A trackless measurement construction method for the inner ring network of a subway tunnel
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A construction method and technology in the tunnel, applied in the directions of measuring device, height/horizontal measurement, surveying and navigation, etc., can solve the problems such as tight construction period of subway power supply
Active Publication Date: 2021-07-06
CHINA RAILWAY 12TH BUREAU GRP +1
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The construction period of the subway power supply is generally relatively tight. Under normal circumstances, the survey construction based on the laid and adjusted steel rails or connecting passages in the tunnel often cannot meet the requirements of the construction period.
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Embodiment 1
[0046] This embodiment provides a trackless measurement construction method for a ring network in a subway tunnel, which includes the following steps.
[0047] Step 1. Determine the starting mileage and calculate the coordinates of the starting point
[0048] Take the preset distance N1 inward of the tunnel entrance as the starting point, and the mileage obtained by adding the preset distance N1 to the tunnel entrance mileage is the starting measurement mileage.
[0049] When measuring the ring network of the tunnel, considering the convenience of construction, generally select the position 5 meters inward of the opening (that is, N1=5 meters) to start the measurement, and add 5 meters to the mileage of the tunnel opening to get the starting mileage. Combined with the horizontal and vertical section diagram of the line, the starting point of the tunnel entrance is the structural boundary point, and the coordinates of the structural boundary point, as well as the coordinates of...
Embodiment 2
[0080] In the power supply system and comprehensive monitoring system equipment installation project of the first phase of the Beijing Rail Transit New Airport Line, a trackless measurement construction method for the inner ring network of the subway tunnel described in Example 1 was adopted, taking into account both measurement accuracy and efficiency. After practice , achieved good results.
[0081] In terms of economic benefits: first, when there is less cross-interference, the construction efficiency is greatly improved, and the construction efficiency is greatly improved, and the same number of people can complete more projects, which saves construction costs; Coordination expenses, and possible layoff costs.
[0082] Compared with the previous survey construction, after the design rail surface position and slope distance are given, it becomes very simple to determine the installation height of the ring network support. A group of three can quickly and accurately complete...
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Abstract
The invention provides a trackless measurement construction method for the inner ring network of a subway tunnel, belonging to the technical field of subway construction, comprising step 1, determining the starting measurement mileage and calculating the coordinates of the starting measurement point, and step 2, calculating the starting measurement point and every preset distance The design rail surface elevation of the corresponding point of N2, step 3, the positioning mark of the design rail surface elevation position of the starting point, step 4, the starting point is the starting point, and the design rail surface elevation measurement mark of the corresponding point every preset distance N2 , step five, the total station measures the slope distance in the shield tunnel, and takes the average value, step six, determines the installation height position of the ring network support, and step seven, checks and checks during the measurement process. Adopting the trackless measurement construction method of the inner ring network of the subway tunnel, the entry time is greatly advanced, and the height measurement construction of the bracket installation can be carried out before the track laying construction, which reduces the pressure of the construction period for the subsequent process, reduces the interference of cross construction, and improves the construction efficiency. .
Description
technical field [0001] The invention belongs to the technical field of subway construction, and specifically discloses a trackless measurement construction method for an inner ring network of a subway tunnel. Background technique [0002] In the subway power supply construction, the ring network is the basis for the normal operation of the subway and occupies a very important position in the power supply network. As the installation of the ring network support is an important process of the ring network professional, the measurement of the installation height of the support is the premise of the support installation and the key to the precision control. The outer support of the tunnel is generally installed on the column of the evacuation platform, and there are reserved holes, which do not involve the measurement of the installation height. The construction period of the subway power supply is generally relatively tight. Under normal circumstances, the survey construction ...
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