A welding method for U-shaped longitudinal rib patching section

Abstract

The present invention discloses a welding method for a U-shaped longitudinal rib patching section, and relates to the technical field of welding of U-shaped longitudinal rib patching sections. The U-rib patching section is used to fill the gap welded between two plate unit U ribs, and the method comprises the following steps: Step 1, splitting the U-rib patching section to be welded from the splitting line, and dividing it into two upper straight rib plate sections and a lower half U-shaped section; Step 2, embedding the two upper straight rib plate sections into the gap between the two plate unit U ribs, and performing double-sided welding with the connection between the two plate unit steel panels and the connection between the two plate unit U ribs. The present invention can achieve full penetration welding of the inner and outer sides of the upper straight rib plate sections and the surfaces of the two plate unit steel panels at the gap, and the two side surfaces of the two upper straight rib plate sections and the inner and outer sides of the connection between the two plate unit U ribs can also be fully penetrated and welded, which greatly enhances the connection reliability and stability of the U-rib patching section and the surfaces of the two plate unit steel panels.

Description

Technical Field

[0001] The invention relates to the technical field of welding of U-shaped longitudinal rib patching sections, and in particular to a welding method of U-shaped longitudinal rib patching sections. Background Art

[0002] The structure of the plate unit used in the current bridge is that multiple U-shaped longitudinal ribs are welded on the steel panel. Due to the structural characteristics of the plate unit, the panel butt weld and the U-rib butt weld must be staggered during on-site assembly and welding. Generally, the length of multiple U-shaped longitudinal ribs on one side of the plate unit will be about 200mm shorter than the steel panel. In this way, when multiple plate units are installed and spliced ​​and welded on the bridge site, the steel panel is directly fully welded, and the gap of the U-shaped longitudinal rib becomes 400mm. The gap is large, and a patch connection is required at this time. During the on-site installation of the bridge, there are two ways of patch connection between U-shaped longitudinal ribs: high-strength bolt connection and embedded patch welding.

[0003] Among them, the use of high-strength bolt connections has the following problems:

[0004] For bridge decks without exposed bottom plates, the fracture of high bolts in the U-shaped longitudinal rib bolted joints poses a safety hazard to vehicles and personnel under the bridge; the maintenance cost of high bolt joints is much higher than that of welded joints.

[0005] There are problems with patching welding:

[0006] The U-shaped longitudinal rib is a continuous beam elastically supported on the diaphragm. Under the action of large vertical wheel pressure load, longitudinal bending moment will be generated on the U-shaped longitudinal rib. The vertical cracks in the patched section of the U-shaped longitudinal rib are mainly caused by the cyclic principal stress generated by the longitudinal bending moment.

[0007] The connecting weld between the U-shaped longitudinal rib patching section and the top plate cannot be double-sided welded or fully penetrated, and therefore cannot match the double-sided welding or full penetration welding of the U-shaped longitudinal rib of the plate unit. Therefore, it cannot meet the larger vertical wheel pressure load. After a certain period of time, there is a greater risk of cracks appearing at the single-sided weld between the patching section and the steel panel, and then there is a risk of breakage.

[0008] If steel backing plates are used for auxiliary welding, due to processing deviations, the installed steel backing plates are often not closely attached to the thin longitudinal rib wall plates, which can easily lead to welding defects in the positioning welds and generate greater stress concentration at the weld root. In addition, the welding process of the patching section is generally overhead welding, and the welding quality is not easy to guarantee.

[0009] The U-shaped longitudinal rib patching section uses steel pads for the butt joints, which not only increases the workload of plate unit production, but also makes it difficult for the installed steel pads to meet the quality requirements of weld flaw detection;

[0010] Since the U-shaped longitudinal rib patching section and the top plate cannot be double-sided welded or fully fused, some designers do not require double-sided welding or full fusion welding for the bridge top plate unit, and only require single-sided partial penetration welding (80% penetration).

[0011] For double-deck bridges with dual-use for road and rail, since the railway is on the lower deck, the U-shaped longitudinal ribs on the upper deck are bolted to high bolts, which poses a greater safety threat to the operation of the high-speed railway on the lower deck. Therefore, the use of patching welding is an urgent issue to be solved for this type of bridge. Therefore, it is a technical problem to be solved urgently if a welding process that can fully penetrate the U-rib patching section and the steel panel can be developed. Summary of the invention

[0012] In order to solve the technical problems of the above-mentioned forest fire extinguishing bomb, the present invention provides a welding method for a U-shaped longitudinal rib patching section. The following technical solution is adopted:

[0013] A method for welding a U-shaped longitudinal rib patching section, using the U-rib patching section to fill the gap welded between two U ribs of plate units, comprises the following steps:

[0014] Step 1, split the U-rib patching section to be welded along the cutting line into two upper straight rib plate sections and a lower semi-U-shaped section;

[0015] Step 2: embed the two upper straight rib plate segments into the gap between the two plate unit U ribs, and perform double-sided welding with the connection between the two plate unit steel panels and the connection between the two plate unit U ribs respectively;

[0016] Step 3, embed the lower half U-shaped segment into the gap between the U ribs of the two plate units, and weld it to the outer side of the cross section of the two upper straight rib plate segments on one side;

[0017] Step 4: Single-sidedly weld the two side edges of the lower half U-shaped segment to the outer sides of the connection between the two plate unit U ribs.

[0018] By adopting the above technical scheme, a U-rib patching section is used to connect the gap between the U ribs of two plate units. The U-rib patching section to be welded is first cut from the cutting line to obtain two upper straight rib plate sections. The two upper straight rib plate sections are welded first, so that the inner and outer sides of the upper straight rib plate sections and the surfaces of the two plate unit steel panels at the gap can be fully welded, and the two side surfaces of the two upper straight rib plate sections and the inner and outer sides of the connection between the U ribs of the two plate units can also be fully welded, which greatly enhances the connection reliability and stability of the welding between the U-rib patching section and the surfaces of the two plate unit steel panels. In the subsequent use of the bridge, since the load mainly comes from the vertical wheel pressure, the use of double-sided full welding will undoubtedly greatly increase the reliability of the plate unit splicing.

[0019] Optionally, the method for making the U-rib patching section in step 1 is: measure the gap width dimension B between the U ribs of two plate units, use U ribs that are consistent with the U rib size of the plate unit to cut the U rib patching section, the width dimension of the U rib patching section is Ba, |B-3|<Ba<B, and the unit of the width dimension is millimeter.

[0020] By adopting the above technical solution, the width of the U-rib patching section can be slightly smaller than the gap width between the U-ribs of the two plate units, which is convenient for subsequent embedding construction and also meets welding requirements.

[0021] Optionally, assuming that the total height of the U-rib patching section is H, the vertical distance between the sectioning line and the U-shaped bottom surface of the U-rib patching section is Hp, and 1 / 3H≥Hp≥1 / 2H.

[0022] Optionally, the method for determining the position of the sectioning line is:

[0023] Assume the wall thickness of the U-rib patching section is Wq, and the thickness of the standard U-rib is W;

[0024] but

[0025] By adopting the above technical solution, the U-rib patching section is mainly cut open for the subsequent full welding of the two upper straight rib plate sections with the inner and outer sides of the connection between the two plate unit U ribs and the two plate unit steel panels. Therefore, it is better that the two upper straight rib plate sections are longer than the lower semi-U-shaped section. While maximizing the coverage rate of the double-sided full welding parts, the integrity of the U-rib patching section will not be destroyed in the material preparation stage. In theory, the greater the wall thickness of the U-rib patching section, the greater the strength and stability after subsequent welding. In principle, when the thickness of the standard U rib W = 8mm, the vertical distance between the cutting line and the U-shaped bottom surface of the U-rib patching section is Hp = 1 / 2H, which is preferred.

[0026] Optionally, the specific method of step 1 is: use cutting equipment to cut the U-rib patching section from the cutting line. If the wall thickness of the U rib of the plate unit is Wq≥W, then the upper straight rib plate section will be chamfered on both sides of one end welded to the plate unit steel panel, and the outer edge of the other end is chamfered. Both sides of the two side end faces are chamfered, the chamfer angle is 45°, and the blunt edge of the chamfer is 2mm.

[0027] By adopting the above technical solution, when the thickness of the standard U rib is W=8mm, if the wall thickness of the plate unit U rib is Wq≥8mm, groove treatment is required during welding to achieve double-sided full penetration welding and improve the connection strength and stability of the welding part.

[0028] Optionally, the specific method of step 2 is: use auxiliary welding parts to assist in the welding of the two upper straight rib plate segments, first place the bottom of the auxiliary welding part in the gap between the two plate unit U ribs, adjust the height support height, and then place the inner sides of the two upper straight rib plate segments close to the auxiliary welding parts, and make one end face with chamfers on both sides contact the upper surface of the two plate unit steel panels, perform full welding on both sides at the chamfers, and then perform double-sided welding on the two side end faces of the two upper straight rib plate segments and the connection between the two plate unit U ribs.

[0029] Optionally, the auxiliary welded parts include a base plate, a plurality of adjustable height support bolts, four support members and four locking bolts. A plurality of height adjustment threaded holes are respectively arranged at the bottom of the base plate, and a plurality of connecting holes for docking with support members of different sizes are arranged on the side. The plurality of adjustable height support bolts are respectively screwed at the plurality of height adjustment threaded holes. The support members include an inclined support section and a connecting section. A support head is provided at one end of the inclined support section, one end of the connecting section is fixedly connected to the other end of the inclined support section, and the other end of the connecting section is inserted into the connecting hole on the side of the base plate, and the locking threaded section arranged on the connecting section is locked by the locking bolt.

[0030] By adopting the above technical scheme, since the two upper straight rib plate segments are straight segments, in the initial stage of welding, since the side edges of the U ribs are slightly beveled, their positions are not easy to fix during manual welding, and auxiliary welding parts are used for auxiliary positioning. First, the four locking bolts are loosened, and the four support members are inserted into the bottom of the multiple connecting holes, and the auxiliary welding members are placed in the gap between the U ribs of the two plate units. Then, the support height of the adjustable height support bolts is adjusted according to the size data of the U rib patching segment to be welded, and then the positions of the support heads at the ends of the four support members are adjusted. Finally, the four locking bolts are locked, so that the inner sides of the two upper straight rib plate segments can be supported, which can improve the position accuracy of the two upper straight rib plate segments during butt welding, and further improve the stability and strength of welding.

[0031] Optionally, the support head is a sphere made of polytetrafluoroethylene.

[0032] By adopting the above technical solution, the sphere made of polytetrafluoroethylene can flexibly support the inner side of the upper straight rib plate segment. Since it is only a support, the contact position with the inner side of the upper straight rib plate segment is not a direct welding position, and the temperature will not be particularly high, so the high temperature resistance of polytetrafluoroethylene meets the high temperature resistance requirements.

[0033] Optionally, the specific method of step 3 is: by lowering the support height of multiple adjustable height support bolts respectively, disassembling the four support parts respectively, and then taking out the auxiliary welded parts, embedding the lower semi-U-shaped section into the gap between the U ribs of the two plate units, the open section of the lower semi-U-shaped section coincides with the sections of the two upper straight rib plate sections, and performing outer single-sided welding at the overlapping section.

[0034] By adopting the above technical solution, since the load at the gap connection mainly comes from the vertical wheel pressure, the three end faces of the two upper straight rib plate sections are fully welded on both sides. Even if the connection of the lower semi-U-shaped section is fully welded on one side, it is sufficient to support the continuous pressure of the vertical wheel pressure load.

[0035] Optionally, all welding parts are fully welded by manual gas shielded welding.

[0036] In summary, the present invention includes at least one of the following beneficial technical effects:

[0037] The present invention can provide a welding method for U-shaped longitudinal rib patching sections, which adopts the U-rib patching section to connect the gap between the U ribs of two plate units, firstly cuts the U-rib patching section to be welded, and first welds the obtained two upper straight rib plate sections, so that the inner and outer sides of the upper straight rib plate sections and the surfaces of the two plate unit steel panels at the gap can be fully penetrated and welded, and the two side surfaces of the two upper straight rib plate sections and the inner and outer sides of the connection between the two plate unit U ribs can also be fully penetrated and welded, which greatly enhances the connection reliability and stability of the welding between the U-rib patching section and the surfaces of the two plate unit steel panels. In the subsequent use of the bridge, since the load mainly comes from the vertical wheel pressure, the use of double-sided full welding will undoubtedly greatly increase the reliability of the plate unit splicing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of completing gap welding by using a welding method of a U-shaped longitudinal rib patching section of the present invention;

[0039] Figure 2 It is a structural schematic diagram before welding using a welding method of a U-shaped longitudinal rib patching section of the present invention;

[0040] Figure 3 It is a structural schematic diagram of welding two upper straight rib plate sections by using a welding method of a U-shaped longitudinal rib patching section of the present invention;

[0041] Figure 4 It is a structural schematic diagram of the U-rib patching section;

[0042] Figure 5 It is a structural schematic diagram of auxiliary welding parts.

[0043] Explanation of the reference numerals in the accompanying drawings: 1. U-rib patching section; 11. Upper straight rib plate section; 12. Lower semi-U-shaped section; 2. Plate unit U rib; 3. Plate unit steel panel; 4. Auxiliary welding parts; 41. Base plate; 42. Adjustable height support bolts; 43. Support member; 431. Inclined support section; 4311. Support head; 432. Connecting section; 44. Locking bolt; 100. Sectioning line. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0045] The embodiment of the present invention discloses a welding method for a U-shaped longitudinal rib patching section.

[0046] Reference Figure 1 - Figure 5 A method for welding a U-shaped longitudinal rib patching section, using a U-rib patching section 1 to fill a gap welded between two plate unit U ribs 2, comprises the following steps:

[0047] Step 1, cutting the U-rib patching section 1 to be welded along the cutting line 100 into two upper straight rib plate sections 11 and a lower semi-U-shaped section 12;

[0048] Step 2: embed the two upper straight rib plate segments 11 into the gap between the two plate unit U ribs 2, and perform double-sided welding with the connection between the two plate unit steel panels 3 and the connection between the two plate unit U ribs 2;

[0049] Step 3, embed the lower half U-shaped section 12 into the gap between the two plate unit U ribs 2, and weld it to the outer side of the cross section of the two upper straight rib plate sections 11 on one side;

[0050] Step 4: Single-sidedly weld the two side edges of the lower half U-shaped segment 12 to the outer sides of the connection between the two plate unit U ribs 2 respectively.

[0051] A U-rib patching section 1 is used to connect the gap between the U ribs 2 of two plate units. The U-rib patching section 1 to be welded is first cut from the cutting line 100 to obtain two upper straight rib plate sections 11. The two upper straight rib plate sections 11 are welded first, so that the inner and outer sides of the upper straight rib plate sections 11 and the surfaces of the two plate unit steel panels 3 at the gap can be fully welded, and the two side surfaces of the two upper straight rib plate sections 11 and the inner and outer sides of the connection between the two plate unit U ribs 2 can also be fully welded, which greatly enhances the connection reliability and stability of the U-rib patching section 1 and the surface welding of the two plate unit steel panels 3. In the subsequent use of the bridge, since the load mainly comes from the vertical wheel pressure, the use of double-sided full welding will undoubtedly greatly increase the reliability of the plate unit splicing.

[0052] The manufacturing method of the U-rib patching section 1 in step 1 is: measure the gap width dimension B between the two plate unit U ribs 2, use a U rib with the same size as the plate unit U rib 2 to cut the U-rib patching section 1, the width dimension of the U-rib patching section 1 is Ba, |B-3|<Ba<B, and the unit of the width dimension is millimeter.

[0053] The width of the U-rib patching section 1 only needs to be slightly smaller than the gap width between the two plate unit U-ribs 2, which is convenient for subsequent embedding construction and also meets welding requirements.

[0054] Assuming that the total height of the U-rib patching section 1 is H, the vertical distance between the sectioning line 100 and the U-shaped bottom surface of the U-rib patching section 1 is Hp, and 1 / 3H≥Hp≥1 / 2H.

[0055] The method for determining the position of the cutting line 100 is:

[0056] Assume that the wall thickness of the U-rib patching section 1 is Wq, and the thickness of the standard U-rib is W;

[0057] but

[0058] The U-rib patching section 1 is mainly cut open for the subsequent full welding of the two upper straight rib plate sections 11 with the inner and outer sides of the connection between the two plate unit U ribs 2 and the two plate unit steel panels 3. Therefore, it is better that the two upper straight rib plate sections 11 are longer than the lower semi-U-shaped section 12 in length. While maximizing the coverage rate of the double-sided full welding parts, the integrity of the U-rib patching section 1 will not be destroyed in the material preparation stage. Theoretically, the greater the wall thickness of the U-rib patching section 1, the greater the strength and stability after subsequent welding. In principle, when the thickness of the standard U rib W = 8 mm, the vertical distance between the cutting line 100 and the U-shaped bottom surface of the U-rib patching section 1 is Hp = 1 / 2H, which is preferred.

[0059] The specific method of step 1 is: use cutting equipment to cut the U-rib patching section 1 from the cutting line 100. If the wall thickness Wq≥W of the plate unit U rib 2, the upper straight rib plate section 11 will be welded to the plate unit steel panel 3 on both sides of one end and the outer side of the other end is chamfered. Both sides of the two side end faces are chamfered, the chamfer angle is 45°, and the chamfer blunt edge is 2mm.

[0060] When the thickness of the standard U rib is W=8 mm, if the wall thickness of the plate unit U rib 2 is Wq≥8 mm, groove processing is required during welding to achieve double-sided full penetration welding and improve the connection strength and stability of the welding part.

[0061] The specific method of step 2 is: use the auxiliary welding part 4 to assist in welding the two upper straight rib plate segments 11, first place the bottom of the auxiliary welding part 4 in the gap between the two plate unit U ribs 2, adjust the height support height, and then place the inner sides of the two upper straight rib plate segments 11 close to the auxiliary welding part 4, and one end face with a chamfer on both sides is in contact with the upper surface of the two plate unit steel panels 3, and full welding is performed on both sides at the groove, and then the two side end faces of the two upper straight rib plate segments 11 are respectively double-sidedly welded to the connection between the two plate unit U ribs 2.

[0062] The auxiliary welding part 4 includes a base plate 41, a plurality of adjustable height support bolts 42, four support members 43 and four locking bolts 44. A plurality of height adjustment threaded holes are respectively arranged at the bottom of the base plate 41, and a plurality of connecting holes for docking support members 43 of different sizes are arranged on the side. The plurality of adjustable height support bolts 42 are respectively screwed at the plurality of height adjustment threaded holes. The support member 43 includes an inclined support section 431 and a connecting section 432. A support head 4311 is arranged at one end of the inclined support section 431, and one end of the connecting section 432 is fixedly connected to the other end of the inclined support section 431. The other end of the connecting section 432 is inserted into the connecting hole on the side of the base plate 41 and is locked by the locking bolt 44 to the locking threaded section arranged on the connecting section 432.

[0063] Since the two upper straight rib plate segments 11 are straight segments, in the initial stage of welding, since the side edges of the U ribs are slightly beveled, their positions are not easy to fix during manual welding, and auxiliary welding parts 4 are used for auxiliary positioning. First, the four locking bolts 44 are loosened, and the four support members 43 are inserted into the bottom of the multiple connecting holes, and the auxiliary welding parts 4 are placed in the gap between the two plate unit U ribs 2, and then the support height of the adjustable height support bolts 42 is adjusted according to the size data of the U rib patching segment 1 to be welded, and then the positions of the support heads 4311 at the ends of the four support members 43 are adjusted, and finally the four locking bolts 44 are locked, so that the inner side surfaces of the two upper straight rib plate segments 11 can be supported, which can improve the position accuracy of the two upper straight rib plate segments 11 during butt welding, and further improve the stability and strength of welding.

[0064] The support head 4311 is a sphere made of polytetrafluoroethylene.

[0065] The sphere made of polytetrafluoroethylene can flexibly support the inner side of the upper linear rib plate section 11. Since it is only a support, the contact position with the inner side of the upper linear rib plate section 11 is not a direct welding position, and the temperature is not particularly high, so the high temperature resistance of polytetrafluoroethylene meets the high temperature resistance requirements.

[0066] The specific method of step 3 is: by lowering the support height of multiple adjustable height support bolts 42 respectively, disassembling the four support parts 43 respectively, and then taking out the auxiliary welding part 4, the lower semi-U-shaped section 12 is embedded into the gap between the two plate unit U ribs 2, and the open section of the lower semi-U-shaped section 12 coincides with the sections of the two upper straight rib plate sections 11 respectively, and the outer side single-sided welding is performed at the overlapping section.

[0067] Since the load at the gap connection mainly comes from the vertical wheel pressure, the three end faces of the two upper straight rib plate sections 11 are fully welded on both sides. Even if the connection of the lower semi-U-shaped section 12 is fully welded on one side, it is sufficient to support the continuous pressure of the vertical wheel pressure load.

[0068] All welding parts are fully welded by manual gas shielded welding.

[0069] The implementation principle of a welding method for a U-shaped longitudinal rib patching section in an embodiment of the present invention is as follows:

[0070] In a specific bridge plate unit splicing application, a U-rib patching segment 1 is used. The material of the U-rib patching segment 1 is Q345qD steel. The gap welded between two plate unit U ribs 2 is filled. The size of the U-rib patching segment 1 is consistent with the plate unit U rib 2. The width of the gap between the two plate unit U ribs 2 is measured to be 400mm. The U-rib patching segment 1 is cut using a U-rib that is consistent with the size of the plate unit U rib 2. The width of the U-rib patching segment 1 is 399mm, the height H is 280mm, the wall thickness is 8mm, and the vertical distance between the cutting line 100 and the U-shaped bottom surface of the U-rib patching segment 1 is Hp=1 / 3H.

[0071] After cutting, the upper straight rib plate section 11 is beveled on both sides of one end welded to the plate unit steel panel 3, and the outer edge of the other end is beveled. Both sides of the two side end faces are beveled, with a bevel angle of 45° and a blunt edge of 2 mm.

[0072] Auxiliary welding parts 4 are used to assist in the welding of the two upper straight rib plate sections 11. First, the bottom of the auxiliary welding part 4 is placed in the gap between the two plate unit U ribs 2, and the height support height is adjusted. Then, the inner sides of the two upper straight rib plate sections 11 are respectively pressed against the auxiliary welding parts 4, and one end face with chamfers on both sides is in contact with the upper surface of the two plate unit steel panels 3. Full welding is performed on both sides at the groove, and then the two side end faces of the two upper straight rib plate sections 11 are respectively double-sidedly welded to the connection between the two plate unit U ribs 2.

[0073] By lowering the supporting heights of the multiple adjustable height supporting bolts 42 respectively, disassembling the four supporting parts 43 respectively, and then taking out the auxiliary welding part 4, the lower semi-U-shaped section 12 is embedded into the gap between the two plate unit U ribs 2, and the open cross-section of the lower semi-U-shaped section 12 coincides with the cross-sections of the two upper straight rib plate sections 11, and single-sided welding is performed on the outside at the overlapping section.

[0074] After welding is completed, a fatigue test of vertical wheel pressure load is carried out on the patched part. The fatigue test is divided into a fatigue test of continuous vertical load and a fatigue test of short-interval vertical load.

[0075] The principle of fatigue test is to simulate the number of times a real bridge resists fatigue damage under the stress state of alternating wheel load, such as the state of a real bridge;

[0076] Fatigue test of continuous vertical load: the bridge deck is on the top, and the U-rib patch section 1 is on the bottom. The top wing plate of the U-rib patch section 1 is fixed on the base of the fatigue testing machine. The fatigue testing machine loads a continuous vertical load P from top to bottom. The load P refers to the vertical load pressure converted from the maximum load allowed by the bridge deck. Here, this vertical load pressure is applied to the U-rib patch section 1, which can truly reflect the ultimate bearing capacity and temperature resistance of the U-rib patch section 1. The wheel load is simplified into a concentrated load and acts on the U-rib patch section 1. After the continuous vertical load P lasts for 7*24 hours, no cracks are found after flaw detection of the U-rib patch section 1.

[0077] A fatigue testing machine was used to apply a continuous vertical load of 1.5P from top to bottom. After the continuous vertical load of 1.5P lasted for 7*24 hours, the U-rib patching section 1 was inspected and no cracks were found.

[0078] A continuous vertical load of 2P was applied from top to bottom by a fatigue testing machine. After the continuous vertical load of 2P lasted for 7*24 hours, cracks were found after flaw detection on the U-rib patching section 1.

[0079] Short-interval vertical load fatigue test: The bridge deck is on top, the U-rib patch section 1 is on the bottom, and the top wing plate of the U-rib patch section 1 is fixed on the base of the fatigue testing machine. The fatigue testing machine loads the interval vertical load 2P from top to bottom. The duration of a single vertical load 2P is 5 seconds, and the interval between two vertical loads 2P is 5 seconds. After the interval vertical load 2P lasts for 30*24 hours, the U-rib patch section 1 is tested for cracks and no cracks are found.

[0080] The fatigue testing machine applies an interval vertical load 2P from top to bottom. The duration of a single vertical load 2P is 1 second, and the interval between two vertical loads 2P is 2 seconds. After the interval vertical load 2P lasts for 30*24 hours, the U-rib embedded segment 1 is inspected for cracks and no cracks are found.

[0081] The fatigue testing machine applies an interval vertical load 3P from top to bottom. The duration of a single vertical load 2P is 5 seconds, and the interval between two vertical loads 2P is 5 seconds. After the interval vertical load 2P lasts for 30*24 hours, the U-rib embedded segment 1 is inspected for cracks.

[0082] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding method for a U-shaped longitudinal rib patching section, characterized in that: The method of using a U-rib patching section (1) to fill a gap welded between two plate unit U-ribs (2) comprises the following steps: Step 1, cutting the U-rib patching section (1) to be welded along the cutting line (100) into two upper straight rib plate sections (11) and a lower semi-U-shaped section (12); Step 2, embedding two upper straight rib plate segments (11) into the gap between the two plate unit U ribs (2), and double-sided welding them to the connection points of the two plate unit steel panels (3) and the connection points of the two plate unit U ribs (2); Step 3, embed the lower half U-shaped section (12) into the gap between the two plate unit U ribs (2), and weld it to the outer side of the cross section of the two upper straight rib plate sections (11) on one side; Step 4, single-sidedly welding the two side edges of the lower half U-shaped segment (12) to the outer sides of the connection between the two plate unit U ribs (2); The method for manufacturing the U-rib patching section (1) in step 1 is as follows: measuring the gap width B between two plate unit U ribs (2), using a U rib having the same size as the plate unit U rib (2) to cut the U-rib patching section (1), the width of the U-rib patching section (1) being Ba, |B-3|<Ba<B, and the unit of the width is millimeter; Assuming that the total height of the U-rib patching section (1) is H, the vertical distance between the sectioning line (100) and the U-shaped bottom surface of the U-rib patching section (1) is Hp, then 1 / 3H≥Hp≥1 / 2H; The position of the sectioning line (100) is determined by: Assume that the wall thickness of the U-rib patching section (1) is Wq, and the thickness of the standard U-rib is W; but 2. The welding method of a U-shaped longitudinal rib patching section according to claim 1 is characterized in that: The specific method of step 1 is: using a cutting device to cut the U-rib patching section (1) from the cutting line (100); if the wall thickness Wq of the plate unit U rib (2) is greater than or equal to W, then the upper straight rib plate section (11) is subjected to chamfering treatment on both sides of one end welded to the plate unit steel panel (3), and the outer edge of the other end is subjected to chamfering treatment, and both sides of the two side end faces are subjected to chamfering treatment, the chamfer angle is 45°, and the chamfer blunt edge is 2mm.

3. A welding method for a U-shaped longitudinal rib patching section according to claim 2, characterized in that: The specific method of step 2 is: use an auxiliary welding piece (4) to assist in welding the two upper straight rib plate segments (11), first place the bottom of the auxiliary welding piece (4) in the gap between the two plate unit U ribs (2), adjust the height support height, and then place the inner sides of the two upper straight rib plate segments (11) close to the auxiliary welding piece (4), and one end face with a chamfer on both sides is in contact with the upper surface of the two plate unit steel panels (3), and full welding is performed on both sides at the groove, and then the two side end faces of the two upper straight rib plate segments (11) are respectively double-sided welded to the connection between the two plate unit U ribs (2).

4. A welding method for a U-shaped longitudinal rib patching section according to claim 3, characterized in that: The auxiliary welding member (4) comprises a base plate (41), a plurality of adjustable height support bolts (42), four support members (43) and four locking bolts (44); the base plate (41) is provided with a plurality of height adjustment threaded holes at the bottom, and a plurality of connection holes for connecting support members (43) of different sizes are provided at the side; the plurality of adjustable height support bolts (42) are respectively screwed at the plurality of height adjustment threaded holes; the support member (43) comprises an inclined support section (431) and a connection section (432); a support head (4311) is provided at one end of the inclined support section (431); one end of the connection section (432) is fixedly connected to the other end of the inclined support section (431); the other end of the connection section (432) is inserted into the connection hole at the side of the base plate (41) and is locked by the locking bolt (44) to the locking threaded section provided on the connection section (432).

5. A welding method for a U-shaped longitudinal rib patching section according to claim 4, characterized in that: The support head (4311) is a sphere made of polytetrafluoroethylene.

6. A welding method for a U-shaped longitudinal rib patching section according to claim 5, characterized in that: The specific method of step 3 is: by lowering the support height of multiple adjustable height support bolts (42) respectively, disassembling the four support parts (43) respectively, and then taking out the auxiliary welding part (4), the lower semi-U-shaped section (12) is embedded in the gap between the two plate unit U ribs (2), and the open section of the lower semi-U-shaped section (12) is overlapped with the sections of the two upper straight rib plate sections (11), and the outer side single-sided welding is performed at the overlapped section.

7. A welding method for a U-shaped longitudinal rib patching section according to claim 6, characterized in that: All welding parts are fully welded by manual gas shielded welding.

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