Inverted arch template digital positioning method

Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to an inverted arch formwork digital positioning method which comprises the following steps: S1, determining the current position of a trestle, specifically, determining the direction of a main beam, determining the longitudinal position of a formwork and determining the horizontal position and the elevation position of the formwork; s2, determining the target position of the trestle, wherein the determined target position of the trestle comprises a target direction, a target transverse position and a target elevation position; s3, coarse positioning of the trestle girder, wherein coarse positioning of the trestle girder comprises longitudinal positioning, directional positioning and transverse positioning; s4, trestle formwork accurate positioning, wherein trestle formwork accurate positioning comprises re-determination of the position of a main beam, formwork longitudinal positioning, formwork elevation positioning and formwork transverse positioning; and S5, calculating the positioning error, wherein the calculation of the positioning error comprises calculation of the positioning error, calculation of the mileage, the offset distance and the height difference and calculation of the offset error.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a digital positioning method for an inverted arch template. Background Art

[0002] Currently, the common method used by construction companies to locate tunnel invert formwork is as follows: surveyors use instruments such as total stations to mark reference points on the tunnel sidewalls or other stable locations. Formwork installers then use tools such as tape measures to measure the formwork positioning points at a certain horizontal and vertical offset from the reference points. After formwork installation, dedicated personnel should monitor the formwork during the concrete pouring process to check for any movement.

[0003] This template measurement and positioning method has the following main problems:

[0004] Multiple measurements are required to determine the positioning points. The surveyors' working hours are long and the labor intensity is high. The method of pulling the tape measure is highly random and has low accuracy, which may cause the inverted arch to intrude into the limit and make it impossible to monitor the concrete pouring process in real time, which may lead to over-squareness. In view of this, we propose a digital positioning method for the inverted arch formwork. Summary of the Invention

[0005] The purpose of the present invention is to provide a digital positioning method for an inverted arch formwork in order to solve the problems raised in the above-mentioned background technology in view of the above-mentioned technical problems.

[0006] In view of this, the present invention provides a digital positioning method for an inverted arch formwork, which includes the following steps:

[0007] Step S1, determining the current position of the trestle, wherein determining the current position of the trestle includes determining the direction of the main beam, the longitudinal position of the template, and the horizontal and elevation positions of the template;

[0008] Step S2, determining the trestle target position, said determining the trestle target position includes target direction, target lateral position and target elevation position;

[0009] Step S3, rough positioning of the trestle main beam, wherein the rough positioning of the trestle main beam includes longitudinal positioning, directional positioning and transverse positioning;

[0010] Step S4, accurate positioning of the trestle template, wherein the accurate positioning of the trestle template includes re-determining the main beam position, template longitudinal positioning, template elevation positioning, and template lateral positioning;

[0011] Step S5: Calculating the positioning error, wherein the calculating the positioning error includes calculating the positioning error, calculating the mileage, the offset, the height difference, and the offset error.

[0012] In the above technical solution, further, in step S1, the main beam direction is determined, including the following method:

[0013] Place four target points at the front and rear ends and on the left and right sides of the trestle main beam to collect coordinates. The left and right points at the front end are marked as A1 and A2 respectively. 2， The left and right points at the rear end are denoted as B1 and B2 respectively;

[0014] Four target points are arranged at the front and rear ends and the left and right sides of the main beam of the trestle to collect coordinate data. The target points on the left and right sides of the front end are recorded as A1 and A2 respectively, while the left and right sides of the rear end are recorded as B1 and B2. The actual coordinates of these target points, namely A 1实际 、A 2实际 、B 1实际 、B 2实际 , A 1实际 、A 2实际 、B 1实际 、B 2实际 、A 1实际 、A 2实际 、B 1实际 、B 2实际 , is known and comes from the precise positioning records of the previous version of the measurement;

[0015] The template's longitudinal position is determined by the following methods:

[0016] The coordinate of the midpoint of the front end of the trestle main beam is marked as A 中 , the formula is A 中 =(A 1实际 +A 2实际 ) / 2;

[0017] The coordinate of the midpoint of the rear end of the trestle main beam is marked as B 中 , the formula is B 中 =(B 1实际 +B 2实际 ) / 2;

[0018] The direction of the trestle main beam is denoted as V 实际 , from the rear midpoint B 中 Pointing to the front midpoint A 中 Vector expression of ;

[0019] Determination of the longitudinal position of the template: The inverted arch template is located below the main beam of the trestle and is moved along the main beam by the traction of the longitudinal moving trolley;

[0020] The longitudinal trolley is installed at the front end of the template and is equipped with a distance meter to accurately measure the longitudinal distance between the inverted arch template and the measuring point A at the front end of the main beam, which is recorded as l 模 ;

[0021] The template level and elevation position are determined by the following methods:

[0022] Install horizontal distance meters on both sides of the main beam, and record the height difference between the measured elevation and the inner rail elevation as Δ 轨 The distance measurement point on the left is marked as C1, and the one on the right is C2. Through these sensors, the distance from the template to the outside of the trestle main beam is measured, and the left side is recorded as w1, and the right side is recorded as w2. At the same time, the width of the trestle main beam itself is recorded as wmain beam;

[0023] Install a vertical distance meter at the bottom of the main beam. Mark the vertical distance measurement point on the left as D1 and on the right as D2. Measure the distance from the template to the bottom of the main beam. Mark the left side as h1 and the right side as h2.

[0024] In the above technical solution, further, in step S2, the target direction includes the following method:

[0025] By entering the relevant data of the tunnel center curve, a three-dimensional space curve can be obtained. The target direction is expressed by the tangent vector at the target mileage of the curve, which is recorded as V 目标 , it is stipulated that the default direction is the forward direction of the trestle;

[0026] Target lateral position includes the following methods:

[0027] The target horizontal position is specified as follows: the trestle main beam and the inverted arch template are horizontally centered relative to the tunnel centerline. At this time, the measurement value of the horizontal distance meter on the left and right sides from the main beam is the standard width w 标 , that is, w1=w2=w 标 ;

[0028] Target elevation position, including the following methods:

[0029] Target elevation position of the trestle main beam: The elevation position of the trestle main beam should meet the following conditions:

[0030] Sufficient working space should be left at the bottom of the main beam to ensure construction safety and convenience;

[0031] The pressure of the outrigger cylinder should not be too high to ensure the stability and service life of the equipment;

[0032] Therefore, the target elevation position is specified as the bottom of the trestle main beam being 35 cm below the inner rail elevation;

[0033] Target elevation position of inverted arch formwork:

[0034] The bottom surface of the inverted arch formwork is aligned with the top surface of the inverted arch lining to ensure the accurate formation of the lining structure;

[0035] When the trestle main beam and the inverted arch template are both at the target elevation, the distances between the vertical distance measuring instruments on the left and right sides and the bottom of the main beam are equal, that is, h1 = h2 = h 标 .

[0036] In the above technical solution, further, in step S3, the longitudinal positioning is:

[0037] The trestle is moved forward 12 meters longitudinally through the following steps:

[0038] Step (1), determine the initial distance: install a distance meter pointing to the front leg on the middle leg of the trestle, and record the initial distance as Q = q1;

[0039] Step (2): The middle legs play a supporting role, the front legs are retracted, and the trestle moves forward 6 meters, so that Q = q1 + 6;

[0040] Step (3): lower the front leg, fold up the middle leg, and move the middle leg forward 6 meters to make Q = q1;

[0041] Step (4): repeat steps (2) and (3) to move the trestle forward another 6 meters.

[0042] Through the above steps, the trestle can achieve longitudinal movement and positioning.

[0043] In the above technical solution, further, in step S3, direction positioning:

[0044] Adjust the direction of the trestle to within the allowable error range. The specific adjustment method is as follows:

[0045] Define the parameters:

[0046] α: vector V 实际 With V 目标 The projection angle in the horizontal direction, V 实际 Rotate counterclockwise at an acute angle to V 目标 Coincidence is positive, the opposite is negative;

[0047] β: vector V 实际 The angle with the horizontal plane is positive when the trestle is in a downhill posture;

[0048] L 梁 : longitudinal length of the main beam;

[0049] Adjustment method:

[0050] Keep the front end support leg of the main beam fixed and adjust α by moving the rear end support leg horizontally; the horizontal movement distance is recorded as x1, and the calculation method is: x1 = |L 梁 *cosβ|*tan(α / 180*π);

[0051] When α is positive, the rear leg moves horizontally to the right; when α is positive, the rear leg moves horizontally to the left;

[0052] Through the above-mentioned lateral movement operation, the α value is gradually reduced until it falls within the allowable error range, thereby achieving the adjustment of the trestle direction;

[0053] Horizontal positioning:

[0054] Convert the measured coordinates in A into the expression of mileage and offset (left offset is specified as positive), and record the offset as x2. The front and rear legs of the trestle are simultaneously offset to the right by the value of x2 to align the trestle with the tunnel horizontally.

[0055] In the above technical solution, further, in step S4, the main beam position is determined again, including the following method:

[0056] Measure the coordinates of the four points A1, A2, B1, and B2 of the trestle, adjust the level of the trestle so that the elevation A1 = A2, B1 = B2, and determine the four characteristic points A 1实际 、A 2实际 、B 1实际 、B 2实际 The new coordinates of

[0057] Calculate relevant data A 中 、B 中 、V 实际 The new value of

[0058] Template vertical positioning, including the following methods:

[0059] By A 中 The mileage position of the coordinate calculation is recorded as m1, and the target mileage position of the front end of the inverted arch template is m2; the longitudinal trolley is controlled to move so that the trolley distance meter measures the value l 模 =|m1-m2|, thus moving the template to m2 mileage;

[0060] Template elevation positioning, including the following methods:

[0061] Calculate A 1实际 、A 2实际 The elevation difference from the design position is recorded as Δh1 and Δh2. The elevation difference Δh3 of the bottom of the main beam at the m1 and m2 mileages is determined by the following calculation method:

[0062] When β is positive, Δh3=|m1-m2|*tan(β / 180*π);

[0063] When β is negative, Δh3=-|m1-m2|*tan(β / 180*π);

[0064] Adjust the template longitudinal cylinder so that the vertical distance meter measurement value meets the following conditions to reach the target elevation position:

[0065] h1=h 底 +Δh1+Δh3;

[0066] h2=h 底 +Δh2+Δh3;

[0067] Template lateral positioning, including the following methods:

[0068] A 中 The measured coordinates are converted into the expression of mileage and offset (left deviation is specified as positive), and the offset is recorded as x2; adjust the template horizontal cylinder so that the horizontal distance meter measurement value meets the following requirements:

[0069] w1=w 标 -x2;

[0070] w2=w 标 +x2.

[0071] In the above technical solution, further, in step S5, determining the actual horizontal and vertical distances includes: recording h 1实际 、h 2实际 、w 1实际 、w 2实际 Measurement value;

[0072] Calculation of mileage, offset, and elevation difference includes:

[0073] The mileage of C1 and C2 is m2;

[0074] The vertical offset between C1 and C2 and the inner rail elevation point is recorded as h C1 、h C2 , the calculation method is:

[0075] h C1 =h 标 -h 1实际 +Δ 轨 ;

[0076] h C2 =h 标 -h 2实际 +Δ 轨 ;

[0077] The horizontal offset between C1 and C2 and the tunnel centerline is recorded as l C1 、l C2 , the calculation method is:

[0078] l C1 =w 1实际 +w 主梁 / 2+Δw;

[0079] l C2 =-(w 2实际 +w 主梁 / 2-Δw);

[0080] Calculating the offset error involves:

[0081] Convert the actual and target mileages, vertical offsets, and horizontal offsets of points C1 and C2 into coordinates expressed in XYZ format, and calculate the deviation between the actual and target coordinates.

[0082] The beneficial effects of the present invention are:

[0083] 1. This digital positioning method for the inverted arch formwork, by installing target points and rangefinders on the inverted arch trestle and combining information and digital means, can determine the specific extension and contraction requirements of each control cylinder during the positioning of the inverted arch formwork, thereby improving the accuracy of measurement and positioning.

[0084] 2. The digital positioning method of the inverted arch formwork can automatically monitor the concrete pouring process and automatically alarm when the formwork displacement exceeds the threshold, which can reduce the number of measurements.

[0085] 3. The digital positioning method of the inverted arch template can automatically store and convert historical measurement data into technical information, reducing the labor intensity of surveyors and ensuring the authenticity and accuracy of measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 is a flow chart of the present invention;

[0087] Figure 2 It is the main beam target point location diagram of the present invention;

[0088] Figure 3 It is the main beam direction diagram of the present invention;

[0089] Figure 4 It is the template longitudinal distance measurement diagram of the present invention;

[0090] Figure 5 It is the template level and elevation measurement map of the present invention;

[0091] Figure 6 is the target pattern of the present invention;

[0092] Figure 7 It is the lateral movement distance calculation diagram of the present invention;

[0093] Figure 8 It is the horizontal offset distance calculation diagram of the present invention. DETAILED DESCRIPTION

[0094] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0095] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0096] It should be noted that the terms "first," "second," etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and that the objects distinguished by "first," "second," etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0097] It should be noted that, in the description of this application, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional terms "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0098] It should be noted that, in the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0099] Example 1:

[0100] See also Figures 1-8 As shown, this embodiment provides a digital positioning method for an inverted arch formwork.

[0101] The following steps are involved:

[0102] Step S1, determining the current position of the trestle, wherein determining the current position of the trestle includes determining the direction of the main beam, the longitudinal position of the template, and the horizontal and elevation positions of the template;

[0103] Step S2, determining the trestle target position, determining the trestle target position includes target direction, target lateral position and target elevation position;

[0104] Step S3, rough positioning of the trestle main beam, the rough positioning of the trestle main beam includes longitudinal positioning, directional positioning and transverse positioning;

[0105] Step S4, accurate positioning of the trestle template, which includes re-determining the main beam position, template longitudinal positioning, template elevation positioning, and template lateral positioning;

[0106] Step S5: Calculate the positioning error. Calculating the positioning error includes calculating the positioning error, calculating the mileage, offset, height difference, and calculating the offset error.

[0107] Example 2:

[0108] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0109] In step S1, the main beam direction is determined, including the following methods:

[0110] Place four target points at the front and rear ends and on the left and right sides of the trestle main beam to collect coordinates. The left and right points at the front end are marked as A1 and A2, and the left and right points at the rear end are marked as B1 and B2.

[0111] Four target points are arranged at the front and rear ends and the left and right sides of the main beam of the trestle to collect coordinate data. The target points on the front and left sides are marked as A1 and A2 respectively, while the target points on the left and right sides of the rear are marked as B1 and B2. The actual coordinates of these target points, namely A 1实际 、A 2实际 、B 1实际 、B 2实际 , A 1实际 、A 2实际 、B 1实际 、B 2实际 、A 1实际 、A 2实际 、B 1实际 、B 2实际 , is known and comes from the precise positioning records of the previous version of the measurement;

[0112] The template's longitudinal position is determined by the following methods:

[0113] The coordinate of the midpoint of the front end of the trestle main beam is marked as A 中 , the formula is A 中 =(A 1实际 +A 2实际 ) / 2;

[0114] The coordinate of the midpoint of the rear end of the trestle main beam is marked as B 中 , the formula is B 中 =(B 1实际 +B 2实际 ) / 2;

[0115] The direction of the trestle main beam is denoted as V 实际 , from the rear midpoint B 中 Pointing to the front midpoint A 中 Vector expression of ;

[0116] Determination of the longitudinal position of the template: The inverted arch template is located below the main beam of the trestle and is moved along the main beam by the traction of the longitudinal moving trolley;

[0117] The longitudinal trolley is installed at the front end of the template and is equipped with a distance meter to accurately measure the longitudinal distance between the inverted arch template and the measuring point A at the front end of the main beam, which is recorded as l 模 ;

[0118] The template level and elevation position are determined by the following methods:

[0119] Install horizontal distance meters on both sides of the main beam, and record the height difference between the measured elevation and the inner rail elevation as Δ 轨The distance measurement point on the left is marked as C1, and the right is C2. Through these sensors, the distance from the template to the outside of the trestle main beam is measured, and the left side is recorded as w1, and the right side is recorded as w2. At the same time, the width of the trestle main beam itself is recorded as w 主梁 ;

[0120] Install a vertical distance meter at the bottom of the main beam. Mark the vertical distance measurement point on the left as D1 and on the right as D2. Measure the distance from the template to the bottom of the main beam. Mark the left side as h1 and the right side as h2.

[0121] Example 3:

[0122] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0123] Among them, in step S2, the target direction includes the following methods:

[0124] By entering the relevant data of the tunnel center curve, a three-dimensional space curve can be obtained. The target direction is expressed by the tangent vector at the target mileage of the curve, which is recorded as V 目标 , it is stipulated that the default direction is the forward direction of the trestle;

[0125] Target lateral position includes the following methods:

[0126] The target horizontal position is specified as follows: the trestle main beam and the inverted arch template are horizontally centered relative to the tunnel centerline. At this time, the measurement value of the horizontal distance meter on the left and right sides from the main beam is the standard width w 标 , that is, w1=w2=w 标 ;

[0127] Target elevation position, including the following methods:

[0128] Target elevation position of the trestle main beam: The elevation position of the trestle main beam should meet the following conditions:

[0129] Sufficient working space should be left at the bottom of the main beam to ensure construction safety and convenience;

[0130] The pressure of the outrigger cylinder should not be too high to ensure the stability and service life of the equipment;

[0131] Therefore, the target elevation position is specified as the bottom of the trestle main beam being 35 cm below the inner rail elevation;

[0132] Target elevation position of inverted arch formwork:

[0133] The bottom surface of the inverted arch formwork is aligned with the top surface of the inverted arch lining to ensure the accurate formation of the lining structure;

[0134] When the trestle main beam and the inverted arch template are both at the target elevation, the distances between the vertical distance measuring instruments on the left and right sides and the bottom of the main beam are equal, that is, h1 = h2 = h 标 .

[0135] Example 4:

[0136] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0137] Among them, in the above technical solution, further, in step S3, longitudinal positioning:

[0138] The trestle is moved forward 12 meters longitudinally through the following steps:

[0139] Step (1), determine the initial distance: install a distance meter pointing to the front leg on the middle leg of the trestle, and record the initial distance as Q = q1;

[0140] Step (2): The middle legs play a supporting role, the front legs are retracted, and the trestle moves forward 6 meters, so that Q = q1 + 6;

[0141] Step (3): lower the front leg, fold up the middle leg, and move the middle leg forward 6 meters to make Q = q1;

[0142] Step (4): repeat steps (2) and (3) to move the trestle forward another 6 meters.

[0143] Through the above steps, the trestle can achieve longitudinal movement and positioning.

[0144] Example 5:

[0145] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0146] Among them, in step S3, direction positioning:

[0147] Adjust the direction of the trestle to within the allowable error range. The specific adjustment method is as follows:

[0148] Define the parameters:

[0149] α: vector V 实际 With V 目标 The projection angle in the horizontal direction, V 实际 Rotate counterclockwise at an acute angle to V 目标 Coincidence is positive, the opposite is negative;

[0150] β: vector V 实际 The angle with the horizontal plane is positive when the trestle is in a downhill posture;

[0151] L 梁: longitudinal length of the main beam;

[0152] Adjustment method:

[0153] Keep the front end support leg of the main beam fixed and adjust α by moving the rear end support leg horizontally; the horizontal movement distance is recorded as x1, and the calculation method is: x1 = |L 梁 *cosβ|*tan(α / 180*π);

[0154] When α is positive, the rear leg moves horizontally to the right; when α is positive, the rear leg moves horizontally to the left;

[0155] Through the above-mentioned lateral movement operation, the α value is gradually reduced until it falls within the allowable error range, thereby achieving the adjustment of the trestle direction;

[0156] Horizontal positioning:

[0157] Convert the measured coordinates in A into the expression of mileage and offset (left offset is specified as positive), and record the offset as x2. The front and rear legs of the trestle are simultaneously offset to the right by the value of x2 to align the trestle with the tunnel horizontally.

[0158] Example 6:

[0159] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0160] Among them, in step S4, the main beam position is determined again, including the following method:

[0161] Measure the coordinates of the four points A1, A2, B1, and B2 of the trestle, adjust the level of the trestle so that the elevation A1 = A2, B1 = B2, and determine the four characteristic points A 1实际 、A 2实际 、B 1实际 、B 2实际 The new coordinates of

[0162] Calculate relevant data A 中 、B 中 、V 实际 The new value of

[0163] Template vertical positioning, including the following methods:

[0164] By A 中 The mileage position of the coordinate calculation is recorded as m1, and the target mileage position of the front end of the inverted arch template is m2; the longitudinal trolley is controlled to move so that the trolley distance meter measures the value l 模 =|m1-m2|, thus moving the template to m2 mileage;

[0165] Template elevation positioning, including the following methods:

[0166] Calculate A 1实际 、A 2实际 The elevation difference from the design position is recorded as Δh1 and Δh2. The elevation difference Δh3 of the bottom of the main beam at the m1 and m2 mileages is determined by the following calculation method:

[0167] When β is positive, Δh3=|m1-m2|*tan(β / 180*π);

[0168] When β is negative, Δh3=-|m1-m2|*tan(β / 180*π);

[0169] Adjust the template longitudinal cylinder so that the vertical distance meter measurement value meets the following conditions to reach the target elevation position:

[0170] h1=h 底 +Δh1+Δh3;

[0171] h2=h 底 +Δh2+Δh3;

[0172] Template lateral positioning, including the following methods:

[0173] A 中 The measured coordinates are converted into the expression of mileage and offset (left deviation is specified as positive), and the offset is recorded as x2; adjust the template horizontal cylinder so that the horizontal distance meter measurement value meets the following requirements:

[0174] w1=w 标 -x2;

[0175] w2=w 标 +x2.

[0176] Example 7:

[0177] This embodiment provides a digital positioning method for an inverted arch formwork, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0178] In step S5, determining the actual horizontal and vertical distances includes: recording h 1实际 、h 2实际 、w 1实际 、w 2实际 Measurement value;

[0179] Calculation of mileage, offset, and elevation difference includes:

[0180] The mileage of C1 and C2 is m2;

[0181] The vertical offset between C1 and C2 and the inner rail elevation point is recorded as h C1 、h C2 , the calculation method is:

[0182] h C1=h 标 -h 1实际 +Δ 轨 ;

[0183] h C2 =h 标 -h 2实际 +Δ 轨 ;

[0184] The horizontal offset between C1 and C2 and the tunnel centerline is recorded as l C1 、l C2 , the calculation method is:

[0185] l C1 =w 1实际 +w 主梁 / 2+Δw;

[0186] l C2 =-(w 2实际 +w 主梁 / 2-Δw);

[0187] Calculating the offset error involves:

[0188] Convert the actual and target mileages, vertical offsets, and horizontal offsets of points C1 and C2 into coordinates expressed in XYZ format, and calculate the deviation between the actual and target coordinates.

[0189] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A digital positioning method for an inverted arch formwork, characterized in that: The following steps are involved: Step S1, determining the current position of the trestle, wherein determining the current position of the trestle includes determining the direction of the main beam, the longitudinal position of the template, and the horizontal and elevation positions of the template; Step S2, determining the trestle target position, said determining the trestle target position includes target direction, target lateral position and target elevation position; Step S3, rough positioning of the trestle main beam, wherein the rough positioning of the trestle main beam includes longitudinal positioning, directional positioning and transverse positioning; Step S4, accurate positioning of the trestle template, wherein the accurate positioning of the trestle template includes re-determining the main beam position, template longitudinal positioning, template elevation positioning, and template lateral positioning; Step S5: Calculating the positioning error, wherein the calculating the positioning error includes calculating the positioning error, calculating the mileage, the offset, the height difference, and the offset error.

2. The digital positioning method for an inverted arch formwork according to claim 1, characterized in that: In step S1, the main beam direction is determined, including the following method: Place four target points at the front and rear ends and on the left and right sides of the trestle main beam to collect coordinates. The left and right points at the front end are marked as A1 and A2 respectively. 2， The left and right points at the rear end are denoted as B1 and B2 respectively; Four target points are arranged at the front and rear ends and the left and right sides of the main beam of the trestle to collect coordinate data. The target points on the front and left sides are marked as A1 and A2 respectively, while the target points on the left and right sides of the rear are marked as B1 and B2. The actual coordinates of these target points, namely A 1实际 、A 2实际 、B 1实际 、B 2实际 ; The template's longitudinal position is determined by the following methods: The coordinate of the midpoint of the front end of the trestle main beam is marked as A 中 , the formula is A 中 =(A 1实际 +A 2实际 ) / 2; The coordinate of the midpoint of the rear end of the trestle main beam is marked as B 中 , the formula is B 中 =(B 1实际 +B 2实际 ) / 2; The direction of the trestle main beam is denoted as V 实际 , from the rear midpoint B 中 Pointing to the front midpoint A 中 Vector expression of ; Determination of the longitudinal position of the template: The inverted arch template is located below the main beam of the trestle and is moved along the main beam by the traction of the longitudinal moving trolley; The longitudinal trolley is installed at the front end of the template and is equipped with a distance meter to accurately measure the longitudinal distance between the inverted arch template and the measuring point A at the front end of the main beam, which is recorded as l 模 ; The template level and elevation position are determined by the following methods: Install horizontal distance meters on both sides of the main beam, and record the height difference between the measured elevation and the inner rail elevation as Δ 轨 The distance measurement point on the left is marked as C1, and the one on the right is C2. Through these sensors, the distance from the template to the outside of the trestle main beam is measured, and the left side is recorded as w1, and the right side is w2. At the same time, the width of the trestle main beam itself is recorded as wmain beam; Install a vertical distance meter at the bottom of the main beam. Mark the vertical distance measurement point on the left as D1 and on the right as D2. Measure the distance from the template to the bottom of the main beam. Mark the left side as h1 and the right side as h2.

3. The digital positioning method for an inverted arch formwork according to claim 1, characterized in that: In step S2, the target direction includes the following methods: By entering the relevant data of the tunnel center curve, a three-dimensional space curve can be obtained. The target direction is expressed by the tangent vector at the target mileage of the curve, which is recorded as V 目标 , it is stipulated that the default direction is the forward direction of the trestle; Target lateral position includes the following methods: The target horizontal position is specified as follows: the trestle main beam and the inverted arch template are horizontally centered relative to the tunnel centerline. At this time, the measurement value of the horizontal distance meter on the left and right sides from the main beam is the standard width w 标 , that is, w1=w2=w 标 ; Target elevation position, including the following methods: Target elevation position of the trestle main beam: The elevation position of the trestle main beam should meet the following conditions: Sufficient working space should be left at the bottom of the main beam to ensure construction safety and convenience; The pressure of the outrigger cylinder should not be too high to ensure the stability and service life of the equipment; Therefore, the target elevation position is specified as the bottom of the trestle main beam being 35 cm below the inner rail elevation; Target elevation position of inverted arch formwork: The bottom surface of the inverted arch formwork is aligned with the top surface of the inverted arch lining to ensure the accurate formation of the lining structure; When the trestle main beam and the inverted arch template are both at the target elevation, the distances between the vertical distance measuring instruments on the left and right sides and the bottom of the main beam are equal, that is, h1 = h2 = h 标 .

4. The digital positioning method for an inverted arch formwork according to claim 1, characterized in that: In step S3, longitudinal positioning: The trestle is moved forward 12 meters longitudinally through the following steps: Step (1), determine the initial distance: install a distance meter pointing to the front leg on the middle leg of the trestle, and record the initial distance as Q = q1; Step (2): The middle legs play a supporting role, the front legs are retracted, and the trestle moves forward 6 meters, so that Q = q1 + 6; Step (3): lower the front leg, fold up the middle leg, and move the middle leg forward 6 meters to make Q = q1; Step (4): repeat steps (2) and (3) to move the trestle forward another 6 meters. Through the above steps, the trestle can achieve longitudinal movement and positioning.

5. The digital positioning method for inverted arch formwork according to claim 1, characterized in that: In step S3, direction positioning: Adjust the direction of the trestle to within the allowable error range. The specific adjustment method is as follows: Define the parameters: α: vector V 实际 With V 目标 The projection angle in the horizontal direction, V 实际 Rotate counterclockwise at an acute angle to V 目标 Coincidence is positive, the opposite is negative; β: vector V 实际 The angle with the horizontal plane is positive when the trestle is in a downhill posture; L 梁 : longitudinal length of the main beam; Adjustment method: Keep the front end support leg of the main beam fixed and adjust α by moving the rear end support leg horizontally; the horizontal movement distance is recorded as x1, and the calculation method is: x1 = |L 梁 *cosβ|*tan(α / 180*π); When α is positive, the rear leg moves horizontally to the right; when α is positive, the rear leg moves horizontally to the left; Through the above-mentioned lateral movement operation, the α value is gradually reduced until it falls within the allowable error range, thereby achieving the adjustment of the trestle direction; Horizontal positioning: Convert the measured coordinates in A into the expression of mileage and offset (left offset is specified as positive), and record the offset as x2. The front and rear legs of the trestle are simultaneously offset to the right by the value of x2 to align the trestle with the tunnel horizontally.

6. The digital positioning method for an inverted arch formwork according to claim 1, characterized in that: In step S4, the main beam position is determined again, including the following method: Measure the coordinates of the four points A1, A2, B1, and B2 of the trestle, adjust the level of the trestle so that the elevation A1 = A2, B1 = B2, and determine the four characteristic points A 1实际 、A 2实际 、B 1实际 、B 2实际 The new coordinates of Calculate relevant data A 中 、B 中 、V 实际 The new value of Template vertical positioning, including the following methods: By A 中 The mileage position of the coordinate calculation is recorded as m1, and the target mileage position of the front end of the inverted arch template is m2; the longitudinal trolley is controlled to move so that the trolley distance meter measures the value l 模 =|m1-m2|, thus moving the template to m2 mileage; Template elevation positioning, including the following methods: Calculate A 1实际 、A 2实际 The elevation difference from the design position is recorded as Δh1 and Δh2. The elevation difference Δh3 of the bottom of the main beam at the m1 and m2 mileages is determined by the following calculation method: When β is positive, Δh3=|m1-m2|*tan(β / 180*π); When β is negative, Δh3=-|m1-m2|*tan(β / 180*π); Adjust the template longitudinal cylinder so that the vertical distance meter measurement value meets the following conditions to reach the target elevation position: h1=h 底 +Δh1+Δh3; h2=h 底 +Δh2+Δh3; Template lateral positioning, including the following methods: A 中 The measured coordinates are converted into the expression of mileage and offset, with the offset recorded as x2; the template horizontal cylinder is adjusted so that the horizontal distance meter measurement value satisfies: w1=w 标 -x2; <h2 style=";text-align:left;direction:ltr">w2 = w<h2 style=";text-align:left;direction:ltr"> 标 <h2 style=";text-align:left;direction:ltr"> +x2.

7. The digital positioning method for an inverted arch formwork according to claim 1, characterized in that: In step S5, determining the actual horizontal and vertical distances includes: recording h 1实际 、h 2实际 、w 1实际 、w 2实际 Measurement value; Calculation of mileage, offset, and elevation difference includes: The mileage of C1 and C2 is m2; The vertical offset between C1 and C2 and the inner rail elevation point is recorded as h C1 、h C2 , the calculation method is: h C1 =h 标 -h 1实际 +Δ 轨 ; h C2 =h 标 -h 2实际 +Δ 轨 ; The horizontal offset between C1 and C2 and the tunnel centerline is recorded as l C1 、l C2 , the calculation method is: l C1 =in 1实际 +in 主梁 / 2+Δw; l C2 =-(in 2实际 +in 主梁 / 2-Δw); Calculating the offset error involves: Convert the actual and target mileages, vertical offsets, and horizontal offsets of points C1 and C2 into coordinates expressed in XYZ format, and calculate the deviation between the actual and target coordinates.

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