feeling, in the wool is between the two.
Roller brush is mostly made of wool and foam plastic, which can be divided into paint drum brush, hair drawing drum brush, floor paint drum brush, flat coating drum brush, etc., mainly used for large-area paint rolling in architectural decoration engineering. And can be used for coating and rolling all kinds of paint, such as: latex paint, anti-rust paint, internal and external wall paint, wallpaper glue, etc.
Note:
The use of drum brush as long as the straight brush can be wiped, if you want to daub evenly, the drum is best in the paint bucket to be fully absorbed, and then take out a few rolling on the inclined plane, press out the excess paint and then begin to brush the wall.
Low price, good quality products, to create a perfect house decoration