Highway leveling, highway leveling grade requirements

Theoretically speaking, it should be done according to the technical specifications for subgrade construction. However, if you can find an elevation datum point over a short distance, I think you should be more flexible in segmentation. For example, there is an elevation datum point on 0+000, and there is also a datum point near 0+980, so that the adjustment can be carried out on this segment with higher accuracy.

Of course, this is troublesome, since it is the target, I think the accuracy requirements are not high, so be flexible. More than 30 kilometers, it is better to divide it into five sections, so that the sub-accuracy can be, and the height difference closure difference will not be too big, the distance is too long, and the height difference closure difference is too large is not in line with the specification of the ,,, reference. If there is a new regulation, please post, thank you.

Highways are usually measured using national fourth-class leveling points.

Leveling, also known as "geometric leveling", is a method of measuring the height difference between two points on the ground with a level and a leveling ruler. A level is placed between two points on the ground, and the level scale erected on the two points is observed, and the height difference between the two points is calculated according to the readings on the ruler. The elevation of each point is determined station by station, usually from the origin of the level or any known elevation point, along the selected leveling route.

Since the water level of different elevations is not parallel, and the elevation difference between the two points measured along different routes will be different, it is necessary to make necessary corrections according to the normal elevation system used in order to obtain the correct elevation when collating the results of national level measurements.

You should first determine your starting point, which is to select a known point.

According to the requirements of the specification, it is divided into two sections respectively.

Summary. Hello, the highway meets the requirements with a fourth-class level measurement accuracy. According to the Highway Survey Specification:

The 1985 national elevation datum should be used for the highway elevation system, and the same elevation system should be used for the same highway project, and it should be connected with the elevation system of adjacent projects. The level measurement should be used for the elevation control of each grade, and its grades are second, third, fourth and fifth (also called extraordinary). Among them, viaducts, highways, and first-class highways should be measured at the fourth level.

Hello, the highway chain virtual use of the fourth-class level measurement accuracy to meet the requirements. According to the regulations of the Public Loft Road Survey Specification, the 1985 National Elevation Datum should be used for the highway elevation system, and the same elevation system should be used for the same highway project, and it should be connected with the elevation system of the adjacent project.

The level measurement should be used for the elevation control of each grade, and its grades are second, third, fourth and fifth (also called extraordinary). Among them, viaducts, highways, and first-class highways should be measured at the fourth level.

Can you elaborate on that a little bit more?

Hello Liang Blind Wei, the leveling of the highway is a fourth-class level measurement, the fourth-class leveling is to use a three-meter black and red double-sided ruler, the purpose of the black and red double-sided ruler is to avoid human errors,,, black surface in the wire reading + constant = red surface in the wire reading, it proves that the reading is correct. Measurement method: Instrument leveling, aiming at the rear view, reading the black surface reading, recording the reading of the upper and lower wires, recording the front sight, reading the black reading, recording the reading of the upper and lower wires, recording the reading of the red surface, recording the aiming of the rear view, reading the red reading, recording this is the order of the back, front, front and back, and measuring the readings at each station.

Hello, it is a pleasure to serve you and give you the following answers:1Highway leveling grade requirements:

General requirements: The highway leveling grade requires the control front to be completed at 15mm, the section to be controlled at 25mm, the curve to be controlled at 15mm, and the station to be controlled at 50mm. Special Requirements:

In highway bridges, tunnels and important nodes, the leveling level is required to be controlled at 10mm, the section is controlled at 20mm, the curve is controlled at 10mm, and the station is controlled at the causes and solutions of the problem: Reason: The accuracy of the highway leveling is determined by factors such as equipment quality, management process, and adjustment method.

Solution: (1) Strengthen equipment management: regularly check the accuracy of the equipment and replace the damaged parts to ensure the accuracy of the equipment.

2) Improve management process: Establish a strict management process to improve work efficiency and reduce error rate. (3) Optimal adjustment method:

Efficient adjustment methods are used to ensure measurement accuracy. 3.Steps:

Device management: check the accuracy of the equipment, replace damaged parts, etc. Management Process:

Establish a strict management process to improve work efficiency and reduce error rate. Adjustment method: Adopt effective adjustment method to ensure measurement accuracy.

In general, the higher the leveling accuracy, the better the quality of the overall project. In addition, the mercury celery quasi-measurement can also help us detect the location of bridges and tunnels.

Hello, I am glad to serve you and give you the following answers: highway leveling grade requirements refer to the accuracy requirements of leveling when building highways. In general, the highway leveling grade is required to be 1:

1000, that is, the level error per meter is not more than 1 mm. The methods and practice steps to solve the requirements of highway leveling grade are as follows:1

Firstly, it is necessary to determine the reference point of the leveling ridge and determine the starting point and the end point of the leveling. 2.Then, use a level to measure and record the results; 3.According to the measurement results, the level error should be calculated and compared with the grade requirements; 4.

Finally, if the leveling error exceeds the level requirements, the leveling is re-measured until the level requirements are met. Personal tip: When conducting highway leveling, make sure the accuracy of the measuring instruments, and ensure the accuracy of the measurement results to ensure that the grade requirements are met.

Answer]: B Highway elevation measurement should be measured by level rapid book measurement or triangular elevation measurement. There should be a leveling point every 500m along the route, and a leveling point should be encrypted for high-speed grinding highways and first-class highways, with a leveling point every 200m.

After the leveling point is buried, the relationship between the leveling point and the nearby fixed buildings or other features should be drawn, and the number and elevation of the leveling point should be written on the map, which is called the point of record, so as to facilitate the use of finding the location of the leveling point in the future. The word BM is usually added before the leveling point number as the code of the leveling point.

The main forms of leveling routes are: closed leveling routes, attached leveling routes and branch leveling routes.

When the elevation point of ** is far away from the leveling point or the height difference is large, it is necessary to place the instrument several times in a row to measure the height difference between the two points. In order to measure the height difference between points A and B, add 、... on the AB lineand so on.

The AB height difference is divided into several leveling stations. The intermediate point only serves the role of transferring elevation, which is called a turning point, abbreviated as TP or ZD. There is no fixed marker for the transfer point, and there is no need to calculate the elevation.

Obviously, each time the instrument is placed, a height difference can be measured.

It is calculated by the formula building elevation = structural elevation + decorative layer thickness.

The elevation of the building is the elevation of the living surface of the building, and after the completion of the structure, the elevation after the surface treatment of the ground is carried out, so the height of the ground treatment is also specified in advance.

The elevation represents the height of each part of the building, the vertical height of a part of the building relative to the datum (the zero point of the elevation), and the basis for vertical positioning. Building elevation = structural elevation + thickness of decorative layer, the building elevation of the drawing design is not the same as the structural elevation, the elevation of the bright building is calculated from the top surface of the floor decoration, and the structural elevation is calculated from the top of the structural plate.