Method and system for correcting temperature deformation in construction process of cable bent towers of cable-stayed bridge and suspension bridge

Abstract

The invention provides a temperature deformation correction method and system in the cable-stayed bridge and suspension bridge cable bent tower construction process, and relates to the technical field of cable-stayed bridge and suspension bridge cable bent tower construction. According to the temperature deformation correction method, two prism points are set, corresponding calibration and correction are carried out through coordinate value observation, a related system is designed according to the method, and real-time correction is carried out through the correction unit according to numerical value changes of the first observation unit and the second observation unit. According to the method, the defects in the prior art are overcome, any spatial position after the temperature change influence quantity is corrected can be determined through the two prism points, the influence of the temperature on the bridge tower column formwork erecting coordinates can be effectively avoided, and lofting work does not need to be stopped in the time period with large temperature influence such as high temperature.

Description

Technical Field

[0001] The invention relates to the technical field of cable-stayed bridge and suspension bridge tower construction, and in particular to a method and system for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers. Background Art

[0002] Due to the change of the tower temperature field (relative to the design reference temperature), the tower spatial position shifts. This shift increases with the increase of tower height and the increase of temperature change. For high-height cable tower structures, the influence of temperature change cannot be ignored and reliable methods need to be adopted to deal with it.

[0003] There are two existing methods for dealing with the above situation: (1) When the temperature change is not large and the tower construction height is not high, the method of avoiding temperature change is mainly used to carry out the layout and final acceptance of the control point coordinates. (2) When the temperature influence is large and the method of avoiding temperature influence cannot be used, the method of calculating the temperature influence and correcting it is used. During the layout and final measurement of the tower construction, the control point coordinates are adjusted according to the calculated influence (the calculation of the adjustment amount can be completed on site). If the temperature avoidance method is selected, the layout of the template can only be carried out under specific temperature conditions at night, which is very unfavorable to the construction period of the main project. The traditional single prism tracking prism method can only determine one point, and only replaces the correction amount when setting up the mold with the change amount of this point, ignoring the spatial difference between the mold setting point and the prism point, which is easy to cause inaccurate actual results. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method and system for correcting temperature deformation during the construction process of cable-stayed bridge and suspension bridge towers, and through the setting and observation of double prisms, the tower structure formwork is made close to the theoretical value.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented through the following technical solutions:

[0006] The method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers includes the following steps:

[0007] (1) Install the first prism and the second prism on the tower climbing formwork, with the height difference between the two prisms being 3m to 8m;

[0008] (2) Observe the two prism points between 3:00 and 5:00 a.m. before adjusting the mold. At this time, the tower deviation caused by the relatively uniform ambient temperature is very small. The measurement data at this time is called the "zero point coordinate". The coordinates of the measurement point of the first prism (hereinafter referred to as measurement point 1) are marked as (x 01 ,y 01 , z 01 ), the coordinates of the measuring point of the second prism (hereinafter referred to as measuring point 2) are marked as (x 02 ,y 02, z 02 );

[0009] (3) When laying out the template, measure the two prisms. The coordinates of the measuring point of the first prism (hereinafter referred to as measuring point 1') are marked as (x 11 ,y 11 , z 11 ), the coordinates of the measuring point of the second prism (hereinafter referred to as measuring point 2') are marked as (x 12 ,y 12 , z 12 ); the coordinates of the stakeout point (hereinafter also referred to as measuring point 3') are marked as (x 13 ,y 13 , z 13 );

[0010] (4) The true coordinates of the mold erection point (hereinafter referred to as measuring point 3) are calculated through the zero point coordinates, and then the true coordinates of measuring point 3 are used to make real-time corrections to the coordinates of the layout point (the control point, hereinafter referred to as measuring point 3').

[0011] The calculated coordinates of point 3 (x 03 ,y 03 , z 03 )for:

[0012] z 03 =z 01 +l·cosα;

[0013] x 03 =x 01 +l·sinα·sinβ;

[0014] y 03 =y 01 +l·sinα·cosβ;

[0015] Where l is the distance between measuring point 3 and measuring point 1, α is the angle between the spatial straight line formed by measuring points 1 and 2 and the z-axis; β is the angle between the projection of the straight line onto the xoy plane and the y-axis.

[0016] Corrected coordinates of point 3' (x 13 ,y 13 , z 13 )for:

[0017] z 13 =z 11 +l·cosα′;

[0018] x 13 =x 11 +l·sinα'·sinβ';

[0019] y 13 =y11 +l·sinα'·cosβ';

[0020] Among them, α' is the angle formed by the spatial straight line formed by measuring point 1' and measuring point 2' and the z-axis; β' is the angle formed by the projection of the straight line onto the xoy plane and the y-axis.

[0021] And the angles are calculated as follows:

[0022]

[0023] Similarly, sinα', cosα', sinβ' and cosβ' can be calculated.

[0024] Accordingly, the present invention also provides a temperature deformation correction system for cable-stayed bridge and suspension bridge tower construction process, which comprises: a first prism and a second prism installed on the tower climbing formwork, the height difference between the two prisms is 3m to 8m, a first observation unit, a second observation unit and a correction unit

[0025] The first observation unit observes two prism points before preparing for mold adjustment. The measured data at this time is called "zero point coordinates". The coordinates of measurement point 1 are marked as (x 01 ,y 01 , z 01 ), the coordinates of measuring point 2 are marked as (x 02 ,y 02 , z 02 );

[0026] The second observation unit measures two prisms when staking out the template. The coordinates of the measuring point 1' are marked as (x 11 ,y 11 , z 11 ), the coordinates of the measuring point 2' are marked as (x 12 ,y 12 , z 12 ); the coordinates of the measuring point 3' are marked as (x 13 ,y 13 , z 13 );

[0027] The correction unit is used to calculate the real coordinates of the measuring point 3 through the zero point coordinates, and then use the real coordinates of the mold erection point to perform real-time correction on the coordinates of the measuring point 3'.

[0028] The present invention provides a method and system for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers, which has the following advantages over the prior art:

[0029] The present invention can determine any spatial position after the temperature change influence amount is corrected through two prism points, and can effectively avoid the influence of temperature on the coordinates of the bridge tower column formwork, without stopping the layout work during the period of high temperature or other temperature influence. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a temperature deformation correction method according to Embodiment 2 of the present invention;

[0031] Figure 2 This is a schematic diagram of calculating the correction value in Example 2 of the present invention;

[0032] Figure 3 This is a schematic diagram of the tower offset in Example 2 of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] Establishment of temperature deformation correction system during construction of cable-stayed bridge and suspension bridge towers:

[0036] 1. Weld two prism supports (the relative position of the prism supports will not change) prism 1 and prism 2 on the tower climbing formwork. The height difference between the two prisms can be 3m to 8m (when the climbing formwork cannot ensure the stability of the prism after installation, consider adjusting the welding position to the tower column and pre-embed the welding parts in advance);

[0037] 2. The night before the mold adjustment, the ambient temperature is relatively uniform (usually 3 to 5 hours in the morning). At this time, the tower deviation caused by the uniform ambient temperature is very small. Install the prism and observe the two prism measuring points. The measurement data at this time is called the "zero point coordinate". The coordinates of measuring point 1 are marked as (x 01 ,y 01 , z 01 ), the coordinates of measuring point 2 are marked as (x 02 ,y 02 , z 02 );

[0038] 3. When laying out the template, first measure the two prism points. The coordinates of point 1' are marked as (x 11 ,y 11 , z 11 ), the coordinates of point 2' are marked as (x 12 ,y 12 , z 12 ); the coordinates of the measuring point 3' are marked as (x 13 ,y13 , z 13 );

[0039] 4. Calculate the real coordinates of the mold erection point through the zero point coordinates, and then use the real-time observation value to make real-time corrections to the coordinates of the layout point;

[0040] The angle formed by its projection to the xoy plane and the y axis is denoted as β. Similarly, the angle formed by the spatial straight line formed by the measuring points 1' and 2' and the z axis is denoted as α', and the angle formed by its projection to the xoy plane and the y axis is denoted as β', then

[0041]

[0042]

[0043] Similarly, we can obtain sinα', cosα', sinβ' and cosβ'.

[0044] The distance between measuring point 3 and measuring point 1 is recorded as l, that is,

[0045]

[0046] The calculated coordinates of the mold erection point are:

[0047] z 03 =z 01 +l·cosα;x 03 =x 01 +l·sinα·sinβ;y 03 =y 01 +l·sinα·cosβ (1-6)

[0048] Assume that the distance between measuring point 3' and measuring point 1' is l', and l'=l, then the corrected coordinates of the stakeout point are:

[0049] z 13 =z 11 +l·cosα′;x 13 =x 11 +l·sinα'·sinβ';y 13 =y 11 +l·sinα'·cosβ' (1-7)

[0050] In order to facilitate practical application, the acquisition of zero-point coordinates is taken as the first observation unit; the coordinates of the two prism measuring points 1' and 2' measured during template layout are taken as the second observation unit, and the real coordinates of measuring point 3 are calculated by the zero-point coordinates, and then the coordinates of measuring point 3' are corrected in real time using the real coordinates of the template erection point as the correction unit, and the system is set to perform real-time calculation.

[0051] According to the above formula (1-7), the real-time position (x 13 ,y 13 , z 13 ), and then use the real-time position for layout. The present invention will effectively avoid the influence of temperature on the coordinates of the bridge tower column formwork, and there is no need to stop the layout work during the period of high temperature and other periods with greater temperature influence.

[0052] Embodiment 2:

[0053] The correction method and system described in the above-mentioned embodiment 1 are applied to the construction control of the cable tower of Jiayu Yangtze River Bridge:

[0054] In order to understand the displacement of the north cable tower of Jiayu Bridge under the influence of temperature, two prism measuring points were arranged on the middle tower column at a height of 85.1m from the pedestal for 24-hour observation. According to the temperature of the day, the temperature was relatively uniform around 5:00 a.m., and this time was taken as the "reference point". The displacement of the tower column is shown in Table 1, where △X represents the displacement along the bridge, △Y represents the displacement across the bridge, and △Z represents the deviation in the elevation direction.

[0055] Table 1 24-hour tower deviation

[0056]

[0057] As shown in Table 1 above, the tower column deflected greatly under the influence of temperature, with the maximum deflection △Y reaching 15.7mm, which occurred at around 14:30 in the afternoon. The elevation deviation △Z of point 1 is slightly larger than that of point 2. This is because point 1 is located higher than point 2 and deforms more under the action of temperature. The tower column's deflection △Y in the transverse direction is larger than △X in the longitudinal direction. This is because the transverse direction is east-west and is affected by the direct sunlight, resulting in a large temperature difference between the yin and yang sides of the tower column.

[0058] In the early stage of the construction of the tower column of the Jiayu Yangtze River Highway Bridge, the tracking prism method was not used to correct the coordinates of the vertical formwork. When the segment finished product was accepted, the maximum deviation in the transverse direction of the bridge reached 22mm, which exceeded the 10mm allowed by the specification and construction control. After applying the method in Example 1, the deviation of the tower was basically controlled within 10mm. Figure 3 shown.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers, characterized in that: The correction method comprises the following steps: (1) Installing a first prism and a second prism on the tower climbing formwork, and setting the two prisms to different heights; (2) Before adjusting the mold, observe the two prism points and set the measurement data at this time as the zero point coordinate. The measurement point of the first prism is measurement point 1, and the coordinates of measurement point 1 are marked as (x 01 ,y 01 , z 01 ), the measuring point of the second prism is measuring point 2, and the coordinates of measuring point 2 are marked as (x 02 ,y 02 , z 02 ); (3) When laying out the template, measure the two prisms. At this time, the measuring point of the first prism is measuring point 1', and the coordinates of measuring point 1' are marked as (x 11 ,y 11 , z 11 ), the measuring point of the second prism is measuring point 2', and the coordinates of measuring point 2' are marked as (x 12 ,y 12 , z 12 ); the stakeout point is measuring point 3', and the coordinates of measuring point 2' are marked as (x 13 ,y 13 , z 13 ); (4) The real coordinates of the mold erection point, i.e., measuring point 3, are calculated by the zero point coordinates as (x 03 ,y 03 , z 03 ), and then use the real coordinates of the mold erection point to correct the coordinates of the layout point in real time, and the corrected layout point coordinates are marked as (x 13 ,y 13 , z 13 ).

2. The method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers according to claim 1 is characterized in that: In the step (1), the height difference between the first prism and the second prism is 3-8m.

3. The method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers according to claim 1, characterized in that: The observation time in step (2) is 3:00-5:00 in the morning.

4. The method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers according to claim 1, characterized in that: The real coordinates (x 03 ,y 03 , z 03 ) is calculated as: z 03 =z 01 +l·cosα; x 03 =x 01 +l·sinα·sinβ; and 03 =and 01 +l·sinα·cosβ; Where l is the distance between measuring point 3 and measuring point 1, α is the angle between the spatial straight line formed by measuring points 1 and 2 and the z-axis; β is the angle between the projection of the straight line onto the xoy plane and the y-axis.

5. The method for correcting temperature deformation during the construction of cable-stayed bridge and suspension bridge towers according to claim 4 is characterized in that: The corrected stakeout point coordinates (x 13 ,y 13 , z 13 ) is calculated as: z 13 =z 11 +l·cosα′; x 13 =x 11 +l·sinα'·sinβ'; and 13 =and 11 +l·sinα'·cosβ'; Among them, α' is the angle formed by the spatial straight line formed by measuring point 1' and measuring point 2' and the z-axis; β' is the angle formed by the projection of the straight line onto the xoy plane and the y-axis.

6. The method for correcting temperature deformation during construction of cable-stayed bridge and suspension bridge towers according to claim 5, characterized in that: The angles are calculated as follows: Similarly, sinα', cosα', sinβ' and cosβ' can be calculated.

7. Temperature deformation correction system for cable-stayed bridge and suspension bridge tower construction process, characterized by: The temperature deformation correction system includes a first prism and a second prism installed on the tower climbing formwork with a height difference of 3-8m, as well as a first observation unit for observing the two prism points before preparing for mold adjustment, a second observation unit for observing when the template is laid out, and a correction unit for real-time correction of the coordinates of the final mold points.

8. The temperature deformation correction system for cable-stayed bridge and suspension bridge tower construction process according to claim 7 is characterized by: The first observation unit is used to observe two prism points before preparing for mold adjustment. The measurement point of the first prism is measurement point 1, and the coordinates of measurement point 1 are marked as (x 01 ,y 01 , z 01 ), the measuring point of the second prism is measuring point 2, and the coordinates of measuring point 2 are marked as (x 02 ,y 02 , z 02 ).

9. The temperature deformation correction system for cable-stayed bridge and suspension bridge tower construction process according to claim 7 is characterized by: When the second observation unit is used to lay out the template, two prisms are measured. At this time, the measuring point of the first prism is measuring point 1', and the coordinates of measuring point 1' are marked as (x 11 ,y 11 , z 11 ), the measuring point of the second prism is measuring point 2', and the coordinates of measuring point 2' are marked as (x 12 ,y 12 , z 12 ); the stakeout point is measuring point 3', and the coordinates of measuring point 3' are marked as (x 13 ,y 13 , z 13 ).

10. The temperature deformation correction system for cable-stayed bridge and suspension bridge tower construction process according to claim 7, characterized in that: The correction unit calculates the real coordinates of the mold erection point through the observation results of the first observation unit, and then uses the real coordinates of the mold erection point in combination with the second observation unit to perform real-time correction on the coordinates of the layout point.

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