How many levels will the tomb begin to dig
singing: Chen Zitong
composing: Chen Zitong
composing: Tang Xiang
arranging: Liang Wenhao
ANGEL it fell to heaven in a moment, and it only came to the world in a moment. The world was threatened by evil, and then it was born and died. I was fed up with the damage of man-made disasters and natural disasters, the corruption of fraud and deception, and the lack of faith in this era But God didn't create the world to destroy me, as long as my world, the light in the darkness of my world, gave me unlimited power, you gave me faith, my world guided me to find the direction, just like the open wings flying to the eternal Heaven, baby never give it up eeeeeeeeeeeeeeeeeeeeeeeee baby never give it up I'm fed up with the damage of man-made disasters and natural disasters in this era. I'm fed up with the corruption of deception and deception in this era. I'm fed up with the lack of faith in this era. But God didn't create the world to destroy me. As long as my world, the light in the darkness of my world gives me unlimited power, it's the faith you give me. My world guides me to find the direction, just like an open wing flying to the eternal Heaven T up eeeeeeeee baby never give it up eeeeeeeee baby never give it up
a machine that uses compressed air to continuously transport concrete along the pipeline and spray it onto the construction surface. It is divided into two types: dry jet and wet jet. The former conveys dry mixture pneumatically and sprays it out after mixing with pressure water at the nozzle; The latter is delivered by pneumatic or concrete pump, and the concrete mixture is sprayed out through the nozzle< Concrete shotcreting machine is widely used in tunnel, culvert, subway, bridge, coal mine, high marsh mine, hydropower engineering, underground engineering, construction engineering and other protection projects. It is used for shotcrete construction. It is a machine used to prevent the falling of sand and soil on the inner wall of the tunnel, prevent landslides and landslides< According to the different water adding methods of concrete mixture, it can be divided into three types: dry type, wet type and semi wet type
1. Dry type
cement and aggregate in a certain proportion are evenly mixed and then blown to the nozzle by compressed air and mixed with the pressure water from the pressure water tank. This construction method is simple and fast, but the st is too large, the rebound loss of ejected material is large, and high-grade cement is needed. Most of the domestic procts are dry type
2. Wet
the concrete mixture that has been added water enters the sprayer. Therefore, the st content in the jet is low, and the rebound amount is also reced, which is an ideal jet mode. But the wet material is easy to condense in the pipeline, causing blockage and cleaning trouble, so it can not be widely used
3. Semi wet type
also known as wet type, that is, the concrete mixture is the wet material with moisture content of 5% ~ 8% (by volume). The st is reced when spraying this kind of material. Due to its low adhesiveness compared with wet material, it does not stick to the tank, so it is an improved way of dry and wet type
B. according to the structure of the shotcreting machine, it can be divided into three types: cylinder type, screw type and rotor type
1. Cylinder type
cylinder type shotcreting machine is solid and rable. But the machine body is too heavy, the opening and closing of the upper and lower bell valves need heavy manual operation, the labor intensity is high, and it is easy to cause pipe blockage, so it has been phased out< The screw jet has the advantages of simple structure, small volume, small mass and good maneuverability. But when the conveying distance is more than 30 m, it is easy to return air, and the proctivity is low and unstable, so it is only suitable for shotcreting support of small roadway
3. Rotor type
with the advantages of large proction capacity, long conveying distance, continuous and stable discharge, low feeding height, convenient operation, suitable for mechanized matching operation, and can be used for dry spraying, semi wet spraying, wet spraying and other spraying methods, it is a widely used model.
(2) C: the second characteristic code: tidal jet
(3) 5: main parameter code: unit proction capacity (m3 / h); Ymhy1
(4) I: supplementary feature code: I: straight through cavity. PC5 concrete shotcreting machine I of Shandong Zhongmei group is a straight through cavity type shotcreting machine with a proction capacity of 5M3 / h.
According to the different water adding methods of concrete mixture, it can be divided into dry, wet and semi wet
dry cement and aggregate in a certain proportion are evenly mixed and then blown to the nozzle by compressed air and mixed with the pressure water from the pressure water tank before spraying. This construction method is simple and fast, but the st is too large, the rebound loss of ejected material is large, and high-grade cement is needed. Most of the domestic procts are dry type
it is the concrete mixture added with water that enters the sprayer wet. Therefore, the st content in the jet is low, and the rebound amount is also reced, which is an ideal jet mode. But the wet material is easy to condense in the pipeline, causing blockage and cleaning trouble, so it can not be widely used
semi wet type is also called wet type, that is, the concrete mixture is wet material with moisture content of 5% ~ 8% (by volume). The st of this material is reced when spraying. Because of its low adhesiveness compared with wet material, it does not stick to the tank, so it is an improved way of dry and wet type
according to the structure type of the ejector, it can be divided into three types: cylinder type, screw type and rotor type
cylinder type, which is solid and rable. But the machine body is too heavy, the opening and closing of the upper and lower bell valves need heavy manual operation, the labor intensity is high, and it is easy to cause pipe blockage, so it has been phased out
the screw jet has the advantages of simple structure, small volume, small mass and good maneuverability. But when the conveying distance is more than 30 m, it is easy to return air, and the proctivity is low and unstable
the rotor type jet machine has the advantages of large proction capacity, long conveying distance, continuous and stable discharge, low feeding height, convenient operation, suitable for mechanized matching operation, and can be used for dry spray, semi wet spray, wet spray and other spray modes, so it is a widely used model. Eight V-shaped grooves are evenly distributed on the circumference of the circular drum. The drum rotates at a low speed, and the dry mixture in the hopper falls into the V-shaped groove through the bar screen. When the V-shaped groove full of mixture turns to the bottom, the mixture enters the blowing chamber, and is blown to the nozzle by compressed air along the conveying pipe
The main construction machines of shotcreting operation include: shotcreting machine, mixer, manipulator, three line (silo, mixing and output)
The auxiliary machine includes: feeding machine, air compressor, oil-water separator and water tank; Vibrating screen, etc Two tank concrete spraying machine (yejian-65 type, figure 12-1)the working performance of the two tank concrete spraying machine is good, which can ensure that the sprayed concrete has good homogeneity and compactness, and meet the construction requirements. But the operation is more complex and laborious, large and bulky
Fig. 12-1 double tank concrete spraying machine
Fig. 12-2 rotor type concrete spraying machine (rotor type II)
2. Rotor type concrete spraying machine (rotor type II) (Fig. 12-2)
working principle: ring operation, the rotating body rotates continuously, and the mixer moves the dry material at the same time, The concrete dry material falls into the U-shaped material cup of the rotator through the discharge port of the upper base body from the hopper ° Due to the effect of air pressure, the dry material is blown into the conveying pipe to reach the spray gun, and is sprayed on the rock surface after mixing with water. This kind of jet is easy to operate, small in size and light in weight, but the rubber joint plate is easy to wear
The screw concrete spraying machine (Fig. 12-3)has the advantages of simple structure, small volume, light weight, easy manufacturing and low cost
the disadvantage is that the spiral blade is easy to wear, which leads to unstable proctivity and requires a rubber feeding pipe with a larger diameter, which makes the operation difficult
Fig. 12-3 screw type concrete spraying machine
II. Mixer
e to the use of dry type spraying machine, the mixture is dry when spraying, which is easy to proce st ring mixing. Therefore, the turbine impeller forced concrete mixer should be used. J4-375 (original jw-375) mixer is commonly used (only 30s), with good sealing, small st and large volume. Applicable to caverns are: jw-200 type, an IV type
Thirdly, when shotcreting, there is a lot of st, a large amount of rebound, poor working conditions, high labor intensity and bad health. When encountering high and large cross-section underground projects, it is necessary to set up a temporary working platform, which is time-consuming. Therefore, it is necessary to use the manipulator for shotcreting as far as possible. Figure 12-4 shows a simple manipulator. When working, the workers adjust the hand wheel, the height of the column and the position of the trolley. The swing of the nozzle is driven by the motor and the recer through the flexible shaftthe simple manipulator is mainly operated by human, and the spraying height and distance are limited to a certain extent. The hydraulic manipulator can be used in large section, and all actions are driven by hydraulic pressure, and the maximum lifting height of the nozzle can reach 7.5m
Other machines include feeding machine, pressure fan, pressure water pump, etc., which can be selected according to the situation
Fig. 12-4 schematic diagram of simple manipulator
1 - nozzle; 2 - gyrator; 3 - flexible shaft; 4 - motor and recer; 5 - rotary lever; 6 - telescopic column; 7 - trolley; 8 - hand wheel
NTP is a time synchronization protocol based on network. Network time server and NTP network time server, NTP time server, NTP time server, NTP clock server, etc. These are just different names. The standard name should be "NTP network time server" or "NTP time server". There are many NTP time server manufacturers, among which the xbd211 proct of Beidou Time Frequency Technology Co., Ltd. is widely used in public security, telecommunication room, electric power and other instries or departments because of its high reliability, high stability, high response ability and high time synchronization accuracy
The name of the network clock server specification should be "NTP network time server" or "NTP time server". There are many NTP time server manufacturers, among which the xbd211 proct of Beidou Time Frequency Technology Co., Ltd. is widely used in public security, telecommunication room, electric power and other instries or departments because of its high reliability, high stability, high response ability and high time synchronization accuracy
Tesla has always been a special presence in car companies. With its sci-fi design and super acceleration performance, I had the honor to test drive the modelsp100dl. With the acceleration of 2.7 seconds and the output characteristics of the motor, I realized the feeling of brain over-current at the moment of deep stepping on the accelerator, which makes me remember it so much... However, when Tesla combined with the RV, What kind of sparks will be proced
To be honest, as a proct of Tesla, this set of combination is not very different from some American Trailer we have photographed before, except the electric pickup cybertruck, which is used as a tractorthis article comes from the author of car home, which does not represent the standpoint of car home