Composite beam and assembly underframe for supporting composite beam

Abstract

The utility model relates to the technical field of bridge construction, in particular to a composite beam and an assembly underframe for supporting the composite beam. 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] This utility model relates to the field of bridge construction technology, and in particular to a composite beam and an assembly base frame for supporting the composite beam. Background Technology

[0002] Composite bridge structures are rational structural systems that fully utilize the advantages of various material properties, with steel beams and concrete decks being a common combination. This type of composite bridge involves prefabricating concrete decks and steel beams in a factory, then transporting them to the construction site for rapid assembly. This composite structure reduces on-site formwork and concrete pouring work, shortening bridge construction time.

[0003] Existing prefabricated composite beams have poor load-bearing capacity at the joints, and will deform and be damaged under long-term pressure loads, making later repairs difficult and increasing production costs.

[0004] Meanwhile, on the curved sections of the bridge, the bridge deck will have a certain slope, resulting in a higher outer side and a lower inner side. The upper and lower end faces of the composite beam that mates with the bridge deck at this location must match the bridge deck. This requires that the bottom plate unit of the composite beam be tilted to a certain extent during assembly.

[0005] Most existing composite beam assembly base frames can only serve a supporting function. When the base plate unit needs to have a certain inclination, most of them simply place a horizontal plate on the base frame. On the one hand, it is impossible to control the accuracy and there are errors. On the other hand, when the base plate unit is higher on one side and lower on the other side, there will be a gap in the middle and a lack of support points, which will affect the assembly strength of the composite beam during assembly. Utility Model Content

[0006] To address the problem of poor load-bearing capacity at the joints of existing assembled composite beams, this invention provides a composite beam with high strength and durability. Furthermore, to address the issue that existing composite beam assembly base frames mostly only provide support and cannot effectively and precisely adjust the inclination of the base plate units, this invention provides a composite beam assembly base frame capable of precisely adjusting the inclination of the base plate units.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A composite beam includes a bottom plate unit, a web unit, multiple support diaphragm units, a hollow diaphragm unit, and a cantilever. The bottom plate unit includes a bottom plate and a first diaphragm, which is arranged transversely along the bottom plate. The web units are arranged obliquely on both sides of the bottom plate unit. Each web unit includes a web, a second diaphragm, and a third diaphragm. The second and third diaphragms are both fixed to the inner side of the web. The lower end of the second diaphragm contacts the upper side of the bottom plate, and the lower end of the third diaphragm contacts the upper side of the first diaphragm. Multiple support diaphragm units are spaced apart on the bottom plate. On the plate, the fulcrum partition unit includes a fulcrum partition fixed to the base plate. Both sides of the fulcrum partition are fixedly connected to the web plate. Multiple hollow partition units are provided between adjacent fulcrum partition units. Each hollow partition unit includes a fourth partition and a V-shaped diagonal support. Both ends of the fourth partition are fixedly connected to the end faces of the third partition. One end of the diagonal support is fixed to the fourth partition, and the other end is connected and fixed to the first and third partitions. The cantilever arms are fixed to the outer side of the web plate, with multiple cantilever arms located on both sides of each fulcrum partition and the fourth partition. The web plate units on both sides of the base plate unit are fixedly connected to the multiple fulcrum partition units and hollow partition units fixed to the upper end of the base plate unit, resulting in stronger structural stability and better durability.

[0009] Furthermore, the base plate unit also includes a plurality of base plate ribs arranged longitudinally along the base plate, the base plate ribs passing through the first partition.

[0010] Furthermore, a pad is fixedly provided on the upper end surface of the first partition, the second partition, and the third partition.

[0011] Furthermore, the web unit also includes a first flange fixed to the upper end of the web, and the upper ends of the second and third partitions both contact the first flange.

[0012] Furthermore, both the upper ends of the fulcrum and the fourth fulcrum are fixed with a second flange. The first flange and the second flange cooperate to increase the contact area between the bridge and the composite beam at the upper end of the supporting composite beam, thereby improving the stability of the bridge.

[0013] Furthermore, the cantilever arm is flush with the upper surfaces of the first and second flanges, the upper end of the cantilever arm contacts the first flange, and the end of the second flange contacts the first flange.

[0014] The beneficial effects of this utility model through the above technical solution are as follows:

[0015] 1. The bottom plate of this utility model has web plates fixed on both sides. The lower end of the fulcrum partition is fixedly connected to the bottom plate, and the two sides of the fulcrum partition are fixedly connected to the web plates, thus fixing the fulcrum partition unit, the bottom plate unit, and the web plate unit into a whole. At the same time, the two ends of the fourth partition are fixedly connected to the third partition, realizing the connection and fixation between the hollow partition unit and the web plate unit. The diagonal support fixed at the lower part of the fourth partition is connected and fixed to the first partition and the third partition, thus realizing the fixation of the hollow partition unit, the bottom plate unit, and the web plate unit into a whole, ensuring the strength and service life of the composite beam.

[0016] 2. The first flange on the web of this utility model is combined with the second flange and the cantilever arm fixed at the upper end of the fulcrum partition and the fourth partition, thereby increasing the contact area between the bridge supporting the upper end of the composite beam and the upper surface of the composite beam, thus improving the stability of the bridge placed on the composite beam.

[0017] This utility model also provides an assembly base frame for supporting the aforementioned composite beam, including a base, multiple telescopic mechanisms and support frames. The telescopic mechanisms are located between the base and the bottom plate, the output ends of the multiple telescopic mechanisms are in contact with the lower side of the bottom plate, and the multiple support frames are respectively located on the outer side of the web and in contact with the side of the web.

[0018] Furthermore, the telescopic mechanism includes a column tube, a nut, and a screw. The column tube is hollow and open at the top. The nut is fixed to the upper end of the column tube, and the lower end of the screw extends into the column tube and is threadedly connected to the nut.

[0019] Furthermore, 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 face of the cantilever arm.

[0020] The beneficial effects of this utility model through the above technical solution are as follows: This utility model is provided with multiple telescopic mechanisms and support frames on the base. The multiple telescopic mechanisms are arranged in multiple rows along the longitudinal direction of the base, and each row of telescopic mechanisms is evenly arranged along the transverse direction of the base. The upper ends of each row of telescopic mechanisms are connected into a straight line with a certain degree of inclination after adjustment, so as to ensure the inclination accuracy of the base plate. When the base plate is placed on multiple telescopic mechanisms, it can ensure the stability of the base plate when the combined beam is assembled. At the same time, the support frame can limit the base plate on both sides and support the web plate unit when the combined beam is assembled, so as to ensure the structural strength of the web plate unit when it is fixed to the base plate unit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the composite beam assembled on the assembly base frame of the composite beam of this utility model;

[0022] Figure 2 For the present utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0023] Figure 3 This is a structural schematic diagram of a composite beam according to the present invention;

[0024] Figure 4 This is a structural schematic diagram of the base plate unit of this utility model;

[0025] Figure 5 This is a structural schematic diagram of the web unit of this utility model;

[0026] Figure 6 This is a structural schematic diagram of the hollow partition unit of this utility model;

[0027] Figure 7 This is a schematic diagram of the cantilever arm of this utility model;

[0028] Figure 8 This is a schematic diagram of the combined beam assembly base frame of this utility model;

[0029] Figure 9 This is a schematic diagram of the telescopic mechanism of this utility model. Figure 1 ;

[0030] Figure 10 This is a schematic diagram of the telescopic mechanism of this utility model. Figure 2 .

[0031] In the attached diagram, the following numbers are used: 1 for the base plate unit, 11 for the base plate, 12 for the first partition plate, 13 for the base plate rib, and 14 for the pad plate.

[0032] 2 is the web unit, 21 is the web, 22 is the second diaphragm, 23 is the third diaphragm, 24 is the first flange, and 25 is the stiffener;

[0033] 3 is a fulcrum partition unit, 31 is a fulcrum partition, 32 is a second flange, 33 is a first stiffening plate, 34 is a second stiffening plate, 35 is a manhole, and 36 is a fulcrum stiffening plate.

[0034] 4 is a hollow partition unit, 41 is the fourth partition, 42 is a diagonal brace, 43 is a node plate, and 44 is the third stiffening plate.

[0035] 5 is the cantilever arm, 71 is the base, 72 is the support frame, 73 is the support plate, 8 is the telescopic mechanism, 81 is the column tube, 82 is the nut, 83 is the screw, 84 is the retaining ring, and 85 is the through hole. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] Example 1

[0038] like Figures 1 to 7As shown, this embodiment provides a composite beam, including a bottom plate unit 1, a web plate unit 2, a support diaphragm unit 3, a hollow diaphragm unit 4, and cantilever arms 5 arranged opposite to each other;

[0039] refer to Figure 3 and Figure 4 The base plate unit 1 includes a base plate 11 and a plurality of first partitions 12 arranged laterally along the base plate 11. The plurality of first partitions 12 are evenly arranged on the base plate 11 and there is a gap between two adjacent first partitions 12.

[0040] The base plate unit 1 also includes a plurality of base plate ribs 13 arranged longitudinally along the base plate 1. The plurality of base plate ribs 13 are evenly distributed on the base plate 11 and there is a gap between two adjacent base plate ribs 13. The base plate ribs 13 pass through the first partition plate 12, and a pad 14 is fixed on the upper end surface of the first partition plate 12. The base plate ribs 13 are perpendicular to the first partition plate 12.

[0041] refer to Figure 3 and Figure 5 The web plate unit 2 is relatively inclined and disposed on both sides of the bottom plate unit 1. The web plate unit 2 includes a web plate 21, a second partition 22 and a third partition 23. In this embodiment, the web plate unit 2 includes one web plate 21, three second partitions 22 and two third partitions 23. A third partition 23 is disposed between two adjacent second partitions 22. There is a gap between adjacent second partitions 22 and third partitions 23. The third partition 23 corresponds to the first partition 12.

[0042] The second partition 22 and the third partition 23 are both fixed to the inner side of the web 21. The lower end of the second partition 22 contacts the upper side of the bottom plate 11, and the lower end of the third partition 23 contacts the upper side of the first partition 12. A pad 14 is fixedly provided on the upper surface of both the second partition 22 and the third partition 23.

[0043] Both sides of the base plate 11 are welded and fixed with web plates 21. The lower end of the second partition plate 22 on the web plate 21 is welded and fixed to the upper side of the base plate 11. The lower end of the third partition plate 23 on the web plate 21 is welded and fixed to the pad plate 14 on the upper end face of the first partition plate 12. The two ends of the first partition plate 12 are welded and fixed to the web plate 32.

[0044] The web unit 2 also includes a first flange 24 fixed to the upper end of the web 21, and the upper ends of the second partition 22 and the third partition 23 are in contact with the first flange 24.

[0045] refer to Figure 1 and Figure 2Multiple fulcrum partition units 3 are spaced apart on the base plate 11. Each fulcrum partition unit 3 includes a fulcrum partition 31 fixed on the base plate 11. Both sides of the fulcrum partition 31 are fixedly connected to the web plate 21. A second flange 32 is fixed to the upper end of the fulcrum partition 31.

[0046] Specifically, the fulcrum 31 is in the shape of an inverted isosceles trapezoid, with its lower end fixed to the base plate 11. The base plate rib 13 passes through the fulcrum 31. A horizontal first stiffening plate 33 is welded to the fulcrum 31, with both ends of the first stiffening plate 33 welded and fixed to the web plates 21 on both sides of the base plate 11. Two vertical second stiffening plates 34 are welded to the fulcrum 31, with the upper end of the second stiffening plate 34 welded and fixed to the second flange 32 and the lower end welded and fixed to the first stiffening plate 33. Multiple vertical fulcrum stiffening plates 36 are also welded to the fulcrum 31, with the upper end of the fulcrum stiffening plate 36 welded and fixed to the second flange 32 and the lower end passing through the first stiffening plate 33 and welded and fixed to the base plate 11. The fulcrum 31 unit is welded and fixed to the base plate unit 1 and the web plate unit 2 as a whole, improving the strength and service life of the composite beam.

[0047] Meanwhile, a manhole 35 is provided on the fulcrum partition 31 to facilitate maintenance by staff.

[0048] refer to Figure 1 , Figure 3 and Figure 6 Multiple hollow partition units 4 are provided between adjacent support partition units 3. Figure 1 Only one fulcrum partition unit 3 is shown in the image. The hollow partition unit 4 includes a fourth partition 41 and a V-shaped inclined support 42. The two ends of the fourth partition 41 are fixedly connected to the end face of the third partition 23. One end of the inclined support 42 is fixed on the fourth partition 41, and the other end is connected and fixed to the first partition 12 and the third partition 23. The upper end of the fourth partition 41 is fixed with a second flange 32.

[0049] Specifically, pads 14 are fixedly installed on the upper surfaces of the second partition 22 and the third partition 23. The two ends of the fourth partition 41 are welded and fixed to the pads 14 on one side of the third partition 23 on both sides of the web unit 2 on the bottom plate unit 1. The diagonal support 42 in the shape of an octagon is made of two opposite channel steels welded together. The upper ends of the two channel steels are welded and fixed to the middle of the fourth partition 41, and the lower ends are welded and fixed to the node plate 43 welded and fixed on the first partition 12 and the third partition 23. This makes the hollow partition unit 4 welded and fixed to the bottom plate unit 1 and the web unit 2 as a whole, improving the strength and service life of the composite beam.

[0050] It should also be understood that the two ends of the fourth partition 41 in the hollow partition unit 4 are fixed to the third partition 23 of the web unit 2. Since there are usually 2-3 hollow partition units 4 on a base plate unit 1, there are also usually 2-3 third partitions 23 on a web unit 2, while the number of second partitions 22 is usually greater than 3. The lower end of the diagonal support 42 in the hollow partition unit 4 is connected and fixed to the first partition 12 and the third partition 23, so the number of first partitions 12 on the base plate 11 corresponds to the number of hollow partition units 4.

[0051] In summary, by welding and fixing the fulcrum diaphragm unit 3 and the hollow diaphragm unit 4 to the bottom plate unit 1 and the web plate 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 hollow diaphragm unit 4 makes the internal space of the composite beam more spacious, which facilitates the maintenance and repair of the composite beam in the later stage.

[0052] refer to Figure 1 , Figure 3 and Figure 7 The cantilever arm 5 is fixed on the outside of the web plate 21, and multiple cantilever arms 5 are located on both sides of each fulcrum partition 31 and the fourth partition 41.

[0053] The cantilever arm 5 is flush with the upper surfaces of the first flange 24 and the second flange 32. The upper end of the cantilever arm 5 contacts the first flange 24, and the end of the second flange 32 contacts the first flange 24. The first flange 24, the second flange 32, and the cantilever arm 5 work together to increase the contact area between the bridge and the composite beam at the upper end of the supporting composite beam, thereby improving the stability of the bridge placed on the composite beam.

[0054] After being welded in the factory, the composite beams were transported directly to the bridge construction site, where they were then placed on the bridge piers and welded in place using a crane.

[0055] Example 2

[0056] like Figure 1 , Figures 8-10 As shown, this embodiment provides an assembly base frame for supporting a composite beam, including a base 71, multiple telescopic mechanisms 8 and support frames 72. The telescopic mechanisms 8 are located between the base 71 and the base plate 11. The output ends of the multiple telescopic mechanisms 8 are in contact with the lower side of the base plate 11. The multiple support frames 72 are located on the outside of the web plate 21 and are in contact with the side of the web plate 21.

[0057] Multiple support frames 72 are arranged in pairs, with multiple sets of support frames 72 arranged longitudinally along the base 71. The two support frames 72 in each set are symmetrically arranged on both sides of the base 71, and a row of telescopic mechanisms 8 is provided between the two support frames 72 in each set.

[0058] refer to Figure 1Multiple rows of telescopic mechanisms 8 are arranged along the longitudinal direction of the base 71. Each row of telescopic mechanisms 8 consists of 4 mechanisms, which are evenly arranged along the transverse direction of the base 71, and the upper ends of the telescopic mechanisms 8 all contact the lower side of the bottom plate 11 of the composite beam.

[0059] In order to ensure that the base plate 11 maintains a certain tilt from the beginning, the telescopic mechanism 8 needs to be adjusted. The upper ends of the four telescopic mechanisms 8 in each row are connected to form a straight line with a certain tilt after adjustment. The adjustment of multiple rows of telescopic mechanisms 8 is consistent to ensure the stability of the base plate 11 when the composite beam is assembled.

[0060] refer to Figure 8 and Figure 9 The telescopic mechanism 8 includes a column tube 81, a nut 82, and a screw 83. The column tube 81 is hollow and open at the top. The nut 82 is fixed to the upper end of the column tube 81. The lower end of the screw 83 extends into the column tube 81 and is threadedly connected to the nut 82. A retaining ring 84 is also threaded onto the screw 83 to fix its position. A tube plate is fixed to the lower part of the column tube 81 and welded to the base 71. By rotating the screw 83, the screw 83 can be adjusted up and down within the column tube 81. A through hole 85 is provided at the upper end of the screw 83 for easy adjustment by staff.

[0061] 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 face of the cantilever arm 5. This provides support and stability for the welding and fixing of the cantilever arm 5.

[0062] The assembly method for assembling composite beams using this assembly base frame includes the following steps:

[0063] Step 1: Adjust the extension of each telescopic mechanism 8 on the base 71 so that the base plate 11 is placed at an angle on the upper end of the multiple telescopic mechanisms 8 on the base 71, and the upper side of the base plate 11 is in contact with the upper end of each telescopic mechanism 8.

[0064] The base plate 11 is placed at the ends of multiple telescopic mechanisms 8 by means of hoisting. Before placing the base plate 11, the height of the telescopic mechanisms 8 needs to be adjusted. After adjustment, the upper ends of the four telescopic mechanisms 8 in each row are connected to form a straight line with a certain degree of inclination. The multiple rows of telescopic mechanisms 8 can be adjusted to be consistent. At this time, the bottom end of the web plate unit 2 on one side of the base plate 11 is higher than the bottom end of the web plate unit 2 on the other side of the base plate 11.

[0065] Step 2: Place a web plate unit 2 on one side of the base plate 11. The outer side of the web plate 21 in the web plate unit 2 contacts the side of the support frame 72. The web plate unit 2 is connected and fixed to the base plate 11.

[0066] A web plate unit 2 is welded and fixed to the base plate 11. The lower end of the second partition plate 22 on the web plate 21 is welded and fixed to the upper side of the base plate 11. The lower end of the third partition plate 23 on the web plate 21 is welded and fixed to the pad plate 14 on the upper end face of the first partition plate 12. One end of the first partition plate 12 is welded and fixed to one side of the web plate 32.

[0067] Step 3: Connect and fix the multiple support partition units 3 and the hollow partition unit 4 to the bottom plate 11 and the web plate unit 2.

[0068] The lower end face of the fulcrum partition 31 is fixed to the base plate 11. The base plate rib 13 passes through the through groove opened at the lower part of the fulcrum partition 31. The end of the first stiffening plate 33 welded on the fulcrum partition 31 is welded and fixed to the web plate 21 on one side of the base plate 11. The upper ends of the multiple vertical fulcrum stiffening plates 36 welded on the fulcrum partition 31 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 base plate 11. The fulcrum partition unit 3 is welded and fixed to the base plate unit 1 and the web plate unit 2 on one side as a whole.

[0069] One end of the fourth partition 41 is welded and fixed to the pad 14 on one side of the third partition 23 on the web unit 2 on one side of the bottom plate unit 1. The upper end of the V-shaped diagonal support 42 is welded and fixed to the middle of the fourth partition 41, and the lower end is welded and fixed to the node plate 43 welded and fixed on the first partition 12 and the third partition 23, so that the hollow partition unit 4, the bottom plate unit 1 and the web unit 2 on one side are welded and fixed as a whole.

[0070] Step 4: Place another web plate unit 2 on the other side of the base plate 11. The outer side of the web plate 21 in the web plate unit 2 contacts the side of the support frame 71. The web plate unit 2 is connected and fixed to the base plate 11, multiple support partitions 31 and the fourth partition 41. Then weld the web plate unit 2 on the other side to the hollow partition unit 4 and the base plate unit 1 into a whole. For specific steps, please refer to Step 2 and Step 3.

[0071] Step 5: Fix the cantilever arm 5 to the outside of the web plate 21. First, hoist the cantilever arm 5 to the upper side of the support plate 73, and then weld the cantilever arm 5 to the outside of the web plate 21.

[0072] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A composite beam, characterized in that, It includes a base plate unit (1), a web plate unit (2), multiple support plate units (3), a hollow plate unit (4), and a cantilever arm (5); The base plate unit (1) includes a base plate (11) and a first partition plate (12), the first partition plate (12) being arranged laterally along the base plate (11); The web plate unit (2) is relatively inclined and arranged on both sides of the bottom plate unit (1). The web plate unit (2) includes a web plate (21), a second partition plate (22) and a third partition plate (23). The second partition plate (22) and the third partition plate (23) are both fixed inside the web plate (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). Multiple fulcrum partition units (3) are spaced apart on the base plate (11). Each fulcrum partition unit (3) includes a fulcrum partition (31) fixed on the base plate (11). The two sides of the fulcrum partition (31) are fixedly connected to the web plate (21). Multiple hollow partition units (4) are provided between adjacent support partition units (3). The hollow partition unit (4) includes a fourth partition (41) and a figure-eight shaped inclined support (42). The two ends of the fourth partition (41) are fixedly connected to the end face of the third partition (23). One end of the inclined support (42) is fixed on the fourth partition (41), and the other end is connected and fixed to the first partition (12) and the third partition (23). The cantilever arm (5) is fixed on the outside of the web plate (21), and multiple cantilever arms (5) are located on both sides of each of the fulcrum partitions (31) and the fourth partition (41).

2. A composite beam according to claim 1, characterized in that, The base plate unit (1) also includes a plurality of base plate ribs (13) arranged longitudinally along the base plate (11), the base plate ribs (13) passing through the first partition (12).

3. A composite beam according to claim 1, characterized in that, The upper surfaces of the first partition (12), the second partition (22) and the third partition (23) are all fixedly provided with pads (14).

4. A composite beam according to claim 1, characterized in that, The web unit (2) also includes a first flange (24) fixed to the upper end of the web (21), and the upper ends of the second partition (22) and the third partition (23) are in contact with the first flange (24).

5. A composite beam according to claim 4, characterized in that, The upper ends of both the fulcrum partition (31) and the fourth partition (41) are fixed with a second flange (32).

6. A composite beam according to claim 5, characterized in that, The upper surfaces of the lifting arm (5) are flush with the upper surfaces of the first flange (24) and the second flange (32). The upper end of the lifting arm (5) is in contact with the first flange (24), and the end of the second flange (32) is in contact with the first flange (24).

7. The assembled base frame, characterized in that, For supporting a composite beam according to any one of claims 1-6, it includes a base (71), a plurality of telescopic mechanisms (8) and a support frame (72), wherein the telescopic mechanisms (8) are located between the base (71) and the bottom plate (11), the output ends of the plurality of telescopic mechanisms (8) are in contact with the lower side of the bottom plate (11), and the plurality of support frames (72) are respectively located on the outside of the web plate (21) and in contact with the side of the web plate (21).

8. The assembly base frame according to claim 7, characterized in that, The telescopic mechanism (8) includes a column tube (81), a nut (82) and a screw (83). The column tube (81) is hollow and open at the top. The nut (82) is fixed at the top of the column tube (81). The lower end of the screw (83) extends into the column tube (81) and is threadedly connected to the nut (82).

9. The assembly base frame according to claim 7, characterized in that, 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 face of the cantilever arm (5).

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