A method and system for erecting a catenary for a circular shield tunnel based on trackless measurement

Abstract

The application discloses a kind of based on trackless measurement's circular shield tunnel contact network erection method and system, it is related to tunnel construction surveying technical field, including according to the basic information of circular tunnel, the design section information of circular tunnel is acquired;According to the design section information of circular tunnel, the design relationship of tunnel center line of circular tunnel and the construction information design of circular tunnel track line is acquired, while the construction information of circular tunnel track line obtains the offset value between the tunnel center line of circular tunnel and track line center line;According to the design section information of circular tunnel, construction surveying contrast site is carried out, and vertical mapping is carried out using surveying contrast site.The application in embodiment is by according to the position relationship of each design point of circular tunnel track, calculates and designs the suspension center point of contact network in tunnel, is not influenced by foundation pile control network CIII data, overall applicability is strong, precision is high, and measurement speed is fast, effectively solve the technical problem in prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction measurement, and particularly relates to a method and system for erecting a contact network of a circular shield tunnel based on trackless measurement. BACKGROUND

[0002] In a traditional tram system, the contact network is composed of steel rails and cables. In order to ensure the smooth and safe operation of the tram, the contact network must be installed at the correct position and height, and the distance from the rail must also meet the specified standards. In addition, it is also necessary to measure key parameters such as the tension of the grid line, the straightness of the cable, and the levelness.

[0003] In order to effectively overcome the problems of tight construction period, large construction cross interference affecting construction efficiency, etc. in the construction of the metro contact network, trackless measurement construction is usually adopted. Compared with track construction, trackless measurement construction can greatly reduce the construction period and the interference of cross construction of various professions, so that the erection of the contact network and the laying of the track are synchronized. In this case, the application of trackless measurement technology becomes necessary. Common trackless measurement methods mainly use total station or simulated rail methods for measurement. However, using total station or simulated rail methods for measurement is easily affected by the CP III data of the foundation pile control network, resulting in complicated measurement steps and slow overall engineering construction measurement progress. SUMMARY

[0004] The present application relates to the technical field of tunnel construction measurement, and particularly relates to a method and system for erecting a contact network of a circular shield tunnel based on trackless measurement.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The present application provides a method for erecting a contact network of a shield tunnel based on trackless measurement.

[0007] According to the basic information of the circular tunnel, the design section information of the circular tunnel is obtained.

[0008] According to the design section information of the circular tunnel, the design relationship between the tunnel center line of the circular tunnel and the track line construction information of the circular tunnel is obtained, and the offset value between the tunnel center line of the circular tunnel and the track line center line is obtained.

[0009] According to the design section information of the circular tunnel, the measurement reference point is constructed, the measurement reference point is used for vertical mapping, the measurement reference point is obtained, and the measurement reference point and the measurement point are used to draw a line to obtain the reference line of the measurement reference point and the measurement reference point.

[0010] According to the distance between the reference line of the measurement control point and the tunnel center line of the circular tunnel, a pull-out value of the measurement control point is obtained;

[0011] According to the offset value between the tunnel center line of the circular tunnel and the track center line and the pull-out value of the measurement control point, the measurement control point is adjusted, and the catenary suspension center point is determined according to the adjusted measurement control point;

[0012] According to the determination of the catenary suspension center point, the pre-buried trackless erection catenary is punched.

[0013] In a feasible embodiment, the method for determining the catenary suspension center point comprises:

[0014] The construction type of the circular tunnel is determined to be single-hole single-line, and the circular tunnel construction section is at a curve section;

[0015] According to the design section information of the curve section circular tunnel, the offset value between the tunnel center line of the curve section circular tunnel and the track center line is calculated and obtained;

[0016] The measurement control position is selected in the design section information of the curve section circular tunnel, and the measurement control point is obtained by leveling mapping the measurement control position according to the circular tunnel track construction information and the tunnel center line of the curve section circular tunnel;

[0017] The measurement control point and the measurement control position are connected to obtain a first reference line, and the distance between the measurement control point and the track center line is calculated according to the track center line;

[0018] According to the offset value between the tunnel center line of the curve section circular tunnel and the track center line and the distance between the measurement control point and the track center line, the offset value of the measurement control point is calculated;

[0019] According to the offset value of the measurement control point, the setting position at the measurement control point is adjusted to obtain the catenary suspension center point of the curve section circular tunnel.

[0020] In a feasible embodiment, the method for calculating the offset value between the tunnel center line of the curve section circular tunnel and the track center line comprises:

[0021] According to the design section information of the circular tunnel, the track bed parameters and the steel rail connection parameters are obtained;

[0022] According to the track bed parameters and the steel rail connection parameters and the measurement control point, the clearance height data information between the measurement control point and the steel rail connection is obtained;

[0023] According to the design section information of the circular tunnel, the over-level super-elevation value data information of the track connection is measured and obtained;

[0024] According to the design section information of the circular tunnel, the center distance data information between two rails in the track line is measured and obtained;

[0025] According to the clearance height data information, the superelevation value data information and the center distance data information, the distance between the first reference line and the track line center line of the curved section circular tunnel is calculated and obtained.

[0026] In a feasible embodiment, the method for calculating the offset value between the tunnel center line of the curved section circular tunnel and the track line center line comprises:

[0027] Suppose that there is an offset value E between the tunnel center line of the curved section circular tunnel and the track line center line, then:

[0028] E = B * h / L (Formula 1)

[0029] In Formula 1, B is the distance (mm) between the center of the circular tunnel and the plane of the rail;

[0030] h is the superelevation value (mm) of the track;

[0031] L is the center distance (mm) between the rails.

[0032] In a feasible embodiment, the method for calculating the offset value of the measurement control point comprises:

[0033] According to the design section information of the circular tunnel, the distance between the center of the circular tunnel and the plane of the rail line is obtained;

[0034] According to the design section information of the circular tunnel, the superelevation value data information of the track line beyond the horizontal plane is measured and obtained;

[0035] According to the design section information of the circular tunnel, the center distance data information between two rails in the track line is measured and obtained;

[0036] According to the distance between the center of the circular tunnel and the plane of the rail line, the superelevation value data information and the center distance data information, the distance between the first reference line and the track line center line of the curved section circular tunnel is calculated and obtained.

[0037] In a feasible embodiment, the method for calculating the offset value of the measurement control point comprises:

[0038] Suppose that the distance between the measurement control point and the line center line is C:

[0039] C = H * h / L (Formula 2)

[0040] In Formula 2, H is the clearance height (mm) between the measurement control point and the rail line.

[0041] h - the value of the track superelevation (mm) ;

[0042] L - the distance between the centers of the tracks (mm) ;

[0043] Then, according to formula 1 and formula 2, the offset value of the control point is Y:

[0044] Y = C - E (formula 3).

[0045] In a feasible embodiment, the tunnel center of the curved section circular tunnel is on the pantograph center line.

[0046] In a feasible embodiment,

[0047] The construction type of the circular tunnel is determined to be single-hole single-line, and the circular tunnel construction section is at the straight section.

[0048] The design section information of the straight section circular tunnel is obtained, and according to the design feature that the vertical tunnel center line of the straight section circular tunnel coincides with the vertical center line of the construction track, the measurement control position is selected in the design section information of the straight section circular tunnel.

[0049] According to the circular tunnel track construction information and the horizontal center line of the straight section circular tunnel, the measurement control position is leveled and mapped to obtain the measurement control point.

[0050] The measurement control point and the measurement control position are connected to obtain a second reference line.

[0051] According to the horizontal pull-out value between the second reference line and the center line of the straight section circular tunnel, the position of the measurement control point is adjusted to obtain the catenary suspension center point of the straight section circular tunnel.

[0052] The second aspect of the present application provides a circular shield tunnel catenary erection system based on trackless measurement, which adopts the catenary erection method based on trackless measurement of any one of the first aspect, and the measurement system further comprises:

[0053] The laser measurement device is used to set up the measurement control position to map the measurement point.

[0054] In a feasible embodiment, the measurement system further comprises:

[0055] The laser measurement device adopts a catenary laser measurement instrument when trackless measurement is performed.

[0056] The beneficial effects of the present application are:

[0057] The application designs the suspension center point of the catenary in the tunnel by calculating the position relationship of each design point of the circular tunnel track, is not affected by the CP III data of the foundation pile control network, has high overall applicability, high precision and fast measurement speed, and effectively solves the technical problems in the prior art. It has great popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 A whole structure schematic diagram (curve section circular tunnel section) of a circular shield tunnel catenary erection method based on trackless measurement provided in the embodiments of the application;

[0059] Figure 2 A whole structure schematic diagram (curve section adopts a catenary laser measuring instrument) of a circular shield tunnel catenary erection method based on trackless measurement provided in the embodiments of the application;

[0060] Figure 3 A whole structure schematic diagram (straight line section circular tunnel section) of a circular shield tunnel catenary erection method based on trackless measurement provided in the embodiments of the application;

[0061] Figure 4 A whole structure schematic diagram (straight line section adopts a catenary laser measuring instrument) of a circular shield tunnel catenary erection method based on trackless measurement provided in the embodiments of the application.

[0062] In the drawings, the reference signs are:

[0063] 1, track bed; 11, pantograph center line;

[0064] 2, rail connection line; 21, line center line;

[0065] 3, tunnel center line; 31, tunnel center;

[0066] 4, measurement control point; 41, first reference line; 42, measurement control point; 43, suspension center point; 431, first laser emission line; 432, catenary laser measuring instrument; 4321, leveling bubble; 44, second reference line; 441, second laser emission line. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0068] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications will also change accordingly.

[0069] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] In addition, if the present application has a description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. For example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0071] Embodiments

[0072] Reference Figures 1-4 The present application proposes a kind of based on trackless measurement round shield tunnel contact network erection method, the measurement method is calculated by the position relationship of each design point of round tunnel track, design the suspension center point 43 of contact network in tunnel, not influenced by foundation pile control network CP III data, overall applicability is strong, precision is high, and measurement speed is fast, effectively solve the technical problems in the prior art. It has great popularization value.

[0073] Specifically, the first aspect of the present application provides a kind of round shield tunnel contact network trackless measurement method, comprising:

[0074] According to the basic information of the circular tunnel, the design section information of the circular tunnel is obtained; wherein, the basic information of the circular tunnel includes: the construction type of the circular tunnel, the tunnel center line 3 of the circular tunnel, and the track construction information of the circular tunnel (including but not limited to: track bed 1 and steel rail connection line 2).

[0075] According to the design section information of the circular tunnel, the design relationship between the tunnel center line 3 of the circular tunnel and the track line construction information of the circular tunnel is obtained, and the offset value between the tunnel center line 3 of the circular tunnel and the track line center line 21 is obtained at the same time; that is, according to the tunnel profile in Figures 1-2 , the offset value between the tunnel center line 3 of the circular tunnel and the track line center line 21 is obtained.

[0076] According to the design section information of the circular tunnel, the measurement reference point 4 is constructed, the measurement reference point 42 is obtained by using the vertical mapping of the measurement reference point 4, and the reference line of the measurement reference point 4 and the measurement reference point 42 is obtained by using the measurement reference point 42 and the measurement point;

[0077] According to the distance between the reference line of the measurement reference point 4 and the measurement reference point 42 and the tunnel center line 3 of the circular tunnel, the pull-out value a of the measurement reference point 42 is obtained;

[0078] According to the offset value between the tunnel center line 3 of the circular tunnel and the track line center line 21 and the pull-out value a of the measurement reference point 42, the measurement reference point 42 is adjusted, and the contact net suspension center point 43 is determined according to the adjusted measurement reference point 42;

[0079] According to the determination of the contact net suspension center point 43, the hole pre-buried trackless erection contact net is carried out.

[0080] Referring to Figure 1 and Figure 2 , in this embodiment, in order to facilitate understanding, when the circular tunnel construction section is at a curve section, the method of determining the contact net suspension center point 43 includes:

[0081] The construction type of the circular tunnel is determined to be single-hole single-line, and the circular tunnel construction section is at a curve section;

[0082] The design section information of the curve section circular tunnel (that is, the tunnel profile of the curve section circular tunnel design information refers to Figure 1 and Figure 2According to the circular tunnel profile information (including but not limited to: track bed 1 and rail connection line 2) of the curve section circular tunnel, the track line center line 21 and the pantograph center line 11 are obtained; that is, according to the design section information of the curve section circular tunnel, the offset value between the tunnel center line 3 of the curve section circular tunnel and the track line center line 21 is calculated and obtained; that is, the vertical line with the rail connection line 2 center as the starting point is taken as the track line center line 21, and then the offset value between the tunnel center line 3 of the curve section circular tunnel and the track line center line 21 is obtained. The offset value is calculated and obtained according to the distance between the circular tunnel center 31 and the plane of the rail connection line 2, the superelevation value of the track connection line exceeding the horizontal plane, and the distance between the centers of the two rails (which can be obtained through the tunnel track construction information).

[0083] In the design section information of the curve section circular tunnel, the measurement reference point 4 is selected and controlled, and according to the circular tunnel track construction information and the tunnel center line 3 of the curve section circular tunnel, the measurement reference point 4 is leveled and mapped to obtain the measurement reference point 42;

[0084] The measurement reference point 42 and the measurement reference point 4 are connected to obtain the first reference line 41, and the distance between the measurement reference point 42 and the line center line 21 is calculated according to the track line center line 21. The distance between the measurement reference point 42 and the line center line 21 can be calculated according to the clearance height between the measurement reference point 42 and the rail connection line 2, the superelevation value of the track connection line exceeding the horizontal plane, and the distance between the centers of the two rails;

[0085] According to the offset value between the tunnel center line 3 of the curve section circular tunnel and the track line center line 21 and the distance between the measurement reference point 42 and the line center line 21, the offset value of the measurement reference point 42 is calculated;

[0086] According to the offset value of the measurement reference point 42, the setting position of the measurement reference point 42 is adjusted to obtain the curve section circular tunnel catenary suspension center point 43.

[0087] In this embodiment, the tunnel center 31 of the curve section circular tunnel is on the pantograph center line 11.

[0088] In a possible embodiment, the method for calculating the offset value between the tunnel center line 3 of the curve section circular tunnel and the track line center line 21 includes:

[0089] According to the design section information of the circular tunnel, the track bed 1 parameters and the rail connection line 2 parameters are obtained;

[0090] According to the track bed 1 parameters and the rail connection line 2 parameters and the measurement reference point 42, the clearance height data information between the measurement reference point 42 and the rail connection line 2 is obtained;

[0091] According to the design section information of the circular tunnel, the data information of the superelevation value of the track alignment exceeding the horizontal plane is measured;

[0092] According to the design section information of the circular tunnel, the data information of the center distance between the two rails in the track alignment is measured;

[0093] According to the data information of the clearance height, the data information of the superelevation value, and the data information of the center distance, the distance between the first reference line 41 and the track alignment center line 21 of the curved section circular tunnel is calculated.

[0094] Specifically, in order to facilitate understanding of how to use the above-mentioned data information of the clearance height, the data information of the superelevation value, and the data information of the center distance to calculate the offset value, the following is taken as an example for description: Figure 1 and Figure 2 Suppose that there is an offset value E between the tunnel center line 3 and the track alignment center line 21 of the curved section circular tunnel:

[0095] E = B * h / L (Formula 1)

[0096] In Formula 1, B is the distance (mm) between the center 3 of the circular tunnel and the rail plane;

[0097] h is the superelevation value (mm) of the track;

[0098] L is the center distance (mm) between the two rails.

[0099] In the embodiment, the method for calculating the offset value of the measurement control point 42 comprises:

[0100] According to the design section information of the circular tunnel, the distance between the center 3 of the circular tunnel and the rail alignment plane is obtained;

[0101] According to the design section information of the circular tunnel, the data information of the superelevation value of the track alignment exceeding the horizontal plane is measured;

[0102] According to the design section information of the circular tunnel, the data information of the center distance between the two rails in the track alignment is measured;

[0103] According to the distance between the center 3 of the circular tunnel and the rail alignment plane, the data information of the superelevation value, and the data information of the center distance, the distance between the first reference line and the track alignment center line of the curved section circular tunnel is calculated. Specifically, in order to facilitate understanding of how to use the above-mentioned distance between the center 3 of the circular tunnel and the rail alignment plane, the data information of the superelevation value, and the data information of the center distance to calculate the offset value, the following is taken as an example for description: Figure 1 and Figure 2For example, the method of calculating the offset value of the measurement reference point comprises:

[0104] Let the distance between the measurement reference point and the center line of the track be C:

[0105] C = H * h / L (Formula 2)

[0106] In Formula 2: H - the clearance height (mm) between the measurement reference point 42 and the rail line;

[0107] h - the track super elevation value (mm);

[0108] L - the center-to-center spacing of the rails (mm);

[0109] According to Formula 1 and Formula 2, the offset value Y of the measurement reference point 42 is:

[0110] Y = C - E (Formula 3).

[0111] Referring to Figure 1 and Figure 2 In this embodiment, in order to facilitate understanding, when the circular tunnel construction section is a curve section, how to measure the offset value of the suspension center point 43 of the catenary is illustrated as follows:

[0112] Referring to Figure 1 , in the case of a curved circular shield tunnel, due to the influence of the track super elevation in the circular tunnel, the vertical line of the rail line 2 of the track design does not coincide with the tunnel center line 3 perpendicular to the circular tunnel, that is, the vertical center line of the rail line 2 on the track bed 1. At this time, the position positioned by the laser of the catenary laser measuring instrument 432 (DJJ-7) has a certain offset value from the catenary suspension point, so it is necessary to adjust according to the parameters of the circular tunnel foundation, the parameters of the rail line 2, and the parameters of the track bed 1. The specific adjustment is as follows:

[0113] According to the design section information of the curved section of the circular tunnel (specifically refer to the tunnel profile in Figure 2 , obtain the offset value E between the tunnel center line 3 of the curved section of the circular tunnel and the track center line 21 (that is, the vertical center line of the rail line 2 on the track bed 1);

[0114] As shown in Figure 2 , the catenary laser measuring instrument 432 (DJJ-7) is placed transversely on the measurement reference position 4 in the cross-sectional tunnel profile of the circular tunnel (preferably in Figure 2The first step is to level the overhead contact line laser measuring instrument 432 (DJJ-7) by using the leveling bubble 4321, and then to position the measuring reference point 42 (laser point) on the tunnel profile according to the laser line emitted by the overhead contact line laser measuring instrument 432 (DJJ-7). Then, the distance between the first laser emitting line 431 (i.e. the first reference line 41) and the track center line 21 of the curved section circular tunnel (i.e. C in the figure) is calculated according to the clearance height between the measuring reference point 42 and the rail connecting line 2, the superelevation value of the track connecting line above the horizontal plane, and the center distance between the two rails. At the same time, the offset value E between the tunnel center line 3 of the curved section circular tunnel and the track center line 21 is calculated according to the distance between the center of the circular tunnel 31 and the plane of the rail connecting line 2, the superelevation value of the track connecting line above the horizontal plane, and the center distance between the two rails. Then, the offset value of the measuring reference point 42 is calculated according to the offset value E between the tunnel center line 3 of the curved section circular tunnel and the track center line 21, and the distance between the first laser emitting line 431 (i.e. the first reference line 41) and the track center line 21 of the curved section circular tunnel. Finally, the erection position of the instrument head of the overhead contact line laser measuring instrument 432 (DJJ-7) is adjusted according to the offset value, so that the position of the laser point after the adjustment is the overhead contact line suspension center point 43, and the point is marked by a measuring rod. During construction, the suspension point marked by the measurement can be positioned for punching and embedding. That is, in the embodiment, the method for obtaining the measuring reference point 42 includes using laser mapping. That is, in the embodiment, the measuring reference point 42 can be obtained by erecting a laser measuring device at the measuring reference position 4, and by laser irradiation on the tunnel top surface by the laser measuring device to serve as the measuring reference point 42. Then, the overhead contact line suspension center point 43 is adjusted according to the position of the measuring reference point 42.

[0115] In addition, it should be noted that, under different track superelevation conditions, the position positioned by the laser of the overhead contact line laser measuring instrument 432 (DJJ-7) and the offset value data of the overhead contact line suspension point are determined by the offset value to confirm the suspension center point 43 required for the construction of the overhead contact line. At the same time, in the curved superelevation section of the circular tunnel, due to the low tunnel clearance, in order to ensure that the vehicle clearance in the curved section meets the design requirements, the method of offsetting the track center line 21 to the outside of the tunnel center line 3 is adopted, and it is necessary to ensure that the center of the tunnel 31 is always on the pantograph center line 11.

[0116] In the embodiment, in order to further understand how to obtain the offset of the measurement point in the circular tunnel of the curve section by the above trackless measurement method, taking the contact net engineering of the second phase of the sixth line of the rail transit in a certain area as an example, the diameter of the circular shield tunnel is 5200 mm, the common monolithic track bed is 740 mm from the tunnel bottom to the rail surface, the distance B between the center of the circular tunnel and the rail plane is 1860 mm, the center distance L of the rail is 1506 mm, the clearance height H between the measurement control point 42 and the rail line 2 is 4600 mm, and the calculation results are as shown in Table 1.

[0117] Table 1 Offset value Y (mm) of the circular tunnel curve section at different super-elevations

[0118] Figure 2 h Figure 1 H L C B E Y Serial number 1 10 0 4578 1506 31.8 1860 12.4 19.4 2 20 0 4578 1506 63.6 1860 24.7 38.9 3 30 0 4578 1506 95.4 1860 37.1 58.3 4 40 0 4578 1506 127.2 1860 49.4 77.8 5 50 0 4578 1506 159 1860 61.8 97.2 6 60 0 4578 1506 190.8 1860 74.1 116.6 7 70 0 4578 1506 222.5 1860 86.5 136.1 8 80 0 4578 1506 254.3 1860 98.8 155.5 9 90 0 4578 1506 286.1 1860 111.2 175 10 100 0 4578 1506 317.9 1860 123.5 194.4 11 110 0 4578 1506 349.7 1860 135.9 213.9 12 120 0 4578 1506 383.3 1860 148.2 235.1

[0119] According to the calculation data, the relationship between the offset value Y and the super-elevation h is as follows:

[0120] Y = 2 * h Formula 4

[0121] It should be noted that the Formula 4 does not consider the pull-out value a, and the actual calculation should consider the pull-out value a. The specific operation is as follows: after determining the longitudinal position of the suspension point, the contact net laser measuring instrument 432 (DJJ-7) is placed horizontally on the cross section of the circular tunnel, and the contact net laser measuring instrument 432 (DJJ-7) is leveled by using the leveling bubble 4321. The offset value Y of the contact net laser measuring instrument 432 (DJJ-7) during trackless measurement can be calculated according to the above Formula 4, and since the size of the pull-out value a is not considered, the final offset value Y also needs to determine the horizontal positioning according to the pull-out value a of the suspension point. The specific operation is as follows:

[0122] During construction measurement, when the pull-out value a of the suspension point is greater than 150 mm, the center point positioning point of the suspension point is offset in the direction of the pull-out value a: the offset value is the actual pull-out value a minus 100 mm. The offset value of the suspension point (the center point positioning point of the suspension point) in the trackless measurement curve section = the offset value of the suspension pull-out value a (offset when greater than 150 mm) + the center line of the point arch (the curve direction of the tunnel).

[0123] In the embodiment, for the convenience of understanding, when the construction section of the circular tunnel is a straight section, the method for determining the contact net suspension center point 43 includes the following steps.

[0124] Determining that the construction type of the circular tunnel is single-hole single-line, and the construction section of the circular tunnel is a straight section;

[0125] Obtaining the design section information of the straight section of the circular tunnel, and selecting the measurement control point 4 in the design section information of the straight section of the circular tunnel according to the design feature that the vertical tunnel center line 3 of the straight section of the circular tunnel coincides with the vertical center line of the construction track.

[0126] According to the circular tunnel track line construction information and the straight section circular tunnel horizontal center line, the position of the survey control point 4 is leveled and mapped (i.e. leveling according to the straight section circular tunnel horizontal center line, the position of the survey control point, and the steel rail connecting line 2 being parallel to each other), to obtain the survey control point 42;

[0127] Connecting the survey control point 42 and the survey control point 4, a second reference line 44 is obtained;

[0128] According to the horizontal pull-out value a between the second reference line 44 and the straight section circular tunnel center line 3, the position of the survey control point 42 is adjusted, to obtain the catenary suspension center point 43 of the straight section circular tunnel.

[0129] Referring to Pull-out value a and Remarks In this embodiment, in order to facilitate understanding, when the circular tunnel construction section is a straight section, how to measure the catenary suspension center point 43 is exemplified as follows:

[0130] According to the tunnel design requirements, the circular tunnel is generally a single-hole single-line tunnel, and the design requires that the vertical center line of the straight section tunnel and the vertical center line of the track coincide. At this time, the trackless measurement can be performed at the survey control point 4 by using the catenary laser measuring instrument 432 (DJJ-7), and the characteristics of the vertical center line of the circular tunnel and the vertical center line of the track being coincident are utilized, as shown in Figure 3 and Figure 4 The catenary laser measuring instrument 432 (DJJ-7) is placed horizontally in the survey control point 4 in the cross-sectional tunnel profile of the circular tunnel (preferably in the Figure 3 Figure 4 Figure 4The contact net laser measuring instrument 432 (DJJ-7) is first leveled by using the leveling bubble 4321, and the leveled contact net laser measuring instrument 432 (DJJ-7) is in parallel with the horizontal center line of the circular tunnel and the line connecting the two rails 2. According to the laser line irradiated by the contact net laser measuring instrument 432 (DJJ-7), the measurement reference point 42 (laser point) is positioned and located on the tunnel profile drawing, and then the horizontal distance (i.e. the pull-out value a) between the second laser emitting line 441 (i.e. the second reference line 44) and the tunnel center line 3 of the straight line section circular tunnel is calculated. The erection position of the instrument head of the contact net laser measuring instrument 432 (DJJ-7) is adjusted according to the pull-out value a, so that the position of the laser point after the adjustment is the contact net suspension center point 43, and the point is marked by using a measuring rod. During construction, the hole pre-burial is performed according to the marked suspension point. That is, in the embodiment, the method for obtaining the measurement reference point 42 includes: using laser mapping. That is, in the embodiment, the measurement reference point 42 can be obtained by erecting a laser measuring device at the measurement reference position 4, irradiating laser on the tunnel top surface by the laser measuring device, and then adjusting the contact net suspension center point 43 according to the position of the measurement reference point 42.

[0131] The second aspect of the present application provides a circular shield tunnel contact net erection system based on trackless measurement, which adopts the contact net erection method based on trackless measurement in any one of the first aspect. The measurement system further includes:

[0132] The laser measuring device is used for mapping the measurement point at the measurement reference position 4.

[0133] In the embodiment, the measurement system further includes: the contact net laser measuring instrument 432 during trackless measurement. Preferably, the model of the contact net laser measuring instrument 432 during trackless measurement is (DJJ-7). That is, in the straight line stage, the offset is performed according to the normal offset. The lateral positioning point determined by the contact net laser measuring instrument 432 (DJJ-7) is the position of the suspension center point 43, and the point is marked by using a measuring rod. During construction, the hole pre-burial is performed according to the marked suspension point.

[0134] The above description is only some of the preferred embodiments of the present disclosure and the explanation of the technical principles used. Those skilled in the art should understand that the scope of the application involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the above inventive concept. For example, the above features and the technical features disclosed in the embodiments of the present disclosure (but not limited to) having similar functions are replaced with each other to form a technical solution.

Claims

1. A method for erecting a catenary system for a circular shield tunnel based on trackless measurement, The application relates to a method for determining a catenary suspension center point of a circular tunnel. According to the basic information of the circular tunnel, the design section information of the circular tunnel is acquired; According to the design section information of the circular tunnel, the tunnel center line and the design relationship between the tunnel center line and the track line construction information of the circular tunnel are acquired, and the tunnel center line and the track line center line are offset; According to the design section information of the circular tunnel, the measurement control points are constructed, the measurement control points are acquired through vertical mapping, and the measurement control points and the measurement points are connected to obtain the reference line of the measurement control points and the measurement control points; According to the distance between the reference line of the measurement control points and the measurement control points and the tunnel center line, the pull-out value of the measurement control points is obtained; According to the offset value between the tunnel center line and the track line center line and the pull-out value of the measurement control points, the measurement control points are adjusted, and the catenary suspension center point is determined according to the adjusted measurement control points; According to the determined catenary suspension center point, the hole pre-embedding trackless erection catenary is punched. The method for determining the catenary suspension center point comprises the following steps: The construction type of the circular tunnel is determined as single-hole single-line, and the circular tunnel construction section is at a curve section; According to the design section information of the curve section circular tunnel, the offset value between the curve section tunnel center line and the track line center line is calculated and obtained; The measurement control points are selected in the design section information of the curve section circular tunnel, the measurement control points are obtained through leveling mapping according to the circular tunnel track construction information and the curve section tunnel center line, and the measurement control points and the measurement points are connected to obtain the first reference line, and the distance between the measurement control points and the track line center line is calculated according to the track line center line; According to the offset value between the curve section tunnel center line and the track line center line and the distance between the measurement control points and the track line center line, the offset value of the measurement control points is calculated; According to the offset value of the measurement control points, the setting position of the measurement control points is adjusted to obtain the catenary suspension center point of the curve section circular tunnel. The method for calculating the offset value between the curve section tunnel center line and the track line center line comprises the following steps: The method for calculating the offset value of the measurement control points comprises the following steps: The construction type of the circular tunnel is determined as single-hole single-line, and the circular tunnel construction section is at a straight section; The offset value between the center line of the curve section tunnel and the center line of the track line is E Then: (Formula 1) In formula 1: - distance of the center of the circular tunnel from the plane of the rail (mm); - the value of the track superelevation (mm), i.e. the superelevation value data information of the track alignment above the horizontal plane; - the rail center distance (mm), i.e. the data information of the center distance between two rails in the track line; The design section information of the straight section circular tunnel is acquired, the measurement control points are selected in the design section information of the straight section circular tunnel according to the design feature that the vertical tunnel center line of the straight section circular tunnel coincides with the vertical center line of the construction track, Let the distance between the measurement control point and the center line of the line be : (Formula 2) In formula 2: - measure the clearance height (mm) between the control point and the rail alignment; - value of the rail super-elevation (mm); - rail center distance (mm); Then, according to the formula 1 and the formula 2, the measurement of the control point should be shifted by the value of : (Formula 3); According to the circular tunnel track line construction information and the horizontal center line of the straight section circular tunnel, the measurement control points are obtained through leveling mapping of the measurement control point position, The measurement control points and the measurement control points are connected to obtain the second reference line, According to the horizontal pull-out value between the second reference line and the straight section circular tunnel center line, the position of the measurement control points is adjusted to obtain the catenary suspension center point of the straight section circular tunnel. ​ ​ 2. The method for erecting a circular shield tunnel catenary according to claim 1, wherein, The tunnel center of the curved section circular tunnel is on the pantograph center line.

3. A catenary system for installation in a round shield tunnel based on trackless measurement, characterized in that, The catenary erection system further comprises: The laser measuring device is used for setting the mapping measuring point on the measurement reference position.

4. The catenary system for erecting a circular shield tunnel based on trackless measurement according to claim 3, characterized in that, The catenary erection system further comprises: The laser measuring device uses the catenary laser measuring instrument in trackless measurement.

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