Composite beam for supporting bridge, underframe for assembling composite beam and assembling method

Abstract

The invention relates to the technical field of bridge construction, in particular to a composite beam for bridge supporting, an underframe for assembling the composite beam and an assembling method. Comprising a bottom plate unit, web plate units, a plurality of fulcrum partition plate units, an open-web type partition plate unit and a cantilever arm, the bottom plate unit comprises a bottom plate and a first partition plate, the first partition plate is arranged in the transverse direction of the bottom plate, the web plate units are oppositely and obliquely arranged on the two sides of the bottom plate unit, and each web plate unit comprises a web plate, a second partition plate and a third partition plate; the second partition plate and the third partition plate are fixed to the inner side of the web, the lower end of the second partition plate makes contact with the upper side face of the bottom plate, the lower end of the third partition plate makes contact with the upper side face of the first partition plate, and the fulcrum partition plate units are arranged on the bottom plate at intervals. The web units on the two sides of the bottom plate unit are fixedly connected with the multiple fulcrum partition plate units and the open-web partition plate units fixed to the upper end of the bottom plate unit, the structural stability is higher, and durability is good.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a composite beam for bridge support, a chassis for assembling the composite beam, and an assembling method. Background Art

[0002] The composite structure bridge is a reasonable structure system that can give full play to the performance advantages of various materials. Among them, the steel beam-concrete bridge deck is a relatively common composite form. This composite structure bridge is a composite structure system in which the concrete bridge deck and the steel beam are prefabricated in the factory and then transported to the construction site for rapid assembly. This composite structure can reduce the formwork and concrete pouring operations at the construction site and shorten the construction time of the bridge.

[0003] For the existing assembled composite beam, the bearing capacity at the connection is poor, and it will be deformed and damaged under long-term pressure load, and the later maintenance is difficult, which increases the production cost.

[0004] At the same time, on the turning section of the bridge, a certain slope is set on the bridge deck, so that the bridge deck forms a state where the outside is high and the inside is low. The upper and lower end faces of the composite beam matching the bridge deck at this position need to present a state matching the bridge deck. This requires that the bottom plate unit of the composite beam presents a certain inclination during assembly.

[0005] Most of the existing chassis for assembling the composite beam can only play a supporting role. When the bottom plate unit needs to present a certain inclination, a transverse plate is mostly padded on the chassis. On the one hand, the accuracy cannot be controlled and there are errors. On the other hand, when the bottom plate unit is high on one side and low on the other side, there will be a gap in the middle and there is a lack of support points, which affects the assembly strength of the composite beam during assembly. Summary of the Invention

[0006] In order to solve the problem that the bearing capacity at the connection of the existing assembled composite beam is poor, the present invention provides a composite beam for bridge support with high strength and strong durability; in order to solve the problem that most of the existing chassis for assembling the composite beam can only play a supporting role and cannot effectively and accurately adjust the inclination of the bottom plate unit, the present invention provides a chassis for assembling the composite beam and an assembling method for the composite beam that can accurately adjust the inclination of the bottom plate unit.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: A composite beam for bridge support, comprising a bottom plate unit, a web unit, a plurality of fulcrum partition units, a cellular partition unit and a cantilever. The bottom plate unit includes a bottom plate and a first partition. The first partition is arranged transversely along the bottom plate. The web units are arranged obliquely on both sides of the bottom plate unit. The web unit includes a web, a second partition and a third partition. Both the second partition and the third partition are fixed to the inner side of the web. The lower end of the second partition contacts the upper side of the bottom plate, and the lower end of the third partition contacts the upper side of the first partition. The plurality of fulcrum partition units are arranged on the bottom plate at intervals. The fulcrum partition unit includes a fulcrum partition fixed to the bottom plate. Both sides of the fulcrum partition are fixedly connected to the web. A plurality of cellular partition units are arranged between adjacent fulcrum partition units. The cellular partition unit includes a fourth partition and an inclined support in a shape of an inverted V. Both ends of the fourth partition are fixedly connected to the end faces of the third partition. One end of the inclined support is fixed to the fourth partition, and the other end is connected and fixed to the first partition and the third partition. The cantilever is fixed to the outer side of the web. A plurality of cantilevers are respectively located on both sides of each fulcrum partition and the fourth partition. The web units on both sides of the bottom plate unit are fixedly connected to the plurality of fulcrum partition units and the cellular partition units fixed to the upper end of the bottom plate unit, with stronger structural stability and better durability.

[0008] Further, the bottom plate unit further includes a plurality of bottom plate ribs arranged longitudinally along the bottom plate, and the bottom plate ribs penetrate through the first partition.

[0009] Further, cushion plates are fixedly arranged on the upper end faces of the first partition, the second partition and the third partition.

[0010] Further, the web unit further includes a first flange fixed to the upper end of the web. The upper ends of both the second partition and the third partition contact the first flange.

[0011] Further, second flanges are fixed to the upper ends of both the fulcrum partition and the fourth partition. The first flange and the second flange cooperate to expand the contact area between the bridge on the upper end of the support composite beam and the composite beam, thereby improving the stability of the bridge.

[0012] Further, the cantilever is flush with the upper end faces of the first flange and the second flange. The upper end of the cantilever contacts the first flange, and the end of the second flange contacts the first flange.

[0013] By the above technical solutions, the beneficial effects of the present invention are as follows: 1. On both sides of the bottom plate of the present invention, webs are fixed. The lower end of the fulcrum partition is fixedly connected to the bottom plate, and both sides of the fulcrum partition are fixedly connected to the webs, fixing the fulcrum partition unit, the bottom plate unit and the web unit into an integral whole. At the same time, both ends of the fourth partition are fixedly connected to the third partition, realizing the connection and fixation of the open-web partition unit and the web unit. The inclined support fixed to the lower part of the fourth partition is connected and fixed to the first partition and the third partition, realizing the fixation of the open-web partition unit, the bottom plate unit and the web unit into an integral whole, ensuring the strength and service life of the composite beam.

[0014] 2. The first flange on the web of the present invention is combined with the second flange and the cantilever fixed to the upper ends of the fulcrum partition and the fourth partition, expanding the contact area between the bridge at the upper end of the support composite beam and the upper surface of the composite beam, thereby improving the stability of the bridge placed on the composite beam.

[0015] The present invention also provides a chassis for assembling a composite beam, which is used to support the composite beam for bridge support described above, and includes a base, a plurality of telescopic mechanisms and support frames. The telescopic mechanisms are located between the base and the bottom plate, and the output ends of the plurality of telescopic structures are in contact with the lower side of the bottom plate. The plurality of support frames are respectively located outside the webs and in contact with the side surfaces of the webs.

[0016] Further, the telescopic mechanism includes a column tube, a nut and a screw rod. The column tube is hollow and has an upper opening. The nut is fixed to the upper end of the column tube, and the lower end of the screw rod extends into the column tube and is threadedly connected to the nut.

[0017] Further, a support plate is fixed to the upper end of the support frame, and the upper end of the support plate contacts the lower end surface of the cantilever.

[0018] Through the above technical solutions, the beneficial effects of the present invention are as follows: The present invention is provided with a plurality of telescopic mechanisms and support frames on the base. The plurality of telescopic mechanisms are arranged in multiple rows longitudinally along the base, and each row of telescopic mechanisms is evenly arranged transversely along the base. The upper ends of each row of telescopic mechanisms are connected into a straight line inclined at a certain angle after adjustment, ensuring the inclination accuracy of the bottom plate. When the bottom plate is placed on the plurality of telescopic mechanisms, the stability of the bottom plate during the assembly of the composite beam can be ensured; at the same time, the support frame can limit the two sides of the bottom plate during the assembly of the composite beam and can also support the web unit, ensuring the structural strength of the web unit when it is fixed to the bottom plate unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a composite beam assembled on the chassis for assembling a composite beam of the present invention; Figure 2 For the present invention Figure 1 The enlarged structural view of part A in Figure 3 is a schematic structural diagram of a composite beam for bridge support of the present invention; Figure 4 Schematic structural diagram of the bottom plate unit of the present invention; Figure 5 Schematic structural diagram of the web unit of the present invention; Figure 6 Schematic structural diagram of the open-web diaphragm unit of the present invention; Figure 7 Schematic structural diagram of the cantilever of the present invention; Figure 8 Schematic structural diagram of the chassis for assembling the composite beam of the present invention; Figure 9 Schematic structural diagram of the telescopic mechanism of the present invention Figure 1 ; Figure 10 Schematic structural diagram of the telescopic mechanism of the present invention Figure 2 .

[0020] Reference numerals in the drawings: 1 is the bottom plate unit, 11 is the bottom plate, 12 is the first partition plate, 13 is the bottom plate rib, 14 is the backing plate; 2 is the web unit, 21 is the web, 22 is the second partition plate, 23 is the third partition plate, 24 is the first flange, 25 is the stiffening rib; 3 is the fulcrum partition unit, 31 is the fulcrum partition, 32 is the second flange, 33 is the first stiffening plate, 34 is the second stiffening plate, 35 is the manhole, 36 is the fulcrum stiffening plate; 4 is the open-web diaphragm unit, 41 is the fourth partition plate, 42 is the diagonal brace, 43 is the gusset plate, 44 is the third stiffening plate; 5 is the cantilever, 71 is the base, 72 is the support frame, 73 is the support plate, 8 is the telescopic mechanism, 81 is the column pipe, 82 is the nut, 83 is the screw rod, 84 is the snap ring, 85 is the through hole. Detailed implementation manners

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners: Example 1 As Figures 1 to 7 shown, this example provides a composite beam for bridge support, including a bottom plate unit 1, a web unit 2, a fulcrum partition unit 3, an open-web diaphragm unit 4, and cantilevers 5 arranged oppositely; Referring to Figure 3 and Figure 4 , the bottom plate unit 1 includes a bottom plate 11 and a plurality of first partition plates 12 arranged horizontally along the bottom plate 11. The plurality of first partition plates 12 are evenly arranged on the bottom plate 11 and there is a gap between two adjacent first partition plates 12.

[0022] The bottom plate unit 1 further includes a plurality of bottom plate ribs 13 arranged longitudinally along the bottom plate 1. The plurality of bottom plate ribs 13 are evenly arranged on the bottom plate 11 with a gap between two adjacent bottom plate ribs 13. The bottom plate ribs 13 pass through the first partition plate 12, and a cushion plate 14 is fixed on the upper end surface of the first partition plate 12. The bottom plate ribs 13 and the first partition plate 12 are perpendicular to each other.

[0023] Reference Figure 3 And Figure 5 , the web units 2 are arranged obliquely relative to each other on both sides of the bottom plate unit 1. The web unit 2 includes a web 21, a second partition plate 22 and a third partition plate 23. In this embodiment, the web unit 2 includes one web 21, three second partition plates 22 and two third partition plates 23. A third partition plate 23 is arranged between two adjacent second partition plates 22, and there is a gap between the adjacent second partition plate 22 and the third partition plate 23. The third partition plate 23 corresponds to the first partition plate 12.

[0024] Both the second partition plate 22 and the third partition plate 23 are fixed to the inner side of the web 21. The lower end of the second partition plate 22 contacts the upper side surface of the bottom plate 11, and the lower end of the third partition plate 23 contacts the upper side surface of the first partition plate 12. Cushion plates 14 are fixedly arranged on the upper end surfaces of the second partition plate 22 and the third partition plate 23.

[0025] Webs 21 are welded and fixed to both sides of the bottom plate 11. The lower ends of the second partition plates 22 on the webs 21 are welded and fixed to the upper side surface of the bottom plate 11. The lower ends of the third partition plates 23 on the webs 21 are welded and fixed to the cushion plates 14 on the upper end surface of the first partition plate 12. Both ends of the first partition plate 12 are welded and fixed to the web 32.

[0026] The web unit 2 further includes a first flange 24 fixed to the upper end of the web 21. The upper ends of the second partition plate 22 and the third partition plate 23 both contact the first flange 24.

[0027] Reference Figure 1 And Figure 2 , a plurality of the fulcrum partition units 3 are arranged at intervals on the bottom plate 11. The fulcrum partition unit 3 includes a fulcrum partition 31 fixed to the bottom plate 11. Both sides of the fulcrum partition 31 are fixedly connected to the web 21. A second flange 32 is fixed to the upper end of the fulcrum partition 31.

[0028] Specifically, the fulcrum partition plate 31 is in the shape of an inverted isosceles trapezoid, and its lower end surface is fixed on the bottom plate 11. The bottom plate rib 13 passes through the fulcrum partition plate 31. A horizontal first stiffening plate 33 is welded on the fulcrum partition plate 31. The two ends of the first stiffening plate 33 are respectively welded and fixed to the webs 21 on both sides of the bottom plate 11. Two vertical second stiffening plates 34 are welded on the fulcrum partition plate 31. The upper ends of the second stiffening plates 34 are welded and fixed to the second flange 32, and the lower ends are welded and fixed to the first stiffening plate 33. A plurality of vertical fulcrum stiffening plates 36 are also welded on the fulcrum partition plate 31. The upper ends of the fulcrum stiffening plates 36 are welded and fixed to the second flange 32, and the lower ends pass through the first stiffening plate 33 and are welded and fixed to the bottom plate 11, welding and fixing the fulcrum partition plate unit 3 with the bottom plate unit 1 and the web unit 2 into a whole, improving the strength and service life of the composite beam.

[0029] Meanwhile, a manhole 35 is provided on the fulcrum partition plate 31 to facilitate the maintenance by the staff.

[0030] Reference Figure 1 、 Figure 3 And Figure 6 , a plurality of open-web partition units 4 are provided between adjacent fulcrum partition plate units 3 (only one fulcrum partition plate unit 3 is shown in Figure 1 ). The open-web partition unit 4 includes a fourth partition plate 41 and an inclined support 42 in the shape of an inverted V. The two ends of the fourth partition plate 41 are fixedly connected to the end faces of the third partition plate 23. One end of the inclined support 42 is fixed on the fourth partition plate 41, and the other end is connected and fixed to the first partition plate 12 and the third partition plate 23. The upper end of the fourth partition plate 41 is fixed with the second flange 32.

[0031] Specifically, backing plates 14 are fixedly arranged on the upper end faces of the second partition plate 22 and the third partition plate 23. The two ends of the fourth partition plate 41 are respectively welded and fixed to the backing plates 14 on one side of the third partition plate 23 on both sides of the web unit 2 of the bottom plate unit 1. One side of the inclined support 42 in the shape of an inverted V is welded by using two opposite channel steels. The upper ends of the two channel steels are welded and fixed to the middle of the fourth partition plate 41, and the lower ends are welded and fixed to the gusset plate 43 welded and fixed to the first partition plate 12 and the third partition plate 23, making the open-web partition unit 4 welded and fixed with the bottom plate unit 1 and the web unit 2 into a whole, improving the strength and service life of the composite beam.

[0032] Meanwhile, it should be understood that the two ends of the fourth partition plate 41 in the open-web partition unit 4 are fixed on the third partition plate 23 of the web unit 2. And the number of open-web partition units 4 on one bottom plate unit 1 is mostly 2 - 3. Therefore, the number of the third partition plates 23 on one web unit 2 is also mostly 2 - 3, while the number of the second partition plates 22 is more than 3. And the lower end of the inclined support 42 in the open-web partition unit 4 is connected and fixed to the first partition plate 12 and the third partition plate 23. Therefore, the number of the first partition plates 12 on the bottom plate 11 is also corresponding to the number of the open-web partition units 4.

[0033] In summary, by welding and fixing the fulcrum partition unit 3 and the open-web partition unit 4 to the bottom plate unit 1 and the web unit 2 as a whole, the strength and service life of the composite beam are improved. At the same time, the support structure of the open-web partition unit 4 makes the space inside the composite beam relatively spacious, facilitating the maintenance and repair of the composite beam in the later stage.

[0034] Reference Figure 1 、 Figure 3 and Figure 7 , the cantilever 5 is fixed to the outside of the web 21, and multiple cantilevers 5 are respectively located on both sides of each fulcrum partition 31 and the fourth partition 41.

[0035] The cantilever 5 is flush with the upper end surfaces of the first flange 24 and the second flange 32. The upper end of the cantilever 5 contacts the first flange 24, and the end of the second flange 32 contacts the first flange 24. The cooperation of the first flange 24, the second flange 32 and the cantilever 5 expands the contact area between the bridge supporting the upper end of the composite beam and the composite beam, thereby improving the stability of the bridge placed on the composite beam.

[0036] After the composite beam is welded in the factory, it is directly transported to the bridge erection site, and then placed on the pier by means of hoisting and welded and fixed.

[0037] Embodiment 2 As Figure 1 、 Figures 8 to 10 shown, this embodiment provides a chassis for assembling a composite beam, which is used to support the composite beam for bridge support, including a base 71, a plurality of telescopic mechanisms 8 and a support frame 72. The telescopic mechanisms 8 are located between the base 71 and the bottom plate 11, and the output ends of the plurality of telescopic structures 8 contact the lower side surface of the bottom plate 11. The plurality of support frames 72 are respectively located outside the web 21 and contact the side surface of the web 21.

[0038] The plurality of support frames 72 are grouped in twos, and multiple groups of support frames 72 are arranged at intervals along the longitudinal direction of the base 71. The two support frames 72 in each group are symmetrically arranged on both sides of the base 71, and a row of telescopic mechanisms 8 is arranged between the two support frames 72 in each group.

[0039] Reference Figure 1 , a plurality of rows of telescopic mechanisms 8 are arranged along the longitudinal direction of the base 71. Each row of telescopic mechanisms 8 has 4 and is evenly arranged along the transverse direction of the base 71, and the upper ends of the telescopic mechanisms 8 all contact the lower side surface of the bottom plate 11 of the composite beam.

[0040] In order to make the bottom plate 11 maintain a certain inclination at the beginning, it is necessary to adjust the telescopic mechanism 8. The upper ends of the 4 telescopic mechanisms 8 in each row are connected into a straight line inclined at a certain angle after adjustment, and multiple rows of telescopic mechanisms 8 are adjusted uniformly to ensure the stability of the bottom plate 11 during the assembly of the composite beam.

[0041] Reference Figure 8 and Figure 9 The telescopic mechanism 8 includes a column tube 81, a nut 82, and a screw rod 83. The column tube 81 is hollow and open at the upper end. The nut 82 is fixed to the upper end of the column tube 81. The lower end of the screw rod 83 extends into the column tube 81 and is threadedly connected to the nut 82. A snap ring 84 is also threadedly connected to the screw rod 83 to fix the position of the screw rod 83. A tube plate is fixed to the lower part of the column tube 81, and the tube plate is welded and fixed to the base 71. By rotating the screw rod 83, the screw rod 83 can be lifted and lowered in the column tube 81 for adjustment. At the same time, a through hole 85 is provided at the upper end of the screw rod 83, which is convenient for later staff to adjust.

[0042] The upper end of the support frame 72 is fixed with a support plate 73, and the upper end of the support plate 73 contacts the lower end surface of the cantilever 5 to support and stabilize the welding and fixing of the cantilever 5.

[0043] The assembling method for assembling the composite beam by using the underframe for composite beam assembling includes the following steps: Step 1: Adjust the elongation of each telescopic mechanism 8 on the base 71 so that the bottom plate 11 is inclined and placed on the upper ends of the plurality of telescopic mechanisms 8 on the base 71, and the upper side of the bottom plate 11 contacts the upper ends of each telescopic mechanism 8.

[0044] The bottom plate 11 is placed at the ends of the plurality of telescopic mechanisms 8 in a hoisting manner. Before placing the bottom plate 11, it is necessary to adjust the height of the telescopic mechanism 8. The upper ends of 4 telescopic mechanisms 8 in each row are connected into a straight line inclined at a certain angle after adjustment, and multiple rows of telescopic mechanisms 8 are adjusted to be consistent. At this time, the bottom end of the web unit 2 on one side of the bottom plate 11 is higher than the bottom end of the web unit 2 on the other side of the bottom plate 11.

[0045] Step 2: Place a web unit 2 on one side of the bottom plate 11. The outer side of the web 21 in the web unit 2 contacts the side surface of the support frame 72, and the web unit 2 is connected and fixed to the bottom plate 11.

[0046] Weld and fix a web unit 2 to the bottom plate 11. Weld and fix the lower end of the second partition 22 on the web 21 to the upper side surface of the bottom plate 11. Weld and fix the lower end of the third partition 23 on the web 21 to the backing plate 14 on the upper end surface of the first partition 12. One end of the first partition 12 is welded and fixed to one side web 32.

[0047] Step 3: Connect and fix a plurality of fulcrum partition units 3 and open-web partition units 4 to the bottom plate 11 and the web unit 2.

[0048] Fix the lower end face of the fulcrum partition plate 31 on the bottom plate 11. The bottom plate rib 13 passes through the through groove formed in the lower part of the fulcrum partition plate 31, and weld and fix the end of the first stiffening plate 33 welded on the fulcrum partition plate 31 to the web 21 on one side of the bottom plate 11. Weld and fix the upper ends of multiple vertical fulcrum stiffening plates 36 welded on the fulcrum partition plate 31 to the second flange 32, and the lower ends pass through the first stiffening plate 33 and are welded and fixed to the bottom plate 11. Then weld and fix the fulcrum partition plate unit 3, the bottom plate unit 1 and the web unit 2 on one side into a whole.

[0049] Weld and fix one end of the fourth partition plate 41 to the backing plate 14 on one side of the web unit 2 of the bottom plate unit 1 and on one side of the third partition plate 23. Weld and fix the upper end of the inclined support 42 in a shape of an inverted V to the middle of the fourth partition plate 41, and the lower end is welded and fixed to the gusset plate 43 welded and fixed to the first partition plate 12 and the third partition plate 23, so that the open-web partition plate unit 4, the bottom plate unit 1 and the web unit 2 on one side are welded and fixed into a whole.

[0050] Step 4: Place another web unit 2 on the other side of the bottom plate 11. The outer side of the web 21 in the web unit 2 contacts the side surface of the support frame 71. Connect and fix the web unit 2 to the bottom plate 11, multiple fulcrum partition plates 31 and the fourth partition plate 41. Then weld the web unit 2 on the other side, the open-web partition plate unit 4 and the bottom plate unit 1 into a whole. The specific steps can refer to Step 2 and Step 3.

[0051] Step 5: Fix the cantilever 5 on the outer side of the web 21. First, lift the cantilever 5 to the upper side of the support plate 73, and then weld the cantilever 5 on the outer side of the web 21.

[0052] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent shall be included in the scope of the patent application of the present invention.

Claims

1. A composite beam for bridge support, characterized in that, It includes a bottom plate unit (1), a web unit (2), a plurality of fulcrum partition units (3), a cellular partition unit (4) and a cantilever (5); The bottom plate unit (1) includes a bottom plate (11) and a first partition plate (12), and the first partition plate (12) is arranged along the transverse direction of the bottom plate (11); The web units (2) are relatively inclined and arranged on both sides of the bottom plate unit (1). The web unit (2) includes a web (21), a second partition plate (22) and a third partition plate (23). Both the second partition plate (22) and the third partition plate (23) are fixed to the inner side of the web (21). The lower end of the second partition plate (22) contacts the upper side of the bottom plate (11), and the lower end of the third partition plate (23) contacts the upper side of the first partition plate (12); A plurality of the fulcrum partition units (3) are arranged on the bottom plate (11) at intervals. The fulcrum partition unit (3) includes a fulcrum partition plate (31) fixed to the bottom plate (11), and both sides of the fulcrum partition plate (31) are fixedly connected to the web (21); A plurality of cellular partition units (4) are provided between adjacent fulcrum partition units (3). The cellular partition unit (4) includes a fourth partition plate (41) and an inclined support (42) in an inverted V shape. Both ends of the fourth partition plate (41) are fixedly connected to the end faces of the third partition plate (23). One end of the inclined support (42) is fixed to the fourth partition plate (41), and the other end is connected and fixed to the first partition plate (12) and the third partition plate (23); The cantilever (5) is fixed to the outside of the web (21), and a plurality of cantilevers (5) are respectively located on both sides of each fulcrum partition plate (31) and the fourth partition plate (41).

2. The composite beam for bridge support according to claim 1, characterized in that, The bottom plate unit (1) further includes a plurality of bottom plate ribs (13) arranged along the longitudinal direction of the bottom plate (1). The bottom plate ribs (13) pass through the first partition plate (12).

3. The composite beam for bridge support according to claim 1, characterized in that, Padding plates (14) are fixedly arranged on the upper end faces of the first partition plate (12), the second partition plate (22) and the third partition plate (23).

4. The composite beam for bridge support according to claim 1, wherein, The web unit (2) further includes a first flange (24) fixed to the upper end of the web (21). The upper ends of the second partition plate (22) and the third partition plate (23) both contact the first flange (24).

5. The composite beam for bridge support according to claim 4, characterized in that, Second flanges (32) are fixed to the upper ends of the fulcrum partition plate (31) and the fourth partition plate (41).

6. The composite beam for bridge support according to claim 5, wherein The upper end surfaces of the cantilever (5), the first flange (24) and the second flange (32) are flush. The upper end of the cantilever (5) contacts the first flange (24), and the end of the second flange (32) contacts the first flange (24).

7. Underframe for assembling composite beams, characterized in that, A combined beam for bridge support according to any one of claims 1-6 for support, includes a base (71), a plurality of telescopic mechanisms (8) and a support frame (72). The telescopic mechanisms (8) are located between the base (71) and the bottom plate (11). The output ends of a plurality of telescopic structures (8) contact the lower side of the bottom plate (11). A plurality of support frames (72) are respectively located on the outside of the web (21) and contact the side surface of the web (21).

8. The underframe for assembling the composite beam according to claim 7, characterized in that, The telescopic mechanism (8) includes a column tube (81), a nut (82), and a screw rod (83). The column tube (81) is hollow and open at the upper end. The nut (82) is fixed to the upper end of the column tube (81). The lower end of the screw rod (83) extends into the column tube (81) and is threadedly connected to the nut (82).

9. The underframe for assembling composite beams according to claim 7, characterized in that, A support plate (73) is fixed to the upper end of the support frame (72), and the upper end of the support plate (73) contacts the lower end surface of the cantilever (5).

10. Method for assembling composite beam, characterized in that It is realized by the composite beam for bridge support according to any one of claims 1-6 and the bottom frame for assembling the composite beam according to any one of claims 7-9, and includes the following steps: Step 1: Adjust the elongation of each telescopic mechanism (8) on the base (71) so that the bottom plate (11) is placed obliquely on the upper ends of the plurality of telescopic mechanisms (8) of the base (71), and the upper side surface of the bottom plate (11) contacts the upper ends of each telescopic mechanism (8). Step 2: Place the web unit (2) on one side of the bottom plate (11). The outer side of the web (21) in the web unit (2) contacts the side surface of the support frame (72), and the web unit (2) is fixedly connected to the bottom plate (11). Step 3: Fix the plurality of support point partition units (3) and the open-web partition units (4) to the bottom plate (11) and the web unit (2). Step 4: Place the web unit (2) on the other side of the bottom plate (11). The outer side surface of the web (21) in the web unit (2) contacts the side surface of the support frame (71), and the web unit (2) is fixedly connected to the bottom plate (11), the plurality of support point partitions (31), and the fourth partition (41). Step 5: Fix the cantilever (5) to the outer side of the web (21).

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