A welding device for double-limb arch rib bridge structure

Abstract

The present invention discloses a welding device for a double-limbed arch rib bridge structure, and relates to the technical field of welding devices for bridge structures. A welding device for a double-limbed arch rib bridge structure comprises a base, and further comprises: columns, respectively mounted at the four corners of the base; crossbeams, respectively slidably arranged between two adjacent columns; positioning plates, respectively connected to the two crossbeams through square steel guide rods, the two positioning plates being arranged opposite to each other, and positioning ends being mounted on the positioning plates for limiting the webs; the present invention limits the webs by positioning ends, positions the two ends of the upper steel pipe by positioning pulleys, and positions the two ends of the upper steel pipe and the lower steel pipe by linkage push plates 1 and 2 during the downward movement of the crossbeam, thereby achieving precise positioning of the various components of the double-limbed arch rib bridge structure. Accurate positioning can effectively reduce welding deviations, ensure the uniformity and consistency of welds, thereby improving the strength and stability of welded joints and improving the overall welding quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding devices for bridge structural components, and in particular relates to a welding device for double-limb arch rib bridge structural components. Background Art

[0002] Arch ribs are the structural components of arch bridges. Their main function is to bear the thrust of the arch and transfer it to supporting structures such as piers or abutments. Double-limbed arch rib bridges are pre-rolled from steel plates into steel tubes. Webs are welded between the two tubes, and the tubes are then filled with self-compacting shrinkage-compensating concrete. The webs are not filled, and the arch ribs are manufactured in sections in the factory, transported by truck, and then erected in sections by truck cranes on site before being butt-welded (refer to the finished arch ribs). Figure 13 );

[0003] When the arch ribs are manufactured in sections in the factory, the two steel pipes need to be aligned with the webs. However, the existing welding fixtures need to be adjusted repeatedly by humans during alignment, which can easily lead to errors in the spacing between the webs, uneven steel pipe ends, and poor stability when the arch ribs are fitted together. This can easily cause the arch ribs to shake and make it impossible for adjacent arch ribs to be aligned. This leads to repeated adjustments in the welding process, affecting welding efficiency and quality. Therefore, a double-limb arch rib bridge structure welding device is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a double-limb arch rib bridge structural member welding device that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a double-limb arch rib bridge structure welding device, including a base, and also including: columns, respectively installed at the four corners of the base; two cross beams, respectively slidably arranged between two adjacent columns; positioning plates, respectively connected to the two cross beams through square steel guide rods, the two positioning plates are arranged opposite to each other, and positioning ends are installed on the positioning plates to limit the webs; positioning pulleys are respectively arranged on both sides of the positioning plates to position the two ends of the upper steel pipe; support plates are respectively arranged under the two cross beams; positioning bases are respectively arranged on the base; the lower steel pipe is placed on the positioning base, and then the upper steel pipe is placed on the web of the positioning plate. Under the dead weight of the upper steel pipe, the cross beam moves down and contacts the support plate. During the downward movement of the cross beam, the push plate 1 and push plate 2 symmetrically arranged in linkage position respectively position the two ends of the upper steel pipe and the lower steel pipe.

[0006] Preferably, slide plates are fixedly connected to both ends of the beam, the slide plates are slidably connected to the columns, a fixing plate is fixedly connected to the columns, and a spring is connected between the slide plates and the fixing plate.

[0007] Preferably, a limit frame is fixedly connected to the crossbeam, the four square steel guide rods are slidably connected to the limit frame, the ends of the four square steel guide rods are connected to a connecting plate, and a hydraulic rod is connected between the connecting plate and the crossbeam.

[0008] Preferably, a rack 1 is fixedly connected to the support plate, a support frame is symmetrically fixedly connected to the crossbeam, a screw rod 1 and a guide rod 1 are respectively connected through the two support frames, a gear 1 is threadedly connected to the screw rod 1, the gear 1 is meshed with the rack 1, the push plate 1 is fixedly connected to the front end of the guide rod 1 and the screw rod 1, the rear end of the guide rod 1 and the screw rod 1 is fixedly connected to the rear plate 1, a sliding rod is fixedly connected to the rear plate 1, and the sliding rod is slidably connected to the connecting plate.

[0009] Preferably, connecting rods are fixedly connected to the columns, and the connecting rods between adjacent columns are connected to the support plate, forming a triangle between the adjacent connecting rods and the base.

[0010] Preferably, adjacent connecting rods are respectively connected with screw rod 2 and guide rod 2, push plate 2 is fixedly connected to the front end of screw rod 2 and guide rod 2, and the rear end of screw rod 2 and guide rod 2 is fixedly connected to rear plate 2, screw rod 2 is threadedly connected with gear 2, and the crossbeam is fixedly connected with rack 2, and gear 2 is meshed with rack 2.

[0011] Preferably, six pressure sensors are installed on the adjacent surfaces of the two positioning plates, and the six pressure sensors are respectively placed at the four corners of the positioning plates and the middle of the edges of the positioning plates to monitor the force exerted by the web on the positioning plates during welding, so as to judge the abnormal stress during welding and select the corresponding cooling method.

[0012] Preferably, cooling air grooves are provided at the upper and lower ends of the positioning end head.

[0013] Preferably, a circular cooling passage is provided in the positioning plate.

[0014] A double-limb arch rib bridge structural member welding device adopts the following cooling method:

[0015] S1. When the pressures of the three pressure sensors in any group of the pressure sensors 120b, 120d, 120f or the pressure sensors 120a, 120c, 120e all exceed the set threshold, the power of the cooling duct is activated to dissipate heat;

[0016] S2. When the pressures of the pressure sensors 120a, 120b, 120c, 120d, 120e, and 120f all exceed the set thresholds, the power of the cooling air trough and the circular cooling passage are activated to dissipate heat, and the welding current is reduced by 10%-15%, and the welding speed is reduced by 20%-30%;

[0017] S3. When the pressure of all pressure sensors in any group of the pressure sensors 120a, 120b, 120e, 120f or the pressure sensors 120c, 120d exceeds the set threshold, the power of the cooling air trough is activated, the circular cooling passage dissipates heat, welding is stopped, and a level 3 red alarm is issued.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] 1. This double-legged arch-rib bridge structural component welding device achieves precise positioning of the various components of the double-legged arch-rib bridge structure by limiting the web plate with a positioning end, positioning the upper steel tube at both ends with a positioning pulley, and linking push plates 1 and 2 to position the upper and lower steel tubes respectively during the downward movement of the crossbeam. This precise positioning effectively reduces welding deviations and ensures the uniformity and consistency of welds, thereby improving the strength and stability of welded joints, enhancing overall welding quality, and ensuring the safety and reliability of bridge structural components. Furthermore, during the downward movement of the crossbeam, the upper and lower steel tubes are positioned automatically by linking push plates 1 and 2, eliminating the need for additional manual positioning operations, reducing manual adjustment intervention, and improving positioning efficiency and accuracy.

[0020] 2. The double-limb arch rib bridge structural component welding device uses six-point pressure sensors to monitor stress distribution in real time, triggers graded cooling by comparing thresholds, and provides early warning of web deformation risks. It also uses multiple cooling methods to cool the welds and webs, improving the degree of welding automation.

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached figure:

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0024] Figure 2 This is a structural schematic diagram of the columns and base of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0025] Figure 3 for Figure 2 The intention of enlarging at A in the middle;

[0026] Figure 4 This is a schematic structural diagram of rack 1 and rack 2 of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0027] Figure 5This is a top view of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0028] Figure 6 This is a structural schematic diagram of a positioning end head and a positioning plate of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0029] Figure 7 This is a schematic structural diagram of a screw rod 1, gear 1, screw rod 2, gear 2 of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0030] Figure 8 This is a structural schematic diagram of a double-limb arch rib bridge structural member welding device proposed by the present invention, comprising a first square steel pipe, a second square steel pipe, a third square steel pipe, and a limit frame;

[0031] Figure 9 This is a schematic structural diagram of a crossbeam of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0032] Figure 10 is a schematic diagram of six pressure sensors;

[0033] Figure 11 This is a schematic structural diagram of a serpentine cooling passage in a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0034] Figure 12 This is a schematic structural diagram of the web of a double-limb arch rib bridge structural member welding device proposed by the present invention;

[0035] Figure 13 This is a schematic diagram of the existing arch rib after welding.

[0036] In the figure: 1, base; 10, upper steel pipe; 101, web; 102, lower steel pipe; 103, positioning base; 104, waist-shaped hole; 11, column; 111, slide plate; 112, spring; 113, fixing plate; 12, crossbeam; 120, pressure sensor; 121, limit frame; 122, square steel guide rod; 1221, square steel pipe 1; 1222, square steel pipe 2; 1223, square steel pipe 3; 123, positioning plate; 1231, return cooling passage; 124, fixed Position end; 1241, cooling air trough; 125, positioning pulley; 126, connecting plate; 127, hydraulic rod; 128, sliding rod; 13, support frame; 131, screw rod 1; 132, rack 1; 133, back plate 1; 134, guide rod 1; 135, push plate 1; 136, gear 1; 14, connecting rod; 141, support plate; 15, rack 2; 151, screw rod 2; 152, gear 2; 153, guide rod 2; 154, push plate 2; 155, back plate 2. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] The following is combined with Figure 1 -Attached Figure 13 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0039] Example 1: Reference Figures 1-12, a double-limb arch rib bridge structure welding device, including a base 1, the base 1 is stably placed in the welding work area, and when necessary, a pad can be placed on the bottom of the base 1 or expansion screws can be used to stably connect it to the ground, and also includes: columns 11, respectively installed at the four corners of the base 1; two crossbeams 12, respectively slidably set between two adjacent columns 11, and slide plates 111 are fixedly connected to the two ends of the crossbeam 12 respectively, and the slide plates 111 are slidably connected to the columns 11, and a fixing plate 113 is fixedly connected to the columns 11, and a spring 112 is connected between the slide plates 111 and the fixing plates 113, and the spring 112 provides elastic support for the crossbeam 12; a positioning plate 123 is respectively connected to the two crossbeams 12 through a square steel guide rod 122, and the two The positioning plates 123 are relatively arranged, and a positioning end 124 is installed on the positioning plate 123 to limit the web 101. The limit frame 121 is fixedly connected to the crossbeam 12, and four square steel guide rods 122 are slidably connected to the limit frame 121. The ends of the four square steel guide rods 122 are connected with connecting plates 126. A hydraulic rod 127 is connected between the connecting plate 126 and the crossbeam 12. The setting of the hydraulic rod 127 can adjust the expansion and contraction of the square steel guide rod 122, and then adjust the position of the positioning plate 123, so that it is convenient to adjust the position where the web 101 is to be placed. At the same time, after the welding is completed, the positioning end 124 can be detached from the web 101 by the hydraulic rod 127, so that the welded structural parts can be hoisted down conveniently; the web 10 1 is sleeved on the positioning end 124 through the waist-shaped hole 104 to limit the web 101. The positioning pulley 125 is installed on the square steel guide rod 122 to position the two ends of the upper steel pipe 10. When the push plate 135 pushes the upper steel pipe 10, it can make the upper steel pipe 10 slide smoothly. In some embodiments, the positioning pulley 125 is connected to the square steel guide rod 122 by bolts, and the spacing between the symmetrical positioning pulleys 125 can be adjusted by bolts so that the positioning pulley 125 contacts the outer periphery of the upper steel pipe 10; the positioning pulleys 125 are respectively arranged on both sides of the positioning plate 123 to position the two ends of the upper steel pipe 10; the support plates 141 are respectively arranged under the two cross beams 12; the positioning base 103 is respectively It is arranged on the base 1; the lower steel pipe 102 is placed on the positioning base 103 (it should be understood that the positioning base 103 is provided with ball bearings, which can reduce the friction when the lower steel pipe 102 is displaced. At the same time, the surface of the lower steel pipe 102 and the web 101 can be connected by adhering pads on the lower steel pipe 102 or the bottom surface of the web 101, so that a welding seam is retained between the bottom surface of the web 101 and the surface of the lower steel pipe 102), and then the upper steel pipe 10 is placed on the web 101 located on the positioning plate 123. Under the dead weight of the upper steel pipe 10, the beam 12 moves downward and contacts the support plate 141. During the downward movement of the beam 12, the push plates 135 and 154 symmetrically arranged in linkage respectively position the two ends of the upper steel pipe 10 and the lower steel pipe 102.

[0040] A rack 132 is fixedly connected to the support plate 141, and a support frame 13 is symmetrically fixedly connected to the crossbeam 12. A screw rod 131 and a guide rod 134 are respectively connected to the two support frames 13. A gear 136 is threadedly connected to the screw rod 131, and the gear 136 is engaged with the rack 132. A push plate 135 is fixedly connected to the front end of the guide rod 134 and the screw rod 131, and the rear end of the guide rod 134 and the screw rod 131 is fixedly connected to the rear end of the rear plate 133. A slide rod 128 is fixedly connected to the rear plate 133, and the slide rod 128 is slidably connected to the connecting plate 126.

[0041] The columns 11 are fixedly connected with connecting rods 14 . The connecting rods 14 between adjacent columns 11 are connected to the support plates 141 , and a triangle is formed between the adjacent connecting rods 14 and the base 1 .

[0042] The adjacent connecting rods 14 are respectively connected with screw rod 2 151 and guide rod 2 153, and push plate 2 154 is fixedly connected to the front end of screw rod 2 151 and guide rod 2 153. The rear end of screw rod 2 151 and guide rod 2 153 is fixedly connected with rear plate 2 155. Screw rod 2 151 is threadedly connected with gear 2 152, and rack 2 15 is fixedly connected to the crossbeam 12, and gear 2 152 is meshed with rack 2 15.

[0043] Six pressure sensors 120 are installed on the adjacent surfaces of the two positioning plates 123. The six pressure sensors 120 are respectively placed at the four corners of the positioning plates 123 and the middle of the edges of the positioning plates 123 to monitor the force applied by the web 101 to the positioning plates 123 during welding, so as to judge the abnormal stress during welding and select the corresponding cooling method.

[0044] When the device is in use, the two webs 101 are sleeved on the positioning end 124, and the lower steel pipe 102 is placed stably on the positioning base 103. The positioning base 103 is used to preliminarily position the lower steel pipe 102, and then the upper steel pipe 10 is placed on the web 101 located on the positioning plate 123. The weight of the upper steel pipe 10 will cause the crossbeam 12 to move downward until the crossbeam 12 contacts the support plate 141.

[0045] When the crossbeam 12 moves downward, the gear 136 will mesh and rotate with the rack 132. The rotation of the gear 136 will cause the screw 131 to move horizontally, and the push plate 135 will contact the two ends of the upper steel pipe 10, and then the two ends of the upper steel pipe 10 will be positioned by the push plate 135, and the position of the upper steel pipe 10 on the web 101 will be corrected; wherein, the upper steel pipe 10 is mounted on the positioning pulley 125, which reduces the friction resistance of the upper steel pipe 10 when it moves horizontally. At the same time, the setting of the positioning pulley 125 can also leave a welding seam between the outer periphery of the upper steel pipe 10 and the upper end of the web 101, which is convenient for welding.

[0046] When the crossbeam 12 moves downward, it will drive the rack 2 15 connected to the crossbeam 12 to move downward, and the downward movement will cause the gear 2 152 to engage and rotate, driving the screw 2 151 to move horizontally, so that the symmetrically arranged push plates 2 154 will contact the two ends of the lower steel pipe 102, and correct the position of the lower steel pipe 102. At this time, the upper steel pipe 10, the web 101, and the lower steel pipe 102 reach the position required by the design.

[0047] Since the web 101 is sleeved on the positioning end 124, the web 101 can be prevented from shaking or displacement during the welding process. At the same time, the upper steel pipe 10 and the lower steel pipe 102 are clamped by the corresponding push plate 135 and the push plate 2 154, which can also reduce the risk of shaking during the welding process.

[0048] Therefore, by limiting the web 101 with the positioning end 124, positioning the ends of the upper steel tube 10 with the positioning pulley 125, and positioning the ends of the upper steel tube 10 and lower steel tube 102 with the linkage push plate 135 and push plate 2 154 during the downward movement of the crossbeam 12, precise positioning of the various components of the double-limbed arch rib bridge structure is achieved. Accurate positioning effectively reduces welding deviations, ensures uniformity and consistency of the weld, thereby improving the strength and stability of the welded joint, enhancing the overall welding quality, and ensuring the safety and reliability of the bridge structure.

[0049] At the same time, during the downward movement of the crossbeam 12, the upper steel pipe 10 and the lower steel pipe 102 are positioned by automatically linking the push plate 1 135 and the push plate 2 154, without the need for additional manual positioning operations, reducing the intervention of manual adjustments and improving the efficiency and accuracy of positioning.

[0050] Reference Figure 13 The side plates can be welded by hoisting, or the upper steel pipe 10, the lower steel pipe 102, and the web 101 can be hoisted down and then welded.

[0051] Example 2: Reference Figure 5 , a double-limb arch rib bridge structural member welding device, which is basically the same as Example 1, and further, cooling air grooves 1241 are opened at the upper and lower ends of the positioning end 124.

[0052] A circular cooling passage 1231 is defined in the positioning plate 123 .

[0053] There are four square steel guide rods 122 on one side, namely square steel tube one 1221, square steel tube two 1222, and two square steel tube threes 1223. Square steel tube one 1221 and square steel tube two 1222 are respectively connected to the two ends of the circular cooling passage 1231, and the two square steel tube threes 1223 are both connected to the inside of the positioning end 124 (it should be understood that the positioning end 124 is hollow), and are connected to the two square steel tube threes 1223 through an external air pump connecting pipe. The liquid inlet connecting pipe of the external liquid cooling equipment is connected to square steel tube one 1221, and the liquid outlet connecting pipe is connected to square steel tube two 1222.

[0054] During the welding process, the web 101 is easily heated and generates stress, which may cause the position of the web 101 to change or distort. Therefore, during the welding process, six pressure sensors 120a, 120b, 120c, 120d, 120e, and 120f installed on the adjacent surfaces of the positioning plate 123 monitor the force exerted by the web 101 on the positioning plate 123 in real time. When the data from the pressure sensors 120 show different conditions, the cooling system starts the corresponding operation according to the preset rules. The cooling method used is as follows:

[0055] S1. When the pressures of three pressure sensors in any group of pressure sensors 120b, 120d, and 120f or pressure sensors 120a, 120c, and 120e all exceed the set threshold, indicating that stress concentration has occurred locally in an area on one side of the web 101, the cooling air slot 1241 is activated at power 1 (power 1 is 50% of the total operating power of the external air pump) to dissipate heat. By supplying cooling air to the welds (the welds between the web 101 and the upper and lower steel pipes 10, 102), the local heat is removed and the temperature of the area is lowered.

[0056] S2. When the pressures of the pressure sensors 120a, 120b, 120c, 120d, 120e, and 120f all exceed the set thresholds, the stress and heat of the entire web 101 may be too high. At this time, the power of the cooling air slot 1241 and the serpentine cooling passage 1231 are activated to dissipate heat. The serpentine cooling passage 1231 can take away the heat of the web 101 through the positioning plate 123, thereby taking away more heat, reducing the heat around the web 101, reducing the welding current by 10%-15%, and reducing the welding speed by 20%-30%, thereby reducing the heat generated per unit time and avoiding deformation of structural parts or welding defects due to heat accumulation;

[0057] S3. When the pressures of all pressure sensors in any group of pressure sensors 120a, 120b, 120e, 120f or pressure sensors 120c, 120d exceed the set threshold, this means that the middle part of the web 101 is bent, causing the middle part of the web 101 to bulge close to or away from the positioning plate 123, indicating that there is a serious risk of stress concentration and heat accumulation in the web 101 during welding. At this time, power 2 of the cooling air trough 1241 (power 2 is 80% of the total working power of the external air pump) and the circular cooling passage 1231 are activated for heat dissipation, and welding is stopped to increase the cooling efficiency. A level 3 red alarm is issued to remind the operator that there is an abnormality in the welding area and that it needs to be checked and handled in time.

[0058] After the welding task is completed, the operator turns off the welding equipment, external air pump, and external liquid cooling equipment. As the upper steel pipe 10 is removed, the crossbeam 12 returns upward under the elastic restoring force of the spring 112. The push plate 135 and push plate 2 154 return to their initial positions under the drive of the screw rod 131 and screw rod 2 151 and the guide rod 134 and guide rod 2 153, waiting for the next welding task.

[0059] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been described above with reference to a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A double-limb arch rib bridge structural member welding device, comprising a base (1), characterized in that: Also includes: Columns (11) are respectively installed at the four corners of the base (1); Two crossbeams (12) are respectively slidably arranged between two adjacent columns (11); The positioning plates (123) are connected to the two beams (12) respectively through square steel guide rods (122), and the two positioning plates (123) are arranged opposite to each other. Positioning ends (124) are installed on the positioning plates (123) to limit the web (101); Positioning pulleys (125) are respectively arranged on both sides of the positioning plate (123) to position the two ends of the upper steel pipe (10); Support plates (141) are respectively arranged under the two crossbeams (12); Positioning bases (103) are respectively arranged on the base (1); The lower steel pipe (102) is placed on the positioning base (103), and the upper steel pipe (10) is placed on the web (101) located on the positioning plate (123). Under the weight of the upper steel pipe (10), the crossbeam (12) moves downward and contacts the support plate (141). During the downward movement of the crossbeam (12), the push plate 1 (135) and the push plate 2 (154) that are symmetrically arranged in linkage are respectively positioned at both ends of the upper steel pipe (10) and the lower steel pipe (102); Six pressure sensors (120) are respectively installed on adjacent surfaces of the two positioning plates (123), and the six pressure sensors (120) are respectively placed at the four corners of the positioning plates (123) and the middle of the edges of the positioning plates (123) to monitor the force applied by the web (101) to the positioning plates (123) during welding, so as to judge abnormal stress during welding and select a corresponding cooling method; The upper and lower ends of the positioning end head (124) are both provided with cooling air slots (1241); A circular cooling passage (1231) is provided in the positioning plate (123).

2. A double-limb arch rib bridge structural member welding device according to claim 1, characterized in that: Both ends of the crossbeam (12) are fixedly connected to slide plates (111), the slide plates (111) are slidably connected to the upright posts (11), a fixed plate (113) is fixedly connected to the upright posts (11), and a spring (112) is connected between the slide plates (111) and the fixed plate (113).

3. The double-limb arch rib bridge structural member welding device according to claim 1, characterized in that: A limit frame (121) is fixedly connected to the crossbeam (12), and the four square steel guide rods (122) are slidably connected to the limit frame (121). The ends of the four square steel guide rods (122) are connected to a connecting plate (126), and a hydraulic rod (127) is connected between the connecting plate (126) and the crossbeam (12).

4. The double-limb arch rib bridge structural member welding device according to claim 3, characterized in that: The support plate (141) is fixedly connected with a rack (132), the crossbeam (12) is symmetrically fixedly connected with a support frame (13), the two support frames (13) are respectively connected with a screw rod (131) and a guide rod (134), the screw rod (131) is threadedly connected with a gear (136), the gear (136) is meshed with the rack (132), the push plate (135) is fixedly connected to the front end of the guide rod (134) and the screw rod (131), the rear end of the guide rod (134) and the screw rod (131) is fixedly connected with a rear plate (133), the rear plate (133) is fixedly connected with a slide rod (128), and the slide rod (128) is slidably connected to the connecting plate (126).

5. The double-limb arch rib bridge structural member welding device according to claim 3, characterized in that: The columns (11) are fixedly connected with connecting rods (14), and the connecting rods (14) between adjacent columns (11) are connected to the support plate (141), so that a triangle is formed between the adjacent connecting rods (14) and the base (1).

6. The double-limb arch rib bridge structural member welding device according to claim 5, characterized in that: The adjacent connecting rods (14) are respectively connected with screw rod 2 (151) and guide rod 2 (153), the push plate 2 (154) is fixedly connected to the front ends of screw rod 2 (151) and guide rod 2 (153), the rear ends of screw rod 2 (151) and guide rod 2 (153) are fixedly connected with rear plate 2 (155), the screw rod 2 (151) is threadedly connected with gear 2 (152), the crossbeam (12) is fixedly connected with rack 2 (15), and the gear 2 (152) is meshed with rack 2 (15).

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