CN115455771B - Deformation error control method caused by temperature effect in manufacturing of large-section steel box girder - Google Patents

Abstract

The invention proposes a deformation error control method caused by temperature effects in the manufacture of large-segment steel box girders, which belongs to the technical field of steel box girder manufacturing. The top and bottom plates are cut according to the longitudinal variation of each point of the top and bottom plates. ; According to the variation of the actual splicing temperature and the reference splicing temperature and the coefficient of linear expansion of the plates, determine the coordinates of the ends of the plates at the actual splicing temperature, and splice the plates according to the coordinates of the ends of the plates at the actual splicing temperature; According to the variation of the top crack and the bottom crack of the small-segment steel box girder contact end, determine the difference between the two, and correct the top plate size of the two adjacent small-segment steel box girder contact ends; The deformation errors in each step of the box girder manufacturing process are reasonably controlled separately, which reduces the influence of the ambient temperature and welding temperature in the manufacturing process of the large-segment steel box girder, and ensures the accuracy and speed of the large-segment steel box girder. manufacture.

Description

Control Method of Deformation Error Caused by Temperature Effect in Manufacture of Large Segment Steel Box Girder

technical field

The invention relates to the technical field of manufacturing steel box girders, in particular to a method for controlling deformation errors caused by temperature effects in the manufacturing of large-segment steel box girders.

Background technique

Steel box girders are widely used in long-span steel bridges because of their light weight, high bearing capacity, and convenient construction. There are many construction methods for steel box girder bridges, among which the large segment hoisting method has the advantages of fast construction speed, high construction quality and safety, and is especially suitable for super-large bridges crossing rivers and seas. The large-segment hoisting construction method means that after the prefabrication of the small steel box girder sections is completed, the entire span of the large section is directly assembled in the factory, and after being transported to the bridge site by transport vehicles or ships, large spreaders such as floating cranes are used. Lift the whole steel box girder directly to the design position.

During the manufacturing process of large-segment steel box girders, it is difficult to accurately calculate the deformation caused by the ambient temperature and welding temperature effect, which will cause manufacturing errors, and there is no accurate calculation and control method at present. In addition, once the girth welding between the girder sections is completed after the hoisting of the large-segment steel box girder, the final state of the bridge has been determined, and it will be difficult to effectively adjust the internal force and alignment afterwards. Therefore, reasonable and effective control of the deformation error caused by the temperature effect in the manufacturing process of large-segment steel box girders is the main measure to ensure the rationality of the bridge alignment and internal force state.

Contents of the invention

The purpose of the present invention is to provide a deformation error control method caused by temperature effects in the manufacture of large-section steel box girders, which reduces the influence caused by the ambient temperature and welding temperature during the manufacture of large-section steel box girders, and ensures that the large-section steel box girder Precise and rapid manufacturing of box girders.

To achieve the above object, the present invention provides the following scheme:

A method for controlling deformation errors caused by temperature effects in the manufacture of large-segment steel box girders. The large-segment steel box girder is composed of several small-segment steel box girders welded, and the small-segment steel box girder is composed of several plates spliced together. The plurality of plates include a top plate and a bottom plate; the surface of the top plate and the surface of the bottom plate need to be welded with several U-shaped ribs; the deformation error control method includes the following steps:

Perform finite element analysis on the model of the top plate and the model of the bottom plate in the U-shaped rib welding state, and determine the simulated longitudinal variation of each point in the transverse direction of the top plate and the U-shaped rib in the U-shaped rib welding state. The simulated longitudinal variation of each point in the transverse direction of the bottom plate in the welded state; the simulated longitudinal variation is the variation of the plate in the extending direction of the U-shaped rib; the transverse direction is perpendicular to the extending direction of the U-shaped rib the direction of

According to the simulated longitudinal variation of each point in the transverse direction of the top plate in the U-shaped rib welding state and the simulated longitudinal change of each point in the transverse direction of the bottom plate in the U-shaped rib welding state, determine the longitudinal dimension of the top plate and the The longitudinal dimension of the bottom plate obtains the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate; the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate are respectively used to guide the actual alignment of the top cutting of the panels and the bottom panel so that the longitudinal dimension of the top panel or the bottom panel reaches a preset size after the U-shaped rib welding is completed;

For any sheet, according to the size of the sheet at the reference splicing temperature, the linear expansion coefficient of the sheet, and the variation between the actual splicing temperature and the reference splicing temperature, determine the dimensional change of the sheet at the actual splicing temperature, Obtain the simulated dimensional variation of the plate;

According to the simulated dimensional change of the plates, determine the coordinates of the ends of the plates at the actual splicing temperature to obtain the simulated coordinates of the ends of the plates; the simulated coordinates of the ends of the plates are used to carry out Guide the position of the end of the board during splicing, so that the end of the board can be accurately spliced with the starting point of the next board;

Establish the finite element model under the welding state of two adjacent small-segment steel box girders, and conduct finite element analysis according to the actual welding process to determine the variation of the top crack and the bottom crack between the two small-segment steel box girders , to obtain the simulated top crack variation and the simulated bottom crack variation between the two small-segment steel box girders;

According to the variation of the simulated top gap and the simulated bottom gap variation, the difference between the simulated top gap variation and the simulated bottom gap variation is determined to obtain the simulated gap variation difference;

According to the difference in the variation of the simulated crack, the size of the top plate at the contact end of the two small section steel box girders is corrected to obtain the simulated top plate size of the two small section steel box girders; the small section The simulated top plate size of the steel box girder is used to guide the cutting of the small-segment steel box girder, so that the length of the top plate in the small-segment steel box girder after actual welding is the same as the length of the bottom plate.

Optionally, the following formula is used to determine the simulated longitudinal variation of each point in the transverse direction of the top plate:

Wherein, f(x) is the simulated longitudinal variation distribution of each point in the transverse direction of the top plate, x is any point in the transverse direction of the top plate, a is the transverse interval of the U-shaped rib, A ₀ , A ₁ , A ₂ , A ₃ , B ₀ , B ₁ , B ₂ , B ₃ , C ₀ , C ₁ , C ₂ , and C ₃ are the fitting coefficients; The central lines of the U-shaped ribs are distributed symmetrically.

Optionally, the top plate is determined according to the simulated longitudinal variation of each point in the transverse direction of the top plate in the U-shaped rib welding state and the simulated longitudinal change of each point in the transverse direction of the bottom plate in the U-shaped rib welding state and the longitudinal dimension of the bottom plate to obtain the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate, specifically comprising:

If the simulated longitudinal variation of each point in the transverse direction of the top plate in the U-shaped rib welding state is z, then before performing U-shaped rib welding on the top plate, the longitudinal dimension of the top plate is shortened by z to obtain the simulated longitudinal dimension of the top sheet;

If the simulated longitudinal variation of each point in the transverse direction of the top plate under the U-shaped rib welding state is -z, then before performing U-shaped rib welding on the top plate, the longitudinal dimension of the top plate is extended by z to obtain the simulated longitudinal dimension of the top plate;

If the simulated longitudinal variation of each point of the bottom plate in the U-shaped rib welding state is z ₁ , before performing U-shaped rib welding on the bottom plate, the longitudinal dimension of the bottom plate is shortened by z ₁ to obtain the simulated longitudinal dimension of said bottom panel;

If the simulated longitudinal variation of each point of the bottom plate in the U-shaped rib welding state is -z ₁ , before performing U-shaped rib welding on the bottom plate, the longitudinal dimension of the bottom plate is extended by z ₁ , The simulated longitudinal dimension of the bottom panel is obtained.

Optionally, the dimensional change of the plates at the actual splicing temperature is determined according to the following formula:

Δl=αΔTl

Wherein, Δl is the dimensional change of the plate at the actual splicing temperature, α is the linear expansion coefficient of the plate, ΔT is the temperature change between the reference splicing temperature and the actual splicing temperature, l is the The size of the boards at the reference splicing temperature.

Optionally, the amount of coordinate change at the end of the plate at the actual splicing temperature is determined according to the following formula:

Δx=Δl cosβ

Δy=Δl sinβ

Among them, Δx is the x-axis coordinate change of the end of the plate at the actual splicing temperature, Δy is the y-axis coordinate change of the end of the plate at the actual splicing temperature, and Δl is the change in the actual splicing temperature of the plate The simulated dimensional change under temperature, β is the placement angle of the plate.

Optionally, the gap variation difference is determined according to the following formula:

δ＝δ _top -δ _bottom

Among them, δ _top is the variation of the simulated top crack, δ _bottom is the variation of the simulated bottom crack, and δ is the difference of the crack variation.

Optionally, the size of the top plate at the contact end of the two small-segment steel box girders is corrected according to the difference in the variation of the simulated crack to obtain the respective simulated top plates of the two small-segment steel box girders Dimensions, including:

For any small-segment steel box girder, the size of the top plate at the contact end of the small-segment steel box girder and another small-segment steel box girder is shortened by δ to obtain the respective simulated top plate sizes of the two small-segment steel box girders.

Optionally, the size of the top plate at the contact end of the two small-segment steel box girders is corrected according to the difference in the variation of the simulated crack to obtain the respective simulated top plates of the two small-segment steel box girders Dimensions, including:

The dimensions of the top plates at the contact ends of the two small-segment steel box girders are respectively shortened by δ/2 to obtain the simulated top plate sizes of the two small-segment steel box girders.

Corresponding to the aforementioned deformation error control method, the present invention also provides a deformation error control system caused by temperature effects in the manufacture of large-segment steel box girders. When the deformation error control system is run by a computer, it executes the large A control method for deformation errors caused by temperature effects in the manufacture of segmental steel box girders.

According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

The method for controlling deformation errors caused by temperature effects in the manufacture of large-segment steel box girders provided by the present invention firstly performs U-shaped rib welding on the surface of the top plate and the bottom plate, according to the longitudinal variation of each point of the top plate and the bottom plate respectively For the longitudinal variation of each point, cut the top plate and the bottom plate to ensure that after the U-shaped rib is welded, there will not be too much error at the contact end with other plates; secondly, in the process of splicing the plates, according to the actual The variation of the splicing temperature and the reference splicing temperature and the linear expansion coefficient of the plates are determined to determine the length change of each plate at the actual splicing temperature and the coordinates of the ends of the plates, and the splicing of the plates is carried out according to the coordinates of the plates at the actual splicing temperature. Stitching of the coordinates designed at the reference splicing temperature will be affected by the ambient temperature and there will be splicing errors; finally, when welding each small-segment steel box girder into a large-segment steel box girder, according to the change of the top crack of the contact end and the change of the bottom crack To determine the difference between the two and keep the bottom plate unchanged, correct the size of the top plate at the contact end of two adjacent small-segment steel box girders to avoid the The large-segment steel box girder deviates from the manufacturing line shape with the splicing length due to the difference in the welding process and welding workload of the bottom plate; through the above-mentioned deformation errors in each step of the large-segment steel box girder manufacturing process, respectively Reasonable control reduces the influence of ambient temperature and welding temperature in the manufacturing process of large-segment steel box girders, and ensures the precise and rapid manufacture of large-segment steel box girders.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the flow chart of the deformation error control method caused by the temperature effect in the manufacture of large section steel box girder provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of a steel box girder in the deformation error control method provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a large section steel box girder in the deformation error control method provided by Embodiment 1 of the present invention;

4 is a cross-sectional view of U-shaped rib welding in the deformation error control method provided in Embodiment 1 of the present invention;

5 is a top view of U-shaped rib welding in the deformation error control method provided by Embodiment 1 of the present invention;

Fig. 6 is a schematic diagram of the deformation of the plate caused by the ambient temperature in the deformation error control method provided by Embodiment 1 of the present invention;

Fig. 7 is a schematic diagram of deformation generated during welding between small-segment steel box girders in the deformation error control method provided by Embodiment 1 of the present invention;

Fig. 8 is a schematic structural diagram of a deformation error control system caused by temperature effects in the manufacture of large-segment steel box girders provided by Embodiment 2 of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a deformation error control method caused by temperature effects in the manufacture of large-section steel box girders, which reduces the influence caused by the ambient temperature and welding temperature during the manufacture of large-section steel box girders, and ensures that the large-section steel box girder Precise and rapid manufacturing of box girders.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

This embodiment provides a deformation error control method caused by temperature effects in the manufacture of large-segment steel box girders, as shown in the flow chart in Figure 1, the deformation error control method includes the following steps:

The large-segment steel box girder is composed of several small-segment steel box girders welded together, as shown in Figure 2, where each segment belongs to a small-segment steel box girder, and multiple small-segment steel box girders together form a large-segment steel box girder; as shown in Figure 3, the small-segment steel box girder is composed of several plates spliced together, including the top plate and the bottom plate; the surface of the top plate and the surface of the bottom plate need to be welded with several U Shaped ribs; the top and bottom plates that make up the small-segment steel box girder are U-rib stiffeners, and U-shaped ribs need to be welded on the surface of the plates.

As shown in Figure 4 and Figure 5, the temperature effect during the welding process of the U-shaped rib and the top and bottom plates will cause the longitudinal deformation of the top and bottom plates. The longitudinal deformation of the top and bottom plates of the section steel box girder caused by the welding temperature effect, and then the longitudinal deformation is reversely considered in the cutting size of the top and bottom plates of the steel box girder, so as to offset the longitudinal deformation caused by the welding temperature effect .

S1. Through finite element analysis, determine the simulated longitudinal variation of each point in the transverse direction of the plate;

The finite element analysis of the model of the top plate and the model of the bottom plate under the U-shaped rib welding state is carried out respectively, and the simulated longitudinal variation of each point in the transverse direction of the top plate under the U-shaped rib welding state and the transverse direction of the bottom plate under the U-shaped rib welding state are determined. The simulated longitudinal change of each point; the simulated longitudinal change is the change of the plate in the extending direction of the U-shaped rib; the transverse direction is the direction perpendicular to the extending direction of the U-shaped rib;

Specifically in this embodiment, the following formula is used to determine the simulated longitudinal variation of each point in the transverse direction of the top plate:

Wherein, f(x) is the simulated longitudinal variation distribution of each point in the transverse direction of the top plate, x is any point in the transverse direction of the top plate, a is the transverse interval of the U-shaped rib, A ₀ , A ₁ , A ₂ , A ₃ , B ₀ , B ₁ , B ₂ , B ₃ , C ₀ , C ₁ , C ₂ , and C ₃ are the fitting coefficients; The central lines of the U-shaped ribs are distributed symmetrically.

The above formula for determining the simulated longitudinal variation of each point in the transverse direction of the top plate is to establish a U-shaped rib welding finite element model based on the actual welding process of the top and bottom plates of the small-segment steel box girder. After the analysis of the welding process is completed, the top plate is extracted The longitudinal non-uniform deformation of the roof and the bottom plate are calculated by fitting the piecewise cubic polynomial.

S2. Determine the simulated longitudinal size of the plate according to the simulated longitudinal variation of each point in the transverse direction of the plate;

According to the simulated longitudinal variation of each point in the transverse direction of the top plate in the state of U-shaped rib welding and the simulated longitudinal change of each point in the transverse direction of the bottom plate in the state of U-shaped rib welding, the longitudinal dimension of the top plate and the longitudinal dimension of the bottom plate are determined, and the obtained The simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate, so that the longitudinal dimension of the top plate or the bottom plate reaches a preset size after the U-shaped rib welding is completed; the simulated longitudinal dimension of the top plate and The simulated longitudinal dimensions of the bottom sheet are respectively used to guide the actual cutting of the top sheet and the bottom sheet; in this embodiment, step S2 specifically includes:

S21. If the simulated longitudinal variation of each point of the top plate in the U-shaped rib welding state is z, then before performing U-shaped rib welding on the top plate, the longitudinal dimension of the top plate is shortened by z to obtain the simulated longitudinal dimension of said top panel;

S22. If the simulated longitudinal variation of each point of the top plate in the U-shaped rib welding state is -z, then before performing U-shaped rib welding on the top plate, extend the longitudinal dimension of the top plate by z, obtaining the simulated longitudinal dimension of the top panel;

S23. If the simulated longitudinal variation of each point of the bottom plate in the U-shaped rib welding state is z ₁ , shorten the longitudinal dimension of the bottom plate by z ₁ before performing U-shaped rib welding on the bottom plate , to obtain the simulated longitudinal dimension of the bottom plate;

S24. If the simulated longitudinal variation of each point of the bottom plate in the U-shaped rib welding state is -z ₁ , then before performing U-shaped rib welding on the bottom plate, extend the longitudinal dimension of the bottom plate by z ₁ , to obtain the simulated longitudinal dimension of the bottom plate.

S3. Guide the actual cutting and U-shaped rib welding process according to the simulated longitudinal size of the plate;

According to the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate, the top plate and the bottom plate are actually cut and welded with U-shaped ribs respectively to obtain the welded top plate and the welded bottom plate;

When splicing multiple plates to form a small-segment steel box girder, as shown in Figure 6, the temperature of the assembly environment may cause the corresponding expansion and deformation of the plates, which will cause displacement of the ends of the plates that need to be connected. Therefore, it is necessary Correct this error condition.

S4. Determine the simulated dimensional change of the plates at the actual splicing temperature;

For any plate, according to the size of the plate at the reference splicing temperature, the linear expansion coefficient of the plate, and the change between the actual splicing temperature and the reference splicing temperature, determine the dimensional change of the plate at the actual splicing temperature, and obtain the simulated dimensional change of the plate amount; in the present embodiment, according to the following formula, determine the dimensional variation of the plate under the actual splicing temperature:

Δl=αΔTl

Wherein, Δl is the dimensional change of the plate at the actual splicing temperature, α is the linear expansion coefficient of the plate, ΔT is the temperature change between the reference splicing temperature and the actual splicing temperature, l is the The size of the boards at the reference splicing temperature.

Another way is to determine the steel specimen with the same material as the steel box girder and whose length is l ₁ at the reference temperature, measure the length change Δl ₁ of the steel specimen at the current ambient temperature, and then calculate the actual steel specimen according to the following formula Dimensional change of box girder plate:

S5. Determine the simulated coordinates of the ends of the plates at the actual splicing temperature;

According to the simulated size change of the plate, determine the coordinates of the end of the plate at the actual splicing temperature, and obtain the simulated coordinates of the end of the plate, so that the end of the plate can be accurately spliced with the starting point of the next plate; the simulated coordinates of the end of the plate are used In order to guide the position of the ends of the plates when splicing the plates; guide the splicing process of the plates according to the simulated coordinates of the ends of the plates at the actual splicing temperature, and obtain several small section steel box girders; in this embodiment, first Determine the simulated coordinate change at the end of the plate at the actual splicing temperature according to the following formula:

Δx=Δl cosβ

Δy=Δl sinβ

Wherein, Δx is the simulated x-axis coordinate variation of the end of the sheet at the actual splicing temperature, Δy is the simulated y-axis coordinate variation of the sheet end at the actual splicing temperature, and Δl is the variation of the sheet at the The simulated dimensional change at the actual splicing temperature, β is the placement angle of the plates;

Then, according to the simulated coordinate variation of the plate end at the actual splicing temperature and the coordinates of the plate end at the reference splicing temperature, the simulated coordinates of the plate end at the actual splicing temperature are determined.

After determining the simulation coordinates of the end of the plate at the actual splicing temperature, the specific control measures are as follows: when positioning on the tire frame, correct the positioning coordinates of the small-segment steel box girder manufacturing length change caused by the deviation between the ambient temperature and the design reference temperature, Then carry out the stakeout operation according to the coordinate value after correcting the temperature difference.

When manufacturing large-segment steel box girders, due to the different girth welding procedures and workload of small-segment steel box girders, the weld shrinkage of the top plate and bottom plate at the contact end of small-segment steel box girders will be different. As shown in Figure 7, the shrinkage of the welding seam causes the deviation of the end face angle of the steel box girder of the small section, and then changes the horizontal angle difference of the adjacent sections. The length deviates more and more from the manufacturing line. If the height of the small-segment steel box girder is h, when the shrinkage difference between the top and bottom plate welds is δ, it will cause a (-δ/h) rad angle difference in assembly. At this time, the small-segment steel with length L The end elevation of the box girder will be δL/h lower than the theoretical value. Therefore, it is necessary to control the possible deformation errors before assembling and welding the small-segment steel box girder.

S6. Through finite element analysis, determine the variation of the simulated top crack and the simulated bottom crack when the two small-section steel box girders are welded;

Establish the finite element model of two adjacent small-segment steel box girders in the welding state, conduct finite element analysis according to the actual welding process, and determine the variation of the top and bottom cracks between the two small-segment steel box girders, and obtain The variation of the simulated top crack and the simulated bottom crack between the two small section steel box girders;

S7. According to the variation of the simulated top gap and the simulated bottom gap variation, determine the difference between the simulated top gap variation and the simulated bottom gap variation, and obtain the simulated gap variation difference; in this embodiment, determine the gap variation according to the following formula Quantity difference:

δ＝δ _top -δ _bottom

Among them, δ _top is the variation of the simulated top crack, δ _bottom is the variation of the simulated bottom crack, and δ is the difference of the crack variation.

Since the width of the top plate in the small-section steel box girder is usually greater than that of the bottom plate, in actual welding, the welding work on the edge of the top plate of the small-section steel box girder will be greater than that on the edge of the bottom plate, so The deformation of the top plate of the small-segment steel box girder is greater than the deformation of the bottom plate of the small-segment steel box girder. At this time, it is necessary to shorten the size of the top plate of the small-segment steel box girder that is in contact.

S8. Determine the size of the top plate of the two small-segment steel box girders according to the difference in the variation of the simulated crack, and guide the welding and assembly process;

According to the difference in the variation of the simulated crack, the size of the top plate at the contact end of the two small-section steel box girders is corrected to obtain the simulated top plate size of the two small-section steel box girders, so that the actual welded small section The length of the top plate in the segment steel box girder is the same as that of the bottom plate, and the welding assembly process of the small segment steel box girder is carried out. In this embodiment, step S8 specifically includes: for any small-segment steel box girder, shortening the size of the top plate at the contact end between the small-segment steel box girder and another small-segment steel box girder by δ.

As another achievable technical solution, step S8 may be specifically: shorten the dimensions of the top plates at the contact ends of the two small-segment steel box girders by δ/2 respectively.

In addition, the welding of inner girth seams of large-segment steel box girders should follow the following principles:

First, the butt welds of the top plate, bottom plate, and inclined bottom plate are symmetrically welded from the middle to both ends; second, the butt welds of the middle web, side web, and side sealing plate are symmetrically welded from bottom to top; third, the same type of plates The welds are symmetrically welded.

And during the assembly process of large-segment steel box girders, mark measuring points at the two ends of the welding seam of adjacent small-segment steel box girders, and measure the distance between the measuring points before welding and after the welding deformation is stable by using a steel ruler. Change amount, collect data on weld shrinkage of roof and bottom plates after the first round of large-section steel box girder welding deformation is stable, to verify the effect of welding process on weld shrinkage control.

In this embodiment, firstly, when U-shaped rib welding is performed on the surface of the top plate and the bottom plate, the top plate and the bottom plate are cut according to the longitudinal variation of each point of the top plate and the longitudinal variation of each point of the bottom plate, It is guaranteed that after the U-shaped rib is welded, there will not be too much error at the contact end with other plates.

Secondly, in the process of splicing each plate, the length change of each plate at the actual splicing temperature and the coordinates of the end of the plate are determined according to the change of the actual splicing temperature and the reference splicing temperature and the linear expansion coefficient of the plate. The plate coordinates at the splicing temperature are used to splice the plates to avoid splicing errors that may be affected by the ambient temperature when splicing according to the coordinates designed at the reference splicing temperature.

Finally, when welding each small-segment steel box girder into a large-segment steel box girder, according to the variation of the top and bottom cracks at the contact end, determine the difference between the two, and keep the bottom plate unchanged. The size of the top plate at the contact end of two adjacent small-segment steel box girders is corrected to avoid the large-segment steel box Splice lengths increasingly deviate from manufacturing alignment.

Through the reasonable control of the deformation error in each step in the manufacturing process of the large-segment steel box girder, the influence of the ambient temperature and welding temperature in the manufacturing process of the large-segment steel box girder is reduced, and the large-segment steel box girder is guaranteed. Precise and rapid manufacturing of segmental steel box girders.

Example 2:

The method of Embodiment 1 of the present invention can also be realized by means of the structure of the deformation error control system caused by temperature effect in the manufacture of large-segment steel box girder shown in FIG. 8 . As shown in Figure 8, the deformation error control system may include: a U-shaped rib welding error correction module, a plate splicing error correction module and a steel box girder welding error correction module; some modules may also have subunits for realizing their functions, such as The U-shaped rib welding error correction module includes the simulated longitudinal variation determination unit and the simulated longitudinal dimension determination unit; the plate splicing error correction module includes the simulated size determination unit and the simulated coordinate determination unit; the steel box girder welding correction module includes The gap variation determination unit and the gap variation difference determination unit. Of course, the architecture shown in FIG. 8 is only exemplary. In some implementations, other units can be added to some modules; in addition, when different functions need to be implemented, the architecture shown in FIG. 8 can also be omitted according to actual needs. One or at least two components in a system.

Concrete examples are used in this paper, but the above description only sets forth the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the method of the present invention and its core idea; those skilled in the art should understand Each module or each step of the above-mentioned present invention can be realized by a general-purpose computer device, and optionally, they can be realized by a program code executable by the computing device, so that they can be stored in a storage device and executed by the computing device Execute, or make them into individual integrated circuit modules, or make multiple modules or steps among them into a single integrated circuit module to realize. The invention is not limited to any specific combination of hardware and software.

At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. A method for controlling deformation errors caused by temperature effects in the manufacture of large-segment steel box girders. The large-segment steel box girder is composed of several small-segment steel box girders welded, and the small-segment steel box girder is composed of several plates spliced together , including a top plate and a bottom plate in the plurality of plates; the surface of the top plate and the surface of the bottom plate all need to weld several U-shaped ribs; it is characterized in that the deformation error control method includes: Perform finite element analysis on the model of the top plate and the model of the bottom plate in the U-shaped rib welding state, and determine the simulated longitudinal variation of each point in the transverse direction of the top plate and the U-shaped rib in the U-shaped rib welding state. The simulated longitudinal variation of each point in the transverse direction of the bottom plate in the welded state; the simulated longitudinal variation is the variation of the plate in the extending direction of the U-shaped rib; the transverse direction is perpendicular to the extending direction of the U-shaped rib the direction of According to the simulated longitudinal variation of each point in the transverse direction of the top plate in the U-shaped rib welding state and the simulated longitudinal change of each point in the transverse direction of the bottom plate in the U-shaped rib welding state, determine the longitudinal dimension of the top plate and the The longitudinal dimension of the bottom plate obtains the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate; the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate are respectively used to guide the actual alignment of the top cutting of the panels and the bottom panel so that the longitudinal dimension of the top panel or the bottom panel reaches a preset size after the U-shaped rib welding is completed; For any sheet, according to the size of the sheet at the reference splicing temperature, the linear expansion coefficient of the sheet, and the variation between the actual splicing temperature and the reference splicing temperature, determine the dimensional change of the sheet at the actual splicing temperature, Obtain the simulated dimensional variation of the plate; According to the simulated dimensional change of the plates, determine the coordinate change of the ends of the plates at the actual splicing temperature, and then according to the coordinate changes of the ends of the plates at the actual splicing temperature and the reference splicing temperature The coordinates of the ends of the plates are used to obtain the simulated coordinates of the ends of the plates at the actual splicing temperature; the simulated coordinates of the ends of the plates are used to guide the position of the ends of the plates when the plates are spliced, so that The end of the plate is accurately spliced with the starting point of the next plate; Establish the finite element model under the welding state of two adjacent small-segment steel box girders, and conduct finite element analysis according to the actual welding process to determine the variation of the top crack and the bottom crack between the two small-segment steel box girders , to obtain the simulated top crack variation and the simulated bottom crack variation between the two small-segment steel box girders; According to the variation of the simulated top gap and the simulated bottom gap variation, the difference between the simulated top gap variation and the simulated bottom gap variation is determined to obtain the simulated gap variation difference; According to the difference in the variation of the simulated crack, the size of the top plate at the contact end of the two small section steel box girders is corrected to obtain the simulated top plate size of the two small section steel box girders; the small section The simulated top plate size of the steel box girder is used to guide the cutting of the small-segment steel box girder, so that the length of the top plate in the small-segment steel box girder after actual welding is the same as the length of the bottom plate. 2. deformation error control method according to claim 1, is characterized in that, adopts following formula to determine the simulated longitudinal variation of each point in the lateral direction of the top plate:

Wherein, f(x) is the simulated longitudinal variation distribution of each point in the transverse direction of the top plate, x is any point in the transverse direction of the top plate, a is the transverse interval of the U-shaped rib, A ₀ , A ₁ , A ₂ , A ₃ , B ₀ , B ₁ , B ₂ , B ₃ , C ₀ , C ₁ , C ₂ , and C ₃ are the fitting coefficients; The central lines of the U-shaped ribs are distributed symmetrically. 3. The deformation error control method according to claim 1, characterized in that, according to the simulated longitudinal variation of each point in the transverse direction of the top plate under the U-shaped rib welding state and the bottom plate under the U-shaped rib welding state The simulated longitudinal variation of each point in the horizontal direction, determine the longitudinal dimension of the top plate and the longitudinal dimension of the bottom plate, and obtain the simulated longitudinal dimension of the top plate and the simulated longitudinal dimension of the bottom plate, specifically including: If the simulated longitudinal variation of each point in the transverse direction of the top plate in the U-shaped rib welding state is z, then before performing U-shaped rib welding on the top plate, the longitudinal dimension of the top plate is shortened by z to obtain the simulated longitudinal dimension of the top sheet; If the simulated longitudinal variation of each point in the transverse direction of the top plate under the U-shaped rib welding state is -z, then before performing U-shaped rib welding on the top plate, the longitudinal dimension of the top plate is extended by z to obtain the simulated longitudinal dimension of the top plate; If the simulated longitudinal variation of each point of the bottom plate in the U-shaped rib welding state is z ₁ , before performing U-shaped rib welding on the bottom plate, the longitudinal dimension of the bottom plate is shortened by z ₁ to obtain the simulated longitudinal dimension of said bottom panel; If the simulated longitudinal variation of each point in the transverse direction of the bottom plate in the U-shaped rib welding state is -z1, then before performing U-shaped rib welding on the bottom plate, the longitudinal dimension of the bottom plate is extended by z ₁ , to obtain The simulated longitudinal dimension of the bottom sheet. 4. deformation error control method according to claim 1, is characterized in that, according to the following formula, determine the dimensional variation of the plate under the actual splicing temperature: Δl=αΔTl Wherein, Δl is the dimensional change of the plate at the actual splicing temperature, α is the linear expansion coefficient of the plate, ΔT is the temperature change between the reference splicing temperature and the actual splicing temperature, l is the The size of the boards at the reference splicing temperature. 5. deformation error control method according to claim 1, is characterized in that, according to the following formula, determine the coordinate variation of the end of the plate under the actual splicing temperature: Δx=Δlcosβ Δy=Δlsinβ Among them, Δx is the x-axis coordinate change of the end of the plate at the actual splicing temperature, Δy is the y-axis coordinate change of the end of the plate at the actual splicing temperature, and Δl is the change in the actual splicing temperature of the plate Dimensional change under temperature, β is the placement angle of the board. 6. The deformation error control method according to claim 1, characterized in that, the gap variation difference is determined according to the following formula: δ＝δ _top -δ _bottom Among them, δ _top is the variation of the simulated top crack, δ _bottom is the variation of the simulated bottom crack, and δ is the difference of the crack variation. 7. The deformation error control method according to claim 6, characterized in that, according to the difference in variation of the simulated crack, the size of the top plate at the contact end of the two small section steel box girders is corrected to obtain The respective simulated top plate dimensions of the two small-segment steel box girders include: For any small-segment steel box girder, the size of the top plate at the contact end of the small-segment steel box girder and another small-segment steel box girder is shortened by δ to obtain the respective simulated top plate sizes of the two small-segment steel box girders. 8. The deformation error control method according to claim 6, characterized in that, according to the difference in variation of the simulated crack, the size of the top plate at the contact end of the two small section steel box girders is corrected to obtain The respective simulated top plate dimensions of the two small-segment steel box girders include: The dimensions of the top plates at the contact ends of the two small-segment steel box girders are respectively shortened by δ/2 to obtain the simulated top plate sizes of the two small-segment steel box girders.

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