A processing method for a small box girder without axial force for bridge
By obtaining the reference surface of the small box girder and performing end-face milling, the problem of the parallelism and perpendicularity of the small box girder after assembly is solved, and the accuracy and coordination after splicing are significantly improved.
Patent Information
- Application Number
- CN202211413416.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-11
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2042-11-11
AI Technical Summary
The parallelism and perpendicularity of the assembled small box girders are likely to not meet the usage requirements, resulting in a decrease in the fit with the box girders.
By obtaining the first horizontal reference plane and the first vertical reference plane of the small box girder, the end surface processing amount of each box girder segment is obtained, and the end surfaces of the box girder segments are milled according to these reference planes to ensure that the spliced small box girder meets the flatness and verticality requirements.
The flatness deviation and verticality deviation of the small box girder after splicing are significantly reduced, the accuracy of the pad is improved, and the small box girder meets the requirements of bridge construction during application.
Smart Images
Figure CN115592174B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of small box girder processing, and in particular relates to a processing method of a small axial force-free box girder for a bridge. Background Art
[0002] Small box girders are arranged between adjacent box girders to reduce the stress of the bridge and improve the ability of the bridge to maintain strength when coping with external forces. Due to the limitations of transport vehicles and lines, small box girders are composed of multiple box girder segments, which are disassembled during transportation. After the multiple box girder segments arrive at the installation point, the box girder segments are spliced to form a small box girder. This can easily lead to the parallelism and verticality of the spliced small box girder failing to meet the use requirements, and the degree of fit between the small box girder and the box girder becomes low. Summary of the invention
[0003] The present application aims to at least to some extent solve the technical problem that the parallelism and verticality of the assembled small box beams are apt to fail to meet the use requirements. To this end, the present application provides a method for processing an axial force-free small box beam for a bridge.
[0004] The technical solution of this application is as follows:
[0005] A method for processing a small box girder without axial force for a bridge comprises the following steps:
[0006] Providing more than two box beam segments, and sequentially connecting the more than two box beam segments into a small box beam;
[0007] Acquire a first horizontal reference plane and a first vertical reference plane of the small box girder;
[0008] Obtaining the end surface machining amount of each box beam segment and depicting the end surface machining line according to the obtained first horizontal reference plane and the first vertical reference plane;
[0009] Dismantle two or more of the box beam segments in sequence, and mill the end faces of the box beam segments according to the end face machining lines;
[0010] Connecting the milled box beam segments in sequence into small box beams, and aligning them according to the first horizontal reference plane and the first vertical reference plane;
[0011] The pad of the outer wall of the small box beam is milled to a target size.
[0012] In some implementations, the step of acquiring the first horizontal reference plane and the first vertical reference plane includes:
[0013] Obtaining the center axes of the end faces at opposite ends of the small box beam, obtaining a plane through the two center axes, and leveling the plane to obtain a first horizontal reference plane;
[0014] The midpoints of the top ridges of the end faces at the opposite ends of the small box girder are obtained, a vertical line is obtained through a plumb bob, and a vertical reference plane is obtained through two vertical lines.
[0015] In some implementations, the step of obtaining the first horizontal reference plane and the first vertical reference plane of the small box beam further includes:
[0016] The outer wall of the small box girder is engraved to connect it with the first horizontal reference plane and the vertical reference plane.
[0017] In some embodiments, the step of milling the end surface of the box beam segment comprises:
[0018] Rough milling the end face of the box beam segment according to the end face machining line;
[0019] Acquire a second vertical reference plane of the box girder segment after rough milling;
[0020] The box girder segment is precision milled according to the obtained second vertical reference plane.
[0021] In some embodiments, the second vertical reference plane is perpendicular to the first horizontal reference plane and the first vertical reference plane.
[0022] In some embodiments, the step of milling the backing plate of the outer wall of the small box beam to a target size comprises:
[0023] After rough milling the pads of the outer wall of the small box beam, the flatness deviation and verticality deviation of each pad are obtained;
[0024] According to the obtained flatness deviation and verticality deviation, the pad of the outer wall of the small box beam is finely milled.
[0025] In some embodiments, the steps of rough milling the backing plate of the outer wall of the small box beam and the steps of fine milling the backing plate of the outer wall of the small box beam both include:
[0026] Milling the top surface and a side pad of the small box beam to a target size;
[0027] The small box beam is turned over so that the top surface of the small box beam faces downward, and the pads on the remaining two outer walls of the small box beam are milled to a target size.
[0028] In some embodiments, in the step of flipping the small box girder, the third horizontal reference plane and the third vertical reference plane of the flipped small box girder are obtained, and the small box girder is adjusted so that the third horizontal reference plane and the third vertical reference plane coincide with each other.
[0029] In some embodiments, a numerically controlled hydraulic support adjustment system is provided, and the numerically controlled hydraulic support adjustment system can rotate and move the small box beam to obtain the first horizontal reference plane and the first vertical reference plane.
[0030] In some embodiments, a laser tracking measuring instrument is provided, through which the shape data of the small box girder is acquired.
[0031] The embodiments of the present application have at least the following beneficial effects:
[0032] It can be seen from the above technical scheme that the processing method disclosed in the present application uses the small box girder as a reference to obtain the first horizontal reference plane and the first vertical reference plane, mills the end face of the box girder segment, and mills the excess of the single box girder segment that cannot meet the straightness requirements and verticality requirements compared to the first horizontal reference plane and the first vertical reference plane. After the milled box girder segments are spliced together according to the previous connection order, the straightness deviation and verticality deviation of the small box girder will be significantly reduced. On this basis, the pad is processed again, which can effectively improve the accuracy of the pad on the spliced small box girder, reduce the straightness deviation, verticality deviation and parallelism deviation of the pad, and thereby make the straightness and verticality of the small box girder meet the requirements of bridge construction during the application process. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0034] Figure 1 A schematic diagram of the process of the processing method in the embodiment of the present application is shown;
[0035] Figure 2 A schematic diagram of the installation structure of a small box beam in an embodiment of the present application is shown;
[0036] Figure 3 A schematic diagram showing a first horizontal reference plane and a first vertical reference plane in an embodiment of the present application is shown;
[0037] Figure 4 A schematic diagram of the structure of a numerically controlled hydraulic support adjustment system in an embodiment of the present application is shown;
[0038] Figure 5 A measurement schematic diagram of a laser tracking measuring instrument in an embodiment of the present application is shown;
[0039] Markings in the figure: 1- small box girder, 2- pad, 3- first horizontal reference plane, 4- first vertical reference plane, 5- CNC hydraulic support adjustment system, 6- boring and milling machine, 7- target reflector, 8- laser tracking measuring instrument, 9- box girder. DETAILED DESCRIPTION
[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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 without making creative work are within the scope of protection of this application.
[0041] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.
[0042] In order to solve the large longitudinal displacement and additional stress caused by temperature difference changes, concrete shrinkage, creep and earthquakes in long-span bridges, some bridges have small box girders between two adjacent large box girders to offset the axial stress between the box girders through longitudinal relative sliding. Therefore, the small box girder without axial force needs to ensure high precision of parallelism and verticality.
[0043] Figure 1 A schematic diagram of the process of the processing method in the embodiment of the present application is shown; Figure 2 A schematic diagram of the installation structure of a small box beam in an embodiment of the present application is shown; Figure 3 A schematic diagram showing a first horizontal reference plane and a first vertical reference plane in an embodiment of the present application is shown; Figure 4 A schematic diagram of the structure of a numerically controlled hydraulic support adjustment system in an embodiment of the present application is shown; Figure 5 A measurement schematic diagram of a laser tracking measuring instrument in an embodiment of the present application is shown.
[0044] The present application is described below with reference to the accompanying drawings and specific embodiments:
[0045] like Figure 1-Figure 5 As shown, this embodiment provides a method for processing a small axial force-free box girder for a bridge, which is used to process and manufacture a small box girder 1 that meets the requirements of flatness, parallelism and verticality, and includes the following steps.
[0046] Step 100: provide more than two box girder segments, and sequentially connect the more than two box girder segments to form a small box girder 1.
[0047] Step 200: Acquire the first horizontal reference plane 3 and the first vertical reference plane 4 of the small box girder 1.
[0048] Step 300: Obtain the end surface machining amount of each box beam segment according to the obtained first horizontal reference plane 3 and the first vertical reference plane 4 and depict the end surface machining line.
[0049] Step 400: dismantle two or more box beam segments in sequence, and mill the end faces of the box beam segments according to the end face machining lines.
[0050] Step 500: Connect the milled box beam segments in sequence to form a small box beam 1, and align them according to the first horizontal reference plane 3 and the first vertical reference plane 4.
[0051] Step 600: milling the pad 2 of the outer wall of the small box beam 1 to a target size.
[0052] Reference Figure 3 When the small box beam 1 is arranged between two groups of box beams 9, the small box beam 1 is formed by connecting two or more box beam segments in sequence, and the adjacent box beam segments are connected by flanges. The box beam segments are mostly rectangular structures, including a top plate, a bottom plate and two opposite side plates. In this embodiment, the outer walls of the top plate, the bottom plate and the side plates are all provided with pads 2, and the small box beam 1 is in direct contact with the support installed in the box beam 9 through the pads 2. A single box beam segment is machined separately, and the machining accuracy of its end face will affect the shape of the spliced small box beam 1. Therefore, the machined box beam segments are spliced in sequence to form a small box beam 1, and the state of the spliced small box beam 1 can be obtained. The operator can preliminarily judge the parallelism and verticality of the pads 2 on the small box beam 1 by measurement.
[0053] Considering that the small box beam 1 is a whole when in use, the present embodiment provides a first horizontal reference plane 3 and a first vertical reference plane 4 perpendicular to each other by splicing the box beam segments as a whole, and uses the first horizontal reference plane 3 and the first vertical reference plane 4 as references for processing the small box beam 1. The first horizontal reference plane 3 can be a horizontal plane, and the first vertical reference plane 4 can be a vertical plane. The small box beam 1 is leveled, and the small box beam 1 is compared with the first horizontal reference plane 3 and the first vertical reference plane 4 to obtain the error size of the flatness and verticality of the spliced small box beam 1. According to the error size, the processing amount of the end face of a single box beam segment can be obtained. According to the obtained processing amount, the end face machining line is engraved on the single box beam segment to facilitate the processing of the boring and milling machine 6.
[0054] It can be understood that by milling the end face of the box girder segment, that is, milling the excess of a single box girder segment that cannot meet the straightness requirements and verticality requirements compared to the first horizontal reference plane 3 and the first vertical reference plane 4, after the milled box girder segments are spliced together according to the previous connection order, the straightness deviation and verticality deviation of the small box girder 1 will be significantly reduced.
[0055] After steps 100 to 500, the straightness deviation and verticality deviation of the outer wall of the small box girder 1 are greatly reduced. On this basis, the pad 2 is further processed to effectively improve the accuracy of the pad 2 on the spliced small box girder 1, and reduce the straightness deviation, verticality deviation and parallelism deviation of the pad on the opposite side wall.
[0056] It should be noted that the area of the pad 2 is smaller than the area of the side plate of the box girder segment, and thus the pad 2 does not affect the acquisition of the first horizontal reference plane 3 and the first vertical reference plane 4.
[0057] Specifically, refer to Figure 4 and Figure 5 This embodiment also provides a numerical control hydraulic support adjustment system 5 and a laser tracking measuring instrument 8. The spliced small box beam 1 can be set on the numerical control hydraulic support adjustment system 5. The numerical control hydraulic support adjustment system 5 can move the small box beam 1 or rotate the small box beam 1 around the horizontal axis and the vertical axis, so that the operator can obtain the data of the small box beam 1 and process the small box beam 1. The first horizontal reference plane 3 and the first vertical reference plane 4 are obtained. The laser tracking measuring instrument 8 is used to obtain the shape data of the small box beam 1, so that the operator can adjust the small box beam 1. Of course, a total station can also be provided to assist in obtaining the shape data of the small box beam 1.
[0058] Step 200 includes:
[0059] Step 201: Obtain the central axes of the end faces at opposite ends of the small box beam 1, obtain a plane through the two central axes, and level the plane to obtain a first horizontal reference plane 3.
[0060] Step 202: Obtain the midpoints of the top ridges of the end faces at opposite ends of the small box girder 1, obtain a vertical line through a plumb bob, and obtain a vertical reference plane through the two vertical lines.
[0061] Reference Figure 3 The small box beam 1 has two opposite ends along its length direction, and the two ends are mostly rectangular. In some embodiments, the central axes of the two ends of the small box beam 1 are respectively obtained by a total station or a laser tracking measuring instrument 8, and a plane is obtained by the two parallel central axes. The state of the small box beam 1 is adjusted by the numerically controlled hydraulic support adjustment system 5 so that the obtained planes are parallel. This plane is the first horizontal reference plane 3. It should be noted that when the end faces of the two ends of the small box beam 1 are rectangular, they have two central axes. When the central axis is obtained by the laser tracking measuring instrument 8 or the total station, the central axis with a smaller angle with the horizontal plane is selected so that the numerically controlled hydraulic support adjustment system 5 can quickly adjust the shape of the small box beam 1.
[0062] After obtaining the first horizontal reference plane 3, the midpoint of the ridgeline at the top of the end faces of the small box girder 1 is obtained by using a laser tracking measuring instrument 8 or a total station. A plumb bob can be used at the midpoint to obtain a vertical line on the end face of the small box girder 1. The plane where the two vertical lines are located is the first vertical reference plane 4.
[0063] Furthermore, the method further comprises step 203: carving the outer wall of the small box girder 1 to connect it with the first horizontal reference plane 3 and the vertical reference plane.
[0064] Reference Figure 3 It can be understood that after the intersection line is carved on the outer wall of the small box girder 1, in step 500, when the milled box girder segments are connected in sequence to form the small box girder 1, the operator can clearly and quickly obtain whether the phase connection lines on the two adjacent box girder segments are located on the same straight line, and since the small box girder 1 is in contact with the box girder through the pad 2, the carved phase connection line does not affect the use of the small box girder 1.
[0065] Specifically, step 400 includes the following steps: step 401: rough milling the end face of the box beam segment according to the end face machining line.
[0066] Step 402: Acquire a second vertical reference plane.
[0067] Step 403: fine milling the box beam segment according to the obtained second vertical reference plane.
[0068] In order to ensure the processing accuracy, after the box beam segment is leveled, a second vertical reference plane is provided according to the ridgeline of the top or bottom of the end face of the processed box beam segment. The second vertical reference plane is a vertical plane, and the excess exceeding the second vertical reference plane is milled according to the second vertical reference plane. Furthermore, the second vertical reference plane directly selects a plane perpendicular to the first horizontal reference plane 3 and the first vertical reference plane 4, which can further improve the straightness of the small box beam 1 after multiple box beam segments are spliced.
[0069] The two steps of rough milling and fine milling can improve the machining accuracy of the end face of the box girder segment. During machining, the step of semi-fine milling can also be included. Specifically, the rough milling cutting amount is controlled below 3 mm, the semi-fine milling cutting amount is controlled at 1 to 1.5 mm, and the fine milling cutting amount is controlled at 0.3 to 0.5 mm or 0.1 to 0.3 mm. Through multiple processing, it is ensured that the processed box girder segment meets the requirements of the small box girder 1.
[0070] Step 600 includes the following steps: Step 601: milling the pad 2 of the outer wall of the small box beam 1 to a target size.
[0071] Step 602: After rough milling the pads 2 of the outer wall of the small box beam 1, obtain the flatness deviation and verticality deviation of each pad 2.
[0072] Step 603: Based on the obtained flatness deviation and verticality deviation, fine mill the pad 2 of the outer wall of the small box beam 1.
[0073] Before processing the pad 2, the spliced small box beam 1 is leveled. Specifically, the first horizontal reference plane 3 can be used as the leveling reference, so that the plane where the central axis of the two end faces of the spliced small box beam 1 is located is in the same plane as the first horizontal reference plane 3. The data of the pad 2 before rough milling is obtained by the laser tracking measuring instrument 8, and the amount of pad 2 to be processed is determined by the obtained pad 2 data. The pad 2 is roughly milled according to the amount of processing, and the flatness deviation and verticality deviation of each pad 2 are obtained by the laser tracking measuring instrument 8 again. Finally, the pad 2 is finely milled according to the obtained flatness deviation and verticality deviation. Of course, the processing process of the pad 2 can also include the step of semi-fine milling.
[0074] Considering that in this embodiment, the outer walls of the four side plates of the box beam segment are all provided with pads 2, the steps of rough milling and fine milling of the pads 2 include:
[0075] Step 701: Mill the top surface of the small box beam 1 and a side pad 2 to the target size.
[0076] Step 702: Flip the small box girder 1 so that the top surface of the small box girder 1 faces downward, level the pad 2 on the top surface of the small box girder 1, use the plane where the leveled pad 2 is located as the machining reference plane, and mill the pads 2 on the other two side surfaces of the small box girder 1 to the target size.
[0077] Among them, the target size of step 701 and step 702 is determined by the operator according to the flatness deviation, verticality deviation and whether the milling operation is in rough milling or fine milling. It can be understood that the existing milling equipment is inconvenient in processing the bottom surface of the small box beam 1. Therefore, through steps 701 and 702, the pad 2 on the top surface is first processed to make the flatness deviation between the pad 2 on the top plate of multiple box beam segments and the horizontal plane small, and then the pad 2 on the same side of the multiple box beam segments is processed to make the verticality deviation of the pad 2 on this side small. After the pads 2 on the top surface and one side of the small box beam 1 are finely milled and it is confirmed that the horizontality deviation and verticality deviation meet the requirements, the small box beam 1 is turned over and the remaining pads 2 are processed in turn. Among them, the plane where the multiple pads 2 on the top plate are located is used as the processing reference plane, and the remaining pads 2 that have not been processed are milled according to the processing reference plane, which can greatly reduce the parallelism deviation between the pads 2 on the top plate of the box beam segment and the pads 2 on the bottom plate. In the present embodiment, in the step of flipping the small box girder 1, the third horizontal reference plane and the third vertical reference plane of the flipped small box girder 1 are obtained, and the method of obtaining the third horizontal reference plane and the third vertical reference plane is the same as the step of obtaining the first horizontal reference plane 3 and the first vertical reference plane 4. After obtaining the third horizontal reference plane and the third vertical reference plane, the small box girder 1 is adjusted through the CNC hydraulic support adjustment system 5 so that the third horizontal reference plane and the third vertical reference plane coincide with the first horizontal reference plane 3 and the first vertical reference plane 4, and the pads 2 on the other sides of the small box girder 1 are processed according to the third horizontal reference plane and the third vertical reference plane to reduce the cumulative error between the pads 2.
[0078] After all the pads 2 on the four sides of the small box girder 1 are processed, the laser tracking measuring instrument 8 is used to measure the flatness of the pads 2 on the four sides of the small box girder 1 respectively. Specifically, the laser tracking measuring instrument 8 is placed at an appropriate position on one side of the small box girder 1, and three target reflectors 7 and a movable reflector are provided, wherein the three target reflectors 7 are not located on the same straight line. The laser tracking measuring instrument 8 is used to track the reflector moving on the surface to be measured, and the three fixed target reflectors 7 are tracked at the same time. Then the laser tracking measuring instrument 8 is placed at an appropriate position on the other side of the small box girder 1, and the three fixed target reflectors 7 are tracked. Through the translation and deflection of the coordinate system, the measurement coordinate system is unified, and then the reflector moving on another surface to be measured is tracked, and the coordinates of each point of the reflector are recorded. The measurement data is processed, and the plane is also fitted to give the angle of the plane in the coordinate system. The overall parallelism and verticality deviations are obtained through the measurement data of the four surfaces to further verify the processing results.
[0079] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0080] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0081] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0082] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0083] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.
[0085] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0086] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.
Claims
1. A method for processing a small box girder without axial force for a bridge, characterized in that: The following steps are involved: Providing more than two box beam segments, and sequentially connecting the more than two box beam segments into a small box beam; Obtain a first horizontal reference plane and a first vertical reference plane of the small box beam, wherein the central axes of the end faces at opposite ends of the small box beam are obtained, a plane is obtained through the two central axes, the plane is leveled to obtain the first horizontal reference plane, the midpoints of the top ridges of the end faces at opposite ends of the small box beam are obtained, a vertical line is obtained through a plumb bob, a first vertical reference plane is obtained through the two vertical lines, and the outer wall of the small box beam is marked to connect it with the first horizontal reference plane and the first vertical reference plane; Obtaining the end surface machining amount of each box beam segment and depicting the end surface machining line according to the obtained first horizontal reference plane and the first vertical reference plane; Dismantle two or more of the box beam segments in sequence, mill the end faces of the box beam segments according to the end face machining lines, roughly mill the end faces of the box beam segments according to the end face machining lines, obtain a second vertical reference plane of the box beam segment after rough milling, and fine mill the box beam segment according to the obtained second vertical reference plane, wherein the second vertical reference plane is perpendicular to the first horizontal reference plane and the first vertical reference plane; Connecting the milled box beam segments in sequence into small box beams, and aligning them according to the first horizontal reference plane and the first vertical reference plane; Milling the pads of the outer wall of the small box beam to a target size, obtaining the flatness deviation and verticality deviation of each pad after rough milling the pads of the outer wall of the small box beam; fine milling the pads of the outer wall of the small box beam according to the obtained flatness deviation and verticality deviation, wherein the steps of rough milling the pads of the outer wall of the small box beam and fine milling the pads of the outer wall of the small box beam both include: milling the pads of the top surface and one side surface of the small box beam to a target size; Flip the small box beam so that the top surface of the small box beam faces downward, obtain the third horizontal reference plane and the third vertical reference plane of the flipped small box beam, adjust the small box beam so that the third horizontal reference plane and the third vertical reference plane coincide with each other, and mill the pads on the remaining two outer walls of the small box beam to the target size.
2. The method for processing a small box girder without axial force for a bridge according to claim 1, characterized in that: A numerically controlled hydraulic support adjustment system is provided, and the numerically controlled hydraulic support adjustment system can rotate and move the small box beam to obtain the first horizontal reference plane and the first vertical reference plane.
3. The method for processing a small box girder without axial force for a bridge according to claim 1, characterized in that: A laser tracking measuring instrument is provided, through which the shape data of the small box beam is acquired.
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