CN212692878U - Urban rail transit contact net trackless measuring equipment - Google Patents
Urban rail transit contact net trackless measuring equipment Download PDFInfo
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- CN212692878U CN212692878U CN202021313440.XU CN202021313440U CN212692878U CN 212692878 U CN212692878 U CN 212692878U CN 202021313440 U CN202021313440 U CN 202021313440U CN 212692878 U CN212692878 U CN 212692878U
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Abstract
The trackless measuring equipment structurally comprises data processing equipment and a trackless measuring operation platform, wherein scales are arranged on the upper portion of the operation platform, a DJJ-8 laser measuring instrument is arranged on the operation platform, a simple laser distance measuring instrument is arranged, two telescopic supports with scales are arranged below the trackless measuring operation platform, a digital display horizontal ruler is arranged, the supports are of a socket pipe structure, adjustable scales and rotary buttons are arranged on the socket pipe, and two wheels are arranged below the socket pipe. And the data processing equipment receives the measurement data of the DJJ-8 laser measuring instrument and the simple laser ranging instrument, calculates the horizontal movement amount of the center of the single-line circular tunnel and calculates the difference value between the center of the positioning point and the measuring point.
Description
Technical Field
The application relates to a measuring device for rigid contact net trackless construction of urban rail transit underground sections.
Background
In recent 10 years, urban rail transit construction in China has been rapidly developed. By the end of 2019, urban rail transit is opened in 40 cities in China, and the total mileage of an operation line reaches 6882 kilometers. In the end of 2020, it is expected that 88 urban rail transit lines will be opened nationwide.
Normally, the construction of a new line requires a period of 4 years to 4 years and a half from the beginning of civil engineering construction to the live operation of the contact network. And civil engineering construction and track construction are often restricted because of moving before a station or other reasons, so that the suspension installation of the contact net is required to be completed before the track is not formed in the professional process of the contact net. Therefore, great difficulty and challenge are brought to the construction of the contact network, and under the common condition, the construction of the contact network is one section of rail forming and one section of contact network construction. According to a normal overhead line system measurement construction method, in the construction of a wide-Buddha-line second-stage overhead line system, the hot-slip construction period target of the overhead line system required by an owner cannot be realized, so that a measurement device capable of simulating an derailment plane needs to be developed to realize the node construction period of rail connection, namely power connection. The measuring equipment can simulate the derailing plane before the track is not formed, and the trackless construction work of the contact net is completed.
Disclosure of Invention
To the unshaped current situation of track, directly adopt DJJ-8 contact net measuring instrument to measure this kind of traditional measuring method and can't realize the contact net construction, the utility model discloses the application aim is to provide one kind can realize the contact net before the track unshaped measuring equipment who measures the construction. The method has the advantages of high measurement precision, high speed, accuracy, convenience, construction cost saving and easiness in carrying.
The utility model relates to a trackless measuring equipment, its primary structure is for including data processing equipment and trackless measurement operation platform, operation platform upper portion has the scale, operation platform is last to be provided with DJJ-8 laser measuring apparatu one, and simple and easy laser rangefinder is one, and trackless measurement operation platform below has two scalable supports that have the scale, and digital display level bar is one, and the support is socket pipe structure, has adjustable scale and rotating button on the socket pipe, and the socket pipe below is provided with two wheels. And the data processing equipment receives the measurement data of the DJJ-8 laser measuring instrument and the simple laser ranging instrument, calculates the horizontal movement amount of the center of the single-line circular tunnel and calculates the difference value between the center of the positioning point and the measuring point. The tool can simulate the height of the rail surface after rail paving, and a laser measuring instrument is directly placed on an operation platform for measurement during use. The novel measuring tool can realize the measurement precision during trackless measurement, improves the measurement efficiency, and has the characteristics of simple structure, convenient installation and operation, low cost and less input of manpower.
Drawings
FIG. 1 is a schematic view of a tunnel measurement line of a circular curve segment of a circular tunnel in a shield method according to the present application;
FIG. 2 is a schematic diagram of the horizontal movement of the center of a single-line circular tunnel according to the present application;
FIG. 3 is a schematic diagram of lateral measurement of a high headroom curve segment according to the present application;
FIG. 4 is a schematic diagram of a trackless measuring device of the present application;
FIG. 5 is a diagram of actual effects of measurements in a construction project of the present application;
Detailed Description
The present application is further illustrated by the following examples.
The application provides a trackless measuring equipment of contact net, as shown in fig. 3, trackless measuring equipment of contact net, concrete part includes: the trackless measuring and operating platform is provided with one DJJ-8 laser measuring instrument and one simple laser distance measuring instrument, two telescopic supports with scales are arranged below the trackless measuring and operating platform, one digital display level bar is provided, the supports are of a socket pipe structure, adjustable scales and a rotary button are arranged on a socket pipe, and two wheels are arranged below the socket pipe.
The implementation steps are as follows:
and sequentially measuring and marking the positions of all the suspension points along the central line of the tunnel according to the span of the construction drawing, and rechecking the measurement result of the curve section in time and for multiple times to avoid accumulated errors. After the position of the suspension point is measured, a marker pen is used for clearly marking the corresponding position on the side wall of the tunnel according to the pull-out value direction, and the anchor section number of the positioning point, the positioning number of the suspension point and the lower anchor number are marked.
The central line of the line can be determined according to the actual measurement distance value from the line center to the tunnel wall base point mark in the base point encryption mark provided in advance by the track unit and the tunnel section detection calculation result.
And then according to the marks of longitudinal measurement, firstly, transversely placing the trackless measuring trolley vertical to the central line of the tunnel, encrypting the marks according to the CPIII base point provided by a track construction unit, and finding out the track central point according to the actually measured distance value from the track center to the tunnel wall base point mark in the tunnel section detection calculation result. Generally, the distance between the encryption standard of the base point at the section and the center of the track is 1.4 meters, and the distance between the encryption standard of the base point at the station and the center of the track is 1.5 meters, specifically based on the measured distance value from the center of the line to the base point standard of the tunnel wall in the tunnel section detection calculation result. And the center point of the trackless measuring trolley is ensured to be coincided with the center point of the track line.
On a straight line, the simple laser measuring instrument is placed on the trackless measuring trolley platform and is moved to the central line of the trolley platform to turn on a power supply. Thus, the point of the laser beam on the top of the tunnel is the point of the pantograph center projected on the tunnel wall, and the marking pen is used for marking the point in a cross shape.
On the curve, according to a line slope adjusting diagram and ultrahigh data provided by a track unit, a real track plane is simulated by utilizing the scalability of a trackless measuring trolley operating platform, and the measuring method is on the same straight line. On the curve, after the measuring trolley simulates the rail plane with the super-high height, the line center point of the rail is found out again according to the actual measurement distance value from the line center to the tunnel wall base point mark in the base point encryption mark and the tunnel section detection calculation result, and the coincidence of the center point of the trackless measuring trolley and the line center point of the rail is ensured. In the curve section, the center of the tunnel has a horizontal offset relative to the center of the line, so that the horizontal offset of the center of the line can be calculated through the following parameters, and then the measurement is carried out according to a measurement method on a straight line.
In fig. 1, d is the deviation value of the tunnel center line of the circular curve segment of the circular tunnel in the shield method relative to the line center line. The method for processing the relaxation curve segment comprises the following steps: within the range of the relaxation curve length, the tunnel center line is linearly and gradually shifted from the starting point (ZH point, offset 0) to the end point (HY point, offset d) of the transition curve relative to the line center line in a proportion of the length from the calculation point to the starting point of the relaxation curve to the length of the relaxation curve.
The single-line circular tunnel center horizontal movement amount calculation formula: d ═ ho × h/s, in which:
d- -horizontal movement (mm) h0- -distance (mm) from center of tunnel to center line of rail surface
h-track super height setting (mm) S-center distance (mm) of two inner rails, S is 1435mm when a 60kg/m steel rail is adopted, and the height from the rail surface of the track bed to the base layer is 850 mm. So d ═ (5600/2-850)/1435 × h.
Line center moving scale (mm)
| h | 120 | 110 | 92 | 68 | 44 | 30 | 26 | 10 |
| d | 163 | 149 | 125 | 92 | 59 | 40 | 35 | 14 |
And converting to determine the projection of the suspension point on the top of the tunnel and the offset of the line center according to different installation forms, line conditions and consideration of the offset towards the direction of the large pulling value, moving the laser range finder to a corresponding offset scale position, wherein the projection of the laser beam on the top of the tunnel is the center position of the suspension point. People on the measuring ladder car make an 'x' mark on the top wall of the tunnel. In order to guarantee the later-stage suspension adjustment, the adjustment allowance can be guaranteed, and when the pulling value is larger than 150mm, the center point of the suspension point needs to be shifted towards the pulling value direction when being positioned in the transverse measurement process, so that the influence of later-stage construction errors is guaranteed. The specific offset is a pull-out value of 150 mm: 20mm,175mm:60mm,200mm:100 mm.
The drilling position of the suspended screw anchor bolt is positioned by using a special measuring template, and a marking pen is used for making a cross mark with a circle outside. And reading data of the laser measuring instrument and making a record. And original data such as tunnel type, clearance height and the like are provided for suspension installation and model selection. Wherein the track surface super-elevation of the curve section refers to track super-elevation data provided by a track unit.
The technical requirements are as follows: the tunnel expansion joint, the segment joint of the shield interval, or the obvious water seepage and leakage positions are avoided during measurement and positioning. However, the maximum design offset is strictly observed to be not more than +/-500 mm, the maximum design offset of key positioning points is not more than +/-200 mm, the maximum span is not more than 10m, and the adjacent span ratio is not more than 1: 1.25.
For suspension positioning of four holes, various matched special templates need to be manufactured, and central lines are marked; during the measurement, the position of the central line of the base is marked out, and the drilling hole position is determined by die casting.
Lateral measurement of high headroom (tunnel headroom greater than 4800mm) curve segments is different from that of the general tunnel format. After the tunnel clearance is larger than 4800mm, if the laser point is still projected according to the position pulled out from the rail surface, the whole suspension column will move inwards (see the following figure), and if the laser point is mounted according to the point, the T-shaped head bolt will move to the outside of the A-shaped vertical suspension base, and the mounting cannot be carried out. The design requirement at this time is that the vertical distance from the point C to the rail surface connecting line is 4600 mm. The clearance height of a tunnel top point A is measured, then the height difference, namely the height of the rail surface is utilized to calculate the specific position of a central point B of a suspension support positioning point according to a simple pythagorean theorem.
a ═ H/L H (H-4600) ×, clearance height (mm) H, rail surface height (mm) L, standard gauge (mm)
Since the highest headroom on the line is about 5600mm, when the maximum super height is 120mm, the maximum offset on the curve is 83.6 mm.
The application has the advantages of simple structure, practical function and convenient carrying, and simultaneously, the economic utility model is favorable for large-scale application and improves the working efficiency. The installation method can achieve the aim of installing the contact net before the rigid contact net track of the underground section is not formed. The construction method provides guarantee for metro rigid contact network construction units to convert the construction period of the contact network and save labor cost.
Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible variations and modifications of the present application using the methods and technical content disclosed above without departing from the spirit and scope of the present application, and therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall fall within the scope of the present application.
Claims (1)
1. The utility model provides a trackless measuring equipment of contact net which characterized in that: the device comprises data processing equipment and a trackless measuring and operating platform, wherein scales are arranged on the upper portion of the operating platform, a DJJ-8 laser measuring instrument is arranged on the operating platform, one laser measuring instrument is arranged, two telescopic supports with scales are arranged below the trackless measuring and operating platform, a digital display level ruler is arranged, the supports are of a socket pipe structure, adjustable scales and rotary buttons are arranged on the socket pipe, and two wheels are arranged below the socket pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021313440.XU CN212692878U (en) | 2020-07-07 | 2020-07-07 | Urban rail transit contact net trackless measuring equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021313440.XU CN212692878U (en) | 2020-07-07 | 2020-07-07 | Urban rail transit contact net trackless measuring equipment |
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| CN212692878U true CN212692878U (en) | 2021-03-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116379926A (en) * | 2023-05-31 | 2023-07-04 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for contact net of circular shield tunnel and electronic equipment |
| CN116793216A (en) * | 2023-05-31 | 2023-09-22 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for circular shield curve section tunnel contact net |
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2020
- 2020-07-07 CN CN202021313440.XU patent/CN212692878U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116379926A (en) * | 2023-05-31 | 2023-07-04 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for contact net of circular shield tunnel and electronic equipment |
| CN116379926B (en) * | 2023-05-31 | 2023-08-25 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for contact net of circular shield tunnel and electronic equipment |
| CN116793216A (en) * | 2023-05-31 | 2023-09-22 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for circular shield curve section tunnel contact net |
| CN116793216B (en) * | 2023-05-31 | 2024-02-09 | 中国铁建电气化局集团第五工程有限公司 | Trackless measurement method and system for circular shield curve section tunnel contact net |
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