Bailey beam with adjustable length

Abstract

The utility model relates to a length-adjustable bailey beam, and belongs to the technical field of bridge construction, the length-adjustable bailey beam comprises a bailey beam structure, the bailey beam structure is composed of a plurality of bailey pieces and triangular truss structures, the ends of all the bailey pieces are connected with the triangular truss structures, and the triangular truss structures are connected with the ends of all the bailey pieces. The triangular truss mechanism comprises a telescopic upper chord component, a telescopic inclined rod component, a vertical rod and a bottom rod; after the bailey beam is formed by assembling the multiple bailey beam pieces, the triangular truss mechanisms are arranged at the ends of the bailey beam pieces, when the span of the trestle is not the integral multiple of 1.5 m, the bailey pieces of the integer number cannot be used for completing trestle building, the distance smaller than 1.5 m can be left, and at the moment, by adjusting the length of the upper chord assembly and the length of the inclined rod assembly, the distance smaller than 1.5 m can be adjusted. The length of the bailey beam is adjusted through the triangular truss mechanism so as to be matched with the span of a trestle, and the construction efficiency and the construction quality are improved.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction, and particularly relates to a Bailey beam with adjustable length. Background Art

[0002] A trestle is a building shaped like a bridge, used in stations, ports, mines or factories for loading and unloading goods, boarding and alighting passengers, or as a temporary bridge structure specifically for construction site traffic, machinery layout and overhead operations. In civil engineering, it is a temporary bridge facility built at the construction site to solve the transportation of materials and equipment in water and the passage of personnel. The trestle in railway ferry is a bridge structure for locomotives and vehicles to drive onto and off the ferry.

[0003] The Bailey beam in the existing steel trestle is a truss beam assembled by Bailey plates. Most of the Bailey plates are connected by hairpin windows and fixed with bolts. Because of its rapid erection and strong mobility, it is mostly used for erecting simple bridges in river courses and cliffs, and is now mostly used in engineering construction, such as gantry cranes, construction platforms, engineering access bridges, etc. The Bailey plate is a steel frame that has formed a certain unit, and it can be spliced and assembled into many components and equipment. The material of the Bailey plate is 16Mn (manganese), and its length and width are generally 3m×1.5m. Each piece weighs 270kg, and it has the characteristics of simple structure, convenient transportation, rapid erection, large load capacity, good interchangeability and strong adaptability.

[0004] However, when the span of the existing trestle is not an integer multiple of 1.5m, there will be a section less than 1.5m at both ends of the Bailey beam, resulting in the problem that the span requirement cannot be met. Summary of the Invention

[0005] The embodiments of this application provide a Bailey beam with adjustable length to solve the problem in the related art that when the span of the existing trestle is not an integer multiple of 1.5m, there will be a section less than 1.5m at both ends of the Bailey beam, resulting in the problem that the span requirement cannot be met.

[0006] The embodiments of this application provide a Bailey beam with adjustable length, including:

[0007] A Bailey beam structure, which is composed of several Bailey plates;

[0008] A triangular truss mechanism, and the end of each Bailey plate is connected with the triangular truss mechanism. The triangular truss mechanism includes a telescopic upper chord rod assembly, a telescopic inclined rod assembly, a vertical rod and a bottom rod.

[0009] In some embodiments, the upper chord rod assembly includes a first fixing plate, a first upper chord rod and a second upper chord rod slidably arranged outside the first fixing plate;

[0010] The inclined rod assembly includes a second fixing plate, a first inclined rod and a second inclined rod slidably arranged outside the second fixing plate;

[0011] One end of the second upper chord rod away from the first fixing plate is connected to the Bailey truss, and one end of the first upper chord rod away from the first fixing plate is hinged to one end of the first diagonal rod;

[0012] One end of the first diagonal rod away from the second fixing plate is hinged to the first upper chord rod;

[0013] One end of the second diagonal rod away from the second fixing plate is hinged to the bottom rod;

[0014] The vertical rod is vertically arranged between the bottom rod and the second upper chord rod.

[0015] In some embodiments, a plurality of upper chord bolt holes are provided on both the first upper chord rod and the second upper chord rod;

[0016] The first fixing plate is provided with first fixing plate bolt holes;

[0017] The upper chord bolt holes can be aligned with the first fixing plate bolt holes and connected by bolts.

[0018] In some embodiments, a plurality of diagonal rod bolt holes are provided on both the first diagonal rod and the second diagonal rod;

[0019] The second fixing plate is provided with second fixing plate bolt holes;

[0020] The diagonal rod bolt holes can be aligned with the second fixing plate bolt holes and connected by bolts.

[0021] In some embodiments, the upper chord rod assembly includes a first upper chord rod, a second upper chord rod, and a first connecting cylinder disposed between the first upper chord rod and the second upper chord rod and sleeving the first upper chord rod and the second upper chord rod;

[0022] The diagonal rod assembly includes a first diagonal rod, a second diagonal rod, and a second connecting cylinder disposed between the first diagonal rod and the second diagonal rod and sleeving the first diagonal rod and the second diagonal rod;

[0023] One end of the second upper chord rod away from the first connecting cylinder is connected to the Bailey truss, and one end of the first upper chord rod away from the first connecting cylinder is hinged to one end of the first diagonal rod;

[0024] One end of the first diagonal rod away from the second connecting cylinder is hinged to the first upper chord rod;

[0025] One end of the second diagonal rod away from the second connecting cylinder is hinged to the bottom rod;

[0026] The vertical rod is vertically arranged between the bottom rod and the second upper chord rod.

[0027] In some embodiments, a plurality of upper chord bolt holes are provided on both the first upper chord rod and the second upper chord rod;

[0028] The first connecting cylinder is provided with first connecting cylinder bolt holes;

[0029] The upper chord bolt holes can be aligned with the first connecting cylinder bolt holes and connected by bolts.

[0030] In some embodiments, a plurality of diagonal member bolt holes are provided in both the first diagonal member and the second diagonal member;

[0031] The second connecting cylinder is provided with second connecting cylinder bolt holes;

[0032] The diagonal member bolt holes can be aligned with the second connecting cylinder bolt holes and connected by bolts.

[0033] In some embodiments, internal threads are provided on the inner wall of the first connecting cylinder, and external threads are provided on the outer walls of the first upper chord and the second upper chord;

[0034] Both the first upper chord and the second upper chord are threadedly connected to the first connecting cylinder.

[0035] In some embodiments, internal threads are provided on the inner wall of the second connecting cylinder, and external threads are provided on the outer walls of the first diagonal member and the second diagonal member;

[0036] Both the first diagonal member and the second diagonal member are threadedly connected to the first connecting cylinder.

[0037] In some embodiments, connectors for connecting the triangular truss mechanisms are provided on the vertical members.

[0038] The beneficial effects brought by the technical solution provided in this application include:

[0039] When the Bailey beam is assembled by a plurality of Bailey beam sheets, triangular truss mechanisms are provided at the ends of the Bailey beam sheets. When the span of the trestle is not an integer multiple of 1.5 m, it is impossible to use an integer number of Bailey sheets to complete the erection of the trestle, and a part of the distance less than 1.5 m will be left. At this time, by adjusting the lengths of the upper chord member assembly and the diagonal member assembly, the length of the Bailey beam is adjusted through the triangular truss mechanism to match the span of the trestle, improving the construction efficiency and construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is the first structural schematic diagram provided by the embodiment of the present application;

[0042] Figure 2 This is the second structural schematic diagram provided by the embodiment of the present application;

[0043] Figure 3 This is the third structural schematic diagram provided by the embodiment of the present application;

[0044] Figure 4 This is the construction schematic diagram provided by the embodiment of the present application.

[0045] 2. First fixing plate; 21. First fixing plate bolt hole; 5. Second fixing plate; 51. Second fixing plate bolt hole; 6. Vertical rod; 61. First connecting cylinder bolt hole; 7. Second connecting cylinder; 71. Second connecting cylinder bolt hole; 8. Bottom rod; 9. Bailey truss; 10. Connector; 11. First upper chord; 12. Second upper chord; 13. Upper chord bolt hole; 14. First connecting cylinder; 41. First diagonal rod; 42. Second diagonal rod; 43. Diagonal rod bolt hole. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] The embodiment of the present application provides an adjustable-length Bailey beam, which can solve the problem that when the span of the existing trestle is not an integer multiple of 1.5 m, there will be a section of less than 1.5 m distance at both ends of the Bailey beam, resulting in the inability to meet the span requirements.

[0048] See Figures 1-4 As shown, the embodiment of the present application provides an adjustable-length Bailey beam, including:

[0049] Bailey beam structure, which is composed of several Bailey trusses 9;

[0050] Triangular truss mechanism, and triangular truss structures are connected to the ends of each Bailey truss 9. The triangular truss mechanism includes a telescopic upper chord assembly, a telescopic diagonal rod assembly, a vertical rod 6 and a bottom rod 8.

[0051] The length is adjusted through the triangular truss mechanism to match the span of the trestle, improving the construction efficiency and quality, and avoiding the situation that when the span of the trestle is not an integer multiple of 1.5 m, an integer number of Bailey trusses 9 cannot be used to complete the erection of the trestle, leaving a part of less than 1.5 m distance.

[0052] In some alternative embodiments, seeFigure 1 and Figure 4 As shown in Figure 4 , in the adjustable-length Bailey beam, the upper chord assembly includes a first fixed plate 2, a first upper chord 11 and a second upper chord 12 slidably arranged outside the first fixed plate 2. The diagonal member assembly includes a second fixed plate 5, a first diagonal member 41 and a second diagonal member 42 slidably arranged outside the second fixed plate 5. One end of the second upper chord 12 far from the first fixed plate 2 is connected to the Bailey sheet 9. One end of the first upper chord 11 far from the first fixed plate 2 is hinged to one end of the first diagonal member 41. One end of the first diagonal member 41 far from the second fixed plate 5 is hinged to the first upper chord 11. One end of the second diagonal member 42 far from the second fixed plate 5 is hinged to the bottom bar 8. The vertical bar 6 is vertically arranged between the bottom bar 8 and the second upper chord 12.

[0053] In this embodiment, a plurality of upper chord bolt holes 13 are provided in both the first upper chord 11 and the second upper chord 12, and a first fixed plate bolt hole 21 is provided in the first fixed plate 2. The upper chord bolt holes 13 can be aligned with the first fixed plate bolt hole 21 and bolted.

[0054] In this embodiment, a plurality of diagonal member bolt holes 43 are provided in both the first diagonal member 41 and the second diagonal member 42, and a second fixed plate bolt hole 51 is provided in the second fixed plate 5. The diagonal member bolt holes 43 can be aligned with the second fixed plate bolt hole 51 and bolted.

[0055] When it is necessary to expand and contract the triangular truss mechanism to adapt the length of the Bailey beam, pull the first upper chord 11 and the second upper chord 12 away from the first fixed plate 2 to an appropriate length, and align the upper chord bolt holes 13 on the first upper chord 11 and the second upper chord 12 with the first fixed plate bolt hole 21 on the first fixed plate 2. Then, tighten and fix them by bolts passing through the upper chord bolt holes 13 and the first fixed plate bolt hole 21.

[0056] At the same time, also pull the first diagonal member 41 and the second diagonal member 42 away from the second fixed plate 5 to an appropriate length, and align the diagonal member bolt holes 43 on the first diagonal member 41 and the second diagonal member 42 with the second fixed plate bolt hole 51 on the second fixed plate 5. Then, tighten and fix them by bolts passing through the diagonal member bolt holes 43 and the second fixed plate bolt hole 51.

[0057] The first upper chord 11 and the second upper chord 12 can be pulled out simultaneously or separately, as long as the length of the Bailey beam can be adapted. There are two first fixed plate bolt holes 21 on the first fixed plate 2, corresponding to the first upper chord 11 and the second upper chord 12 respectively.

[0058] The first diagonal rod 41 and the second diagonal rod 42 can be pulled out externally simultaneously or separately, as long as the length of the Bailey beam can be adapted. There are two second fixing plate bolt holes 51 on the second fixing plate 5, corresponding to the first diagonal rod 41 and the second diagonal rod 42 respectively.

[0059] The hinged connection structures of the first diagonal rod 41, the second diagonal rod 42, the first upper chord rod 11 and the second upper chord rod 12 are the same. Taking the first upper chord rod 11 as an example, a hinged hole is provided on the first upper chord rod 11, and a hinged hole is provided on the first diagonal rod 41. A hinge shaft inserted into the hinged holes is arranged between the first upper chord rod 11 and the first diagonal rod 41 for hinged connection. And the side wall of the first diagonal rod 41 is in contact with the side wall of the first upper chord rod 11 in a superimposed state between the first diagonal rod 41 and the first upper chord rod 11.

[0060] In this embodiment, the upper chord rod assembly, the diagonal rod assembly, the vertical rod 6 and the bottom rod 8 are all preferably channel steels, and the first fixing plate 2 and the second fixing plate 5 are preferably steel plates, so that the first fixing plate 2 and the second fixing plate 5 can be placed in the grooves of the channel steels to realize the telescopic function of the upper chord rod assembly and the diagonal rod assembly.

[0061] In some alternative embodiments, referring to Figure 2 and Figure 4 As shown, in the adjustable-length Bailey beam, the upper chord rod assembly includes a first upper chord rod 11, a second upper chord rod 12, and a first connecting cylinder 14 disposed between the first upper chord rod 11 and the second upper chord rod 12 and sleeved outside the first upper chord rod 11 and the second upper chord rod 12. The diagonal rod assembly includes a first diagonal rod 41, a second diagonal rod 42, and a second connecting cylinder 7 disposed between the first diagonal rod 41 and the second diagonal rod 42 and sleeved outside the first diagonal rod 41 and the second diagonal rod 42. One end of the second upper chord rod 12 far from the first connecting cylinder 14 is connected to the Bailey sheet 9. One end of the first upper chord rod 11 far from the first connecting cylinder 14 is hinged to one end of the first diagonal rod 41. One end of the first diagonal rod 41 far from the second connecting cylinder 7 is hinged to the first upper chord rod 11. One end of the second diagonal rod 42 far from the second connecting cylinder 7 is hinged to the bottom rod 8. The vertical rod 6 is vertically disposed between the bottom rod 8 and the second upper chord rod 12.

[0062] In this embodiment, a plurality of upper chord rod bolt holes 13 are provided on both the first upper chord rod 11 and the second upper chord rod 12, and a first connecting cylinder bolt hole 61 is provided on the first connecting cylinder 14. The upper chord rod bolt holes 13 can be aligned with the first connecting cylinder bolt hole 61 and bolted.

[0063] In this embodiment, a plurality of diagonal rod bolt holes 43 are provided on both the first diagonal rod 41 and the second diagonal rod 42, and a second connecting cylinder bolt hole 71 is provided on the second connecting cylinder 7. The diagonal rod bolt holes 43 can be aligned with the second connecting cylinder bolt hole 71 and bolted.

[0064] Among them, the first upper chord 11, the second upper chord 12, the first diagonal member 41 and the second diagonal member 42 are hollow cylindrical, the first connecting cylinder 14 and the second connecting cylinder 7 are cylindrical. The first upper chord 11 and the second upper chord 12 are respectively inserted into the first connecting cylinder 14 from the two ends of the first connecting cylinder 14, and the first diagonal member 41 and the second diagonal member 42 are respectively inserted into the second connecting cylinder 7 from the two ends of the second connecting cylinder 7.

[0065] When it is necessary to expand and contract the triangular truss mechanism to adapt the length of the Bailey beam, the first upper chord 11 and the second upper chord 12 are pulled outwards away from the first connecting cylinder 14 to an appropriate length, and the upper chord bolt holes 13 on the first upper chord 11 and the second upper chord 12 are aligned with the first connecting cylinder bolt holes 61 on the first connecting cylinder 14, and then bolts are passed through the upper chord bolt holes 13 and the first connecting cylinder bolt holes 61 and tightened and fixed.

[0066] At the same time, the first diagonal member 41 and the second diagonal member 42 are also pulled outwards away from the second connecting cylinder 7 to an appropriate length, and the diagonal member bolt holes 43 on the first diagonal member 41 and the second diagonal member 42 are aligned with the second connecting cylinder bolt holes 71 on the second connecting cylinder 7, and then bolts are passed through the diagonal member bolt holes 43 and the second connecting cylinder bolt holes 71 and tightened and fixed.

[0067] The first upper chord 11 and the second upper chord 12 can be pulled out simultaneously or separately, as long as the length of the Bailey beam can be adapted. There are two first connecting cylinder bolt holes 61 on the first connecting cylinder 14, corresponding to the first upper chord 11 and the second upper chord 12 respectively.

[0068] The first diagonal member 41 and the second diagonal member 42 can be pulled out simultaneously or separately, as long as the length of the Bailey beam can be adapted. There are two second connecting cylinder bolt holes 71 on the second connecting cylinder 7, corresponding to the first diagonal member 41 and the second diagonal member 42 respectively.

[0069] Among them, the bottom rod 8 and the vertical rod 6 can preferably be channel steels or can also be cylindrical. Taking the articulated connection between the upper chord assembly and the diagonal member assembly as an example of the first upper chord 11 and the first diagonal member 41, the principle of the remaining articulated connection structures is the same. The first upper chord 11 and the second diagonal member 42 are in a state of side wall contact and superposition, and articulated holes are respectively opened on the first upper chord 11 and the second diagonal member 42 and are connected by an articulated shaft.

[0070] In some alternative embodiments, refer to Figure 3 and Figure 4As shown, in the adjustable-length Bailey beam, the upper chord assembly includes a first upper chord 11, a second upper chord 12, and a first connecting cylinder 14 disposed between the first upper chord 11 and the second upper chord 12 and sleeving the first upper chord 11 and the second upper chord 12. The diagonal member assembly includes a first diagonal member 41, a second diagonal member 42, and a second connecting cylinder 7 disposed between the first diagonal member 41 and the second diagonal member 42 and sleeving the first diagonal member 41 and the second diagonal member 42. One end of the second upper chord 12 away from the first connecting cylinder 14 is connected to the Bailey sheet 9. One end of the first upper chord 11 away from the first connecting cylinder 14 is hinged to one end of the first diagonal member 41. One end of the first diagonal member 41 away from the second connecting cylinder 7 is hinged to the first upper chord 11. One end of the second diagonal member 42 away from the second connecting cylinder 7 is hinged to the bottom rod 8. The vertical rod 6 is vertically disposed between the bottom rod 8 and the second upper chord 12.

[0071] In this embodiment, internal threads are provided on the inner wall of the first connecting cylinder 14, and external threads are provided on the outer walls of the first upper chord 11 and the second upper chord 12. Both the first upper chord 11 and the second upper chord 12 are threadedly connected to the first connecting cylinder 14.

[0072] In this embodiment, internal threads are provided on the inner wall of the second connecting cylinder 7, and external threads are provided on the outer walls of the first diagonal member 41 and the second diagonal member 42. Both the first diagonal member 41 and the second diagonal member 42 are threadedly connected to the first connecting cylinder 14.

[0073] When it is necessary to expand and contract the triangular truss mechanism to adapt the length of the Bailey beam, rotating the first connecting cylinder 14 can cause the first upper chord 11 and the second upper chord 12 threadedly connected to the first connecting cylinder 14 to expand and contract. For example, when the first connecting cylinder 14 rotates forward, the first upper chord 11 and the second upper chord 12 extend simultaneously, increasing the length of the upper chord assembly. When the first connecting cylinder 14 rotates in reverse, the first upper chord 11 and the second upper chord 12 contract simultaneously, reducing the length of the upper chord assembly.

[0074] At the same time, the second connecting cylinder 7 is also rotated to drive the first diagonal member 41 and the second diagonal member 42 to expand and contract, which is the same as the expansion and contraction principle of the upper chord assembly.

[0075] Among them, the bottom rod 8 and the vertical rod 6 can preferably be channel steels or can also be tubular. Taking the hinged connection between the upper chord assembly and the diagonal member assembly as an example of the first upper chord 11 and the first diagonal member 41, the principle of the remaining hinged connection structures is the same. The first upper chord 11 and the second diagonal member 42 are in a state of side wall contact and superposition. Hinged holes are respectively provided on the first upper chord 11 and the second diagonal member 42 and are connected by a hinge shaft.

[0076] In some alternative embodiments, as shown in Figure 1 In the adjustable-length Bailey beam, a connecting member 10 for connecting the triangular truss mechanisms on several Bailey sheets 9 is provided on the vertical rod 6.

[0077] Since the Bailey beam is composed of several Bailey sheets 9, and a triangular truss mechanism is connected to each Bailey sheet 9. The connecting piece 10 is a channel steel, and the openings of the connecting pieces 10 on each triangular truss mechanism are arranged oppositely. After the Bailey sheets 9 are erected, a steel plate or other rod-shaped connecting structure is passed through the connecting pieces 10 of each triangular truss mechanism, and then the triangular truss mechanisms are integrated by bolts or welding, improving the stability and bearing capacity of the triangular truss mechanism.

[0078] The working principle and process of this application are as follows:

[0079] When the Bailey beam is assembled by several Bailey sheets 9, triangular truss mechanisms are arranged at the ends of the Bailey sheets 9. When the span of the trestle is not an integer multiple of 1.5 m, it is impossible to complete the erection of the trestle using an integer number of Bailey sheets 9, and there will be a remaining distance less than 1.5 m. At this time, by adjusting the lengths of the upper chord rod assembly and the diagonal rod assembly, the length of the Bailey beam is adjusted through the triangular truss mechanism to match the span of the trestle, improving the construction efficiency and quality.

[0080] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0081] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0082] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A Bailey beam with adjustable length, characterized in that: include: A Bailey beam structure, wherein the Bailey beam structure is composed of a plurality of Bailey plates (9); A triangular truss mechanism, wherein the ends of each Bailey plate (9) are connected to the triangular truss mechanism, and the triangular truss mechanism comprises a telescopic upper chord assembly, a telescopic diagonal rod assembly, a vertical rod (6) and a bottom rod (8).

2. The Bailey beam with adjustable length as claimed in claim 1, characterized in that: The upper chord rod assembly comprises a first fixing plate (2), a first upper chord rod (11) and a second upper chord rod (12) slidably arranged outside the first fixing plate (2); The inclined rod assembly comprises a second fixed plate (5), a first inclined rod (41) and a second inclined rod (42) slidably arranged outside the second fixed plate (5); One end of the second upper chord rod (12) away from the first fixing plate (2) is connected to the Bailey plate (9), and one end of the first upper chord rod (11) away from the first fixing plate (2) is hinged to one end of the first oblique rod (41); One end of the first oblique rod (41) away from the second fixing plate (5) is hinged to the first upper chord rod (11); One end of the second oblique rod (42) away from the second fixed plate (5) is hinged to the bottom rod (8); The vertical rod (6) is vertically arranged between the bottom rod (8) and the second upper chord rod (12).

3. The Bailey beam with adjustable length as claimed in claim 2, characterized in that: The first upper chord rod (11) and the second upper chord rod (12) are both provided with a plurality of upper chord rod bolt holes (13); The first fixing plate (2) is provided with a first fixing plate bolt hole (21); The upper chord bolt hole (13) can be aligned with the first fixing plate bolt hole (21) and bolted together.

4. The Bailey beam with adjustable length as claimed in claim 2, characterized in that: The first diagonal rod (41) and the second diagonal rod (42) are both provided with a plurality of diagonal rod bolt holes (43); The second fixing plate (5) is provided with a second fixing plate bolt hole (51); The oblique rod bolt hole (43) can be aligned with the second fixing plate bolt hole (51) and bolted together.

5. The Bailey beam with adjustable length according to claim 1, characterized in that: The upper chord rod assembly comprises a first upper chord rod (11), a second upper chord rod (12), and a first connecting tube (14) arranged between the first upper chord rod (11) and the second upper chord rod (12) and sleeved on the outside of the first upper chord rod (11) and the second upper chord rod (12); The inclined rod assembly comprises a first inclined rod (41), a second inclined rod (42), and a second connecting tube (7) arranged between the first inclined rod (41) and the second inclined rod (42) and sleeved on the outside of the first inclined rod (41) and the second inclined rod (42); One end of the second upper chord rod (12) away from the first connecting tube (14) is connected to the Bailey plate (9), and one end of the first upper chord rod (11) away from the first connecting tube (14) is hinged to one end of the first oblique rod (41); One end of the first oblique rod (41) away from the second connecting tube (7) is hinged to the first upper chord rod (11); One end of the second oblique rod (42) away from the second connecting tube (7) is hinged to the bottom rod (8); The vertical rod (6) is vertically arranged between the bottom rod (8) and the second upper chord rod (12).

6. The Bailey beam with adjustable length as claimed in claim 5, characterized in that: The first upper chord rod (11) and the second upper chord rod (12) are both provided with a plurality of upper chord rod bolt holes (13); The first connecting tube (14) is provided with a first connecting tube bolt hole (61); The upper chord bolt hole (13) can be aligned with the first connecting tube bolt hole (61) and bolted together.

7. The Bailey beam with adjustable length as claimed in claim 5, characterized in that: The first diagonal rod (41) and the second diagonal rod (42) are both provided with a plurality of diagonal rod bolt holes (43); The second connecting tube (7) is provided with a second connecting tube bolt hole (71); The oblique rod bolt hole (43) can be aligned with the second connecting tube bolt hole (71) and bolted together.

8. The Bailey beam with adjustable length as claimed in claim 5, characterized in that: An internal thread is provided on the inner wall of the first connecting tube (14), and an external thread is provided on the outer walls of the first upper chord rod (11) and the second upper chord rod (12); The first upper chord rod (11) and the second upper chord rod (12) are both threadedly connected to the first connecting tube (14).

9. The Bailey beam with adjustable length as claimed in claim 8, characterized in that: An internal thread is provided on the inner wall of the second connecting tube (7), and an external thread is provided on the outer walls of the first inclined rod (41) and the second inclined rod (42); The first oblique rod (41) and the second oblique rod (42) are both threadedly connected to the first connecting tube (14).

10. The Bailey beam with adjustable length according to claim 1, characterized in that: The vertical rod (6) is provided with a connecting piece (10) for connecting the triangular truss mechanisms.

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