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1. Why do we say that under normal circumstances, the self weight stress of soil will not cause the compression deformation (or settlement) of soil, and when the groundwater level drops, it will make the soil yield increase
The compression deformation is caused by stress. The decrease of water level indicates that the stress of soil has changed. Part of the original action of water is transferred to the soil, which causes the increase of soil stress, so the settlement occurs
Calculation method of elevator counterweight stroke
How to correctly determine the maximum allowable counterweight buffer distance
Since the implementation of traction and forced drive elevator TSG t7001-2009 on April 1, 2010, the determination of counterweight buffer distance is quite different from the 02 edition of inspection regulation,
In other words, from the implementation of the new inspection regulation itself, on the premise of meeting the requirements of the space at the top of the hoistway and the action of the limit switch before contacting the buffer, the counterweight buffer distance no longer needs to distinguish the energy storage type and the energy consumption type, and is not limited by 150 mm ~ 400 mm (energy consumption type) and 200 mm ~ 350 mm (energy storage type). As long as the top height is enough, the counterweight buffer distance can be large enough, If the height of the top layer is not enough but the limit switch can act before touching the buffer, the counterweight buffer distance can also be less than 150 mm
The first step is to measure the following distance values when the elevator is at the leveling position of the upper end station:
1. The distance between the upper end of the guide shoe and the top of the guide rail is smaller than a
2. The free vertical distance b between the horizontal plane of the highest standing area of the car roof (the upper beam is generally considered as non standing) and the horizontal plane of the lowest part of the shaft top in the car projection part (including the beam and the parts fixed under the shaft top)
3. The free vertical distance C between the lowest part on the top of the shaft and the highest part in the car guardrail (the distance between the guardrail and the outer edge of the car shall not be greater than 0.15m);
4. The free vertical distance d between the lowest part of the top of the shaft and the highest part of the guide shoe or roller or guardrail;
The second step is to determine the compression stroke y of counterweight buffer
1. Measure the distance w between the landing door sill and the car door sill when the counterweight is completely pressed on the buffer;
2. Measure the counterweight buffer distance x;
3. Use the following formula to calculate the compression stroke y of counterweight buffer
Y=W-X
The third step is to calculate the possible counterweight buffer distance s according to the following formula
S1=A-Y-（0.1+0.035v2）
S2=B-Y-（1.0+0.035v2）
S3=C-Y-（0.3+0.035v2）
S4=A-Y-（0.1+0.035v2）
The fourth step is to determine the maximum allowable buffer distance
The minimum value of S1, S2, S3 and S4 is the maximum allowable counterweight buffer distance
The fifth step is to mark the striking and permanent mark of the maximum allowable counterweight buffer distance near the counterweight buffer
From the point of view of safety, it is necessary to consider the buffer action in the light of small contact distance
0.035v2 means the second power of 0.035 × v. V is the rated speed of the elevator
I hope I can help you! Thank you!
What is equivalent stress? What is the meaning of SEQV in ANSYS analysis? What is the calculation formula of equivalent stress?
）What is the difference between the equivalent stress and the maximum stress S1 in ANSYS? When we discuss the stress distribution, should we use the equivalent stress or the maximum stress S1? 2) do we need to input the equivalent Poisson's ratio when we calculate the equivalent stress? 3) in practical applications, for example, when we discuss the stress distribution of stress concentration in a circular hole on a flat plate, we should use
There are 105 people on the two cars. If there are 5 more people on Jinlong and 4 less people on Daewoo, the number of people on the two cars will be the same. How many people are there on the two cars?
[105 - (5 + 4)] 2, = (105-9) △ 2, = 96 △ 2, = 48 (people), 48 + (5 + 4) = 57 (people); answer: there were 48 people on Jinlong bus and 57 people on Daewoo bus
Help me to do some fourth grade problems!
1. There are two different natural numbers. Their product is 56 and their sum is 18. What is the difference between the two numbers?
2. Yuanyuan's bedroom is 5 meters long and 4 meters wide. When decorating, a 15 cm wide decorative strip should be pasted around the floor. What is the area of the decorative strip?
3. There are 12 students or 16 students in each line in a class. The students in this class are between 30 and 50. Can you calculate the number of students in this class?
4. The distance between a and B is 650 kilometers, and now there are two cars running at the same time. The express car runs 70 kilometers per hour, and the local car runs 60 kilometers per hour. How many hours will it take for the two cars to meet?
5. Uncle Li's family has a rectangular paddy field 56 meters long and 30 meters wide. Because it is close to the roadside and the road needs to be expanded, the width of the paddy field should be shortened by 2 meters. If the area of the paddy field is to remain unchanged, how many meters should the government extend this paddy field?
6. A and B practice running. A runs 7 meters per second, B runs 5 meters per second. Now B runs 10 seconds first, and a few seconds later a catches up with B?
7. If △ * □ = 216, what is the product of (△ * 20) * (□ * 5)?
Remember it's the fourth grade problem!
Remember it's the fourth grade problem!
Remember it's the fourth grade problem!
Remember it's the fourth grade problem!
1. There are two different natural numbers, their product is 56, and 18, what is the difference between the two numbers? 14-4 = 102 yuan bedroom is 5 meters long and 4 meters wide. When decorating, 15 cm wide decorative strips should be pasted around the floor. What is the area of the decorative strips? (500 + 400) × 2 × 15 = 27000 (...)
Ten practical questions in Grade Four
1. Zhang Dabo's family has 940 kg of rice in a bag of 50 kg. At least how many bags are needed to hold the rice?
2. To build a 960 meter long canal, the original plan was to complete the task in 24 days. In fact, 48 meters were built every day. How many days ahead of schedule could the task be completed?
3. Students line up to do exercises. If there are 24 people in each line, they need to stand 36 lines. If there are 32 people in each line, how many lines do they need to stand?
4. A suit of clothes, coat 54 yuan, trousers 38 yuan. ① 8 sets of such clothes to how much? ② 690 yuan can buy up to several sets of such clothes?
5. A bottle of oil, 700 grams in a bottle. After eating half of the oil, the bottle still weighs 450 grams. How many grams does the oil weigh? How many grams does the bottle weigh?
6. The first engineering team builds 128 meters of roads every day, the second engineering team 236 meters, the third engineering team 136 meters and the Fourth Engineering Team 264 meters?
7. The school has built a new teaching building with 4 floors, 5 classrooms on each floor, and 12 fluorescent lamps are installed in each classroom. How many fluorescent lamps are installed in this teaching building?
8. 15 frogs can eat 480 mosquitoes in an hour. According to this calculation, how many frogs can eat in an hour for 250 frogs? If 50 mosquitoes weigh 1g, how many grams do these mosquitoes weigh?
9. The first and second grades of Chunmiao primary school organize children to travel together. There are 48 people in the first grade and 44 in the second grade. It is known that there are 17 people in each van and 35 people in each bus. Please help them design a car rental scheme
10. At the gate of the park, Xiao Li pays 4 yuan an hour for parking his car and 2 yuan an hour later; Xiao Zhang pays 5 yuan an hour for parking his van and 3 yuan an hour later?
Help, (I'm not a little BB)
Problems! (+ &; +), calculation problems, speed calculation, ladder equation, equation (@ - @)
It only takes 40 minutes; according to this calculation, if he goes back and forth on foot, how long does it take? It takes 20 minutes to go to work by car, and it takes 70 minutes to go home from work by car. If he goes back and forth on foot, it takes 140 minutes
9+99+999+9999+99999=?
89999999+8999998+899997+89996+8995+894=?
Please use a simple algorithm,
(1+11+111+1111+11111)x9=111105
(90000000+9000000+900000+90000+9000+900)-(1+2+3+4+5+6)=999879
The fruit supermarket bought 85 kilograms of litchi the next day, 20 kilograms more than apples. How many kilograms of fruit did it sell the next day?
(85-20) + 85 = 150 (kg)
A: sold 150 kg of fruit the next day
Koizumi spent 23 yuan and 50 cents to buy a pen, which is 8.3 cents more than buying a copybook. How much did he spend altogether? (calculated by decimal)
23 yuan and 50 Jiao = 23.5 yuan, 8 Jiao and 3 fen = 0.83 yuan, 23.5-0.83 + 23.5, = 22.67 + 23.5, = 46.17 yuan. A: he spent 46.17 yuan altogether
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