A large-span straddle-type monorail track beam and construction method thereof

Abstract

The present invention relates to the field of rail transportation, and in particular to a large-span straddle-type monorail track beam and a construction method thereof, comprising two relatively arranged track beams, each of the track beams comprising a steel truss, a stabilizing wheel running beam and a traveling wheel running beam, the steel truss comprising a lower chord and a web, two webs being a group connected to the lower chord and forming a triangular structure, the traveling wheel running beam being arranged on the top of the web, the stabilizing wheel running beam being arranged on the web and being located below the traveling wheel running beam, the stabilizing wheel running beam being parallel to the traveling wheel running beam, the stabilizing wheel running beam and the traveling wheel running beam being separated by the steel truss, thereby greatly reducing the weight of the straddle-type monorail track beam itself, and adopting a method of combining the steel truss with the stabilizing wheel running beam and the traveling wheel running beam, thereby effectively reducing the demand for steel materials when the span is large.

Description

Technical Field

[0001] The invention relates to the field of rail transportation, and in particular to a large-span straddle-type monorail track beam and a construction method thereof. Background Art

[0002] Straddle-type monorail transportation is a medium-capacity rail transportation system with electric traction, special guide and switch devices, and train formations running on special track beams. Its main features are: (1) It is mainly an elevated structure, which occupies a small area, and the track beam is narrow and occupies a small space. (2) The rubber tire has good adhesion performance, which is conducive to acceleration and deceleration, and is conducive to running on large slopes and small radius curves. It can adapt to sharp turns and large slopes and has good applicability to complex terrain. (3) It is easy to select the route and requires less demolition. (4) The vehicle is equipped with running wheels and guide wheels, and uses rubber tires and air spring bogies, which disperse the force and reduce the running noise. (5) The civil engineering is simple, the construction period is short, and the investment is small. As an organic part of the urban comprehensive transportation system, straddle-type monorail transportation has received more and more attention and has a good development prospect.

[0003] The straddle-type monorail is a new type of rail transit, which is supported, stabilized and guided by a single track, and the vehicle body uses rubber tires to ride on the track beam. The conventional straddle-type monorail beam and the rail vehicle 13 are matched as shown in the following figure. Figure 1 As shown, the rail vehicle beam 13 is installed on the conventional rail beam 9, and the running wheels 10, stabilizing wheels 11 and directional wheels 12 arranged on the rail vehicle 13 are all in contact with the conventional rail beam 9, and the conventional rail beam 9 is usually cast with concrete. Compared with ground public transportation, it has the advantages of large transportation capacity, high speed, strong climbing ability, etc., and can also effectively alleviate urban traffic congestion and save people's travel time. In the monorail transportation system, the rail beam has the dual functions of load bearing and vehicle guidance, which is crucial to the monorail transportation system.

[0004] All the monorail transportation projects that have been built in China use prestressed concrete beams and pure steel beam structures. Prestressed concrete rail beams have low construction costs, heavy beam weight, relatively low live load ratio during vehicle operation, and relatively high stability and comfort. However, the straddle-type monorail rail beam is both a load-bearing structure and a running track, which requires high linear accuracy of the beam. In order to achieve millimeter-level prefabrication accuracy and installation accuracy for concrete rail beams, the cost of measures is high and the quality risk is high. Steel structure rail beams can realize standardized panel splitting and factory processing and production. The structural flatness and linear accuracy of rail beams are easy to control. The beams are light in weight, convenient on-site hoisting, and fast in construction. However, steel structure rail beams face a series of problems such as weather resistance of the rail beam running surface, vehicle-bridge coupling vibration, low vehicle running stability, obvious noise, and an overall cost level that is significantly higher than that of concrete rail beams.

[0005] For example, Chinese patent publication number: CN108842530A, a straddle-type monorail double-track composite track beam structure, discloses a steel-concrete composite structure track beam, which can avoid the shortcomings of prestressed concrete track beams and pure steel structure track beams to a certain extent. However, when the span is greater than 65m, in order to meet the stiffness requirements, the steel-concrete composite beam causes extreme waste of web materials and a sharp drop in economic efficiency. It is necessary to develop a large-span straddle-type monorail track beam structure that takes into account both economic efficiency and force-bearing performance. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems existing in the background technology and provide a large-span straddle-type monorail track beam and a construction method thereof, so as to solve the problem of poor economy when the steel-concrete composite structure track beam is used in a large span.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A large-span straddle-type monorail track beam, comprising two track beams arranged opposite to each other, each of the track beams comprising a steel truss, a stabilizing wheel running beam and a walking wheel running beam, the steel truss comprising a lower chord and a web, two webs are connected to the lower chord as a group and form a triangular structure, the tip of the upper part of the triangular structure points to the walking wheel running beam, the walking wheel running beam is arranged on the top of the web, the stabilizing wheel running beam is arranged on the web and is located below the walking wheel running beam, and the stabilizing wheel running beam and the walking wheel running beam are parallel to each other;

[0009] The stabilizing wheel running beam comprises a plurality of cantilever sections and a plurality of middle sections, wherein the middle sections are arranged between each group of web members, and the side of each group of web members away from the middle section is connected to the cantilever section, the cantilever section and the middle section are located in the same horizontal plane, and a first precast concrete section is connected between adjacent cantilever sections;

[0010] The walking wheel running beam comprises a plurality of second precast concrete sections, a connecting steel plate is provided on the top of each group of the web members, and adjacent second precast concrete sections are connected via the connecting steel plates.

[0011] The large-span straddle-type monorail track beam described in the present invention separates the stabilizing wheel running beam and the traveling wheel running beam by using a steel truss as a support, and the stabilizing wheel running beam and the traveling wheel running beam do not need to be directly connected. Compared with the structural form in which the stabilizing wheel running beam and the traveling wheel running beam are set as an integral whole, the large-span straddle-type monorail track beam described in the present invention removes the part between the stabilizing wheel running beam and the traveling wheel running beam in the traditional structure, thereby greatly reducing the weight of the straddle-type monorail track beam itself. Furthermore, the steel truss is combined with the stabilizing wheel running beam and the traveling wheel running beam. The invention fully utilizes the compressive properties of concrete and the tensile properties of steel, effectively reducing the demand for steel in large spans. At the same time, when steel trusses are used in large spans, they save more materials than steel box beam structures, improve material utilization, and have lighter deadweight, which has less impact on the stability of the structure, making the structure more stable. The invention fully combines economy and force performance, solves the problems that traditional prestressed concrete beams are not suitable for large-span structures, pure steel beams have low stiffness and poor stability, and large-span steel-concrete composite beams have poor economy, and is suitable for large-span straddle-type monorail construction operations.

[0012] Preferably, the cantilever section is configured as a U-shaped groove structure, and a corbel is provided on an end surface of the first precast concrete section close to the cantilever section, and the corbel is embedded in the cantilever section.

[0013] Preferably, connecting steel bars are provided in the cantilever section, and a plurality of first extended longitudinal main bars are provided on the end surface of the first precast concrete section close to the cantilever section, and the connecting steel bars are connected to the first extended longitudinal main bars.

[0014] Preferably, shear nails are provided on the inner wall of the cantilever section, and the connecting steel bars are connected to the shear nails.

[0015] Preferably, the corbel is adapted to fit the cantilever section.

[0016] Preferably, the second precast concrete sections are overlapped on the top surfaces of the corresponding connecting steel plates, adjacent second precast concrete sections form connecting grooves at the top surfaces of the connecting steel plates, and the connecting grooves are cast to connect two adjacent second precast concrete sections.

[0017] Preferably, a plurality of second extended longitudinal main reinforcements are provided on the end surface of the second precast concrete section close to the connecting notch, and the second extended longitudinal main reinforcements of adjacent second precast concrete sections are connected in the connecting notch.

[0018] Preferably, a shear nail group is arranged in the connecting notch, and the shear nail group is connected to the top surface of the connecting steel plate.

[0019] Preferably, an upper horizontal link and a lower horizontal link are provided between the track beams on both sides, and a scissor brace is connected between the upper horizontal link and the lower horizontal link.

[0020] The present invention also discloses a construction method for a large-span straddle-type monorail track beam, which is used to construct the large-span straddle-type monorail track beam of the present invention. The construction method comprises the following steps:

[0021] Step S1: assembling the steel trusses, installing the cantilever section, the middle section and the connecting steel plate on each set of the web members, and then installing the upper horizontal link, the lower horizontal link and the scissors brace;

[0022] Step S2: installing the first precast concrete segment: installing the first precast concrete segment on the cantilever segment, with the corbel of the first precast concrete segment embedded in the cantilever segment;

[0023] Step S3: pouring the cantilever section: after the first precast concrete section is installed on the cantilever section, pouring concrete into the cantilever section to complete the construction of the stabilizing wheel running beam;

[0024] Step S4: installing the second precast concrete segment: overlapping the two ends of the second precast concrete segment on the connecting steel plate respectively, and forming connecting notches on the top surface of the connecting steel plate between adjacent second precast concrete segments;

[0025] Step S5: pouring the connecting groove: after the second precast concrete section is installed on the connecting steel plate, and the distance between the second precast concrete section and the stabilizing wheel running beam is adjusted, concrete is poured into the connecting groove to complete the construction of the running wheel running beam.

[0026] The construction method of a large-span straddle-type monorail track beam described in the present invention separates the stabilizing wheel running beam and the traveling wheel running beam through a steel truss, fully utilizing the compressive properties of concrete and the tensile properties of steel, and effectively reducing the demand for steel when the span is large. At the same time, when the steel truss is used in a large span, it saves more materials than a steel box beam structure, thereby improving material utilization and structural stability. At the same time, the assembled construction of the large-span straddle-type monorail is realized, thereby improving construction efficiency.

[0027] The invention discloses a method for constructing a large-span straddle-type monorail track beam, wherein both the running wheel running beam and the stabilizing wheel running beam are constructed by prefabrication and cast-in-place, which greatly simplifies the on-site construction process and saves on-site construction costs.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The large-span straddle-type monorail track beam of the present invention separates the stabilizing wheel running beam and the traveling wheel running beam by using a steel truss as support, and the stabilizing wheel running beam and the traveling wheel running beam do not need to be directly connected. Compared with the structural form in which the stabilizing wheel running beam and the traveling wheel running beam are set as one body, the large-span straddle-type monorail track beam of the present invention removes the part between the stabilizing wheel running beam and the traveling wheel running beam in the traditional structure, thereby greatly reducing the weight of the straddle-type monorail track beam itself. Furthermore, the steel truss is used to connect the stabilizing wheel running beam and the traveling wheel running beam. The combined method fully utilizes the compressive properties of concrete and the tensile properties of steel, effectively reducing the demand for steel when the span is large. At the same time, when the steel truss is used in a large span, it saves more materials than the steel box girder structure, improves the material utilization rate, and the steel truss has a lighter deadweight and has less impact on the stability of the structure, making the structure more stable. The present invention fully combines economy and force performance, solves the problems that traditional prestressed concrete beams are not suitable for large-span structures, pure steel beams have low stiffness and poor stability, and large-span steel-concrete composite beams have poor economy, and is suitable for large-span straddle-type monorail construction operations.

[0030] 2. The large-span straddle-type monorail track beam described in the present invention, the components of the steel truss, the stabilizing wheel running beam and the traveling wheel running beam can all be prefabricated structures, with a high degree of assembly and fast construction efficiency. The prefabricated components are all small in size, and do not require a large prefabricated pedestal. The assembly of the components does not require large lifting equipment, and the on-site construction is convenient, which is conducive to large-scale promotion.

[0031] 3. The construction method of a large-span straddle-type monorail track beam described in the present invention separates the stabilizing wheel running beam and the traveling wheel running beam through a steel truss, fully utilizing the compressive properties of concrete and the tensile properties of steel, effectively reducing the demand for steel when the span is large. At the same time, when the steel truss is used in a large span, it saves more materials than the steel box beam structure, thereby improving the material utilization rate and the stability of the structure. At the same time, the assembled construction of the large-span straddle-type monorail is realized, thereby improving the construction efficiency.

[0032] 4. In the construction method of a large-span straddle-type monorail track beam described in the present invention, both the running wheel running beam and the stabilizing wheel running beam are constructed by prefabrication and cast-in-place, which greatly simplifies the on-site construction process and saves on-site construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the cooperation between a conventional straddle-type monorail beam and a rail vehicle in the background technology.

[0034] Figure 2 It is a structural schematic diagram of the present invention.

[0035] Figure 3 yes Figure 2AA section view.

[0036] Figure 4 yes Figure 2 A partial enlarged view of point D.

[0037] Figure 5 yes Figure 4 B view.

[0038] Figure 6 yes Figure 5 CC section view.

[0039] Figure 7 yes Figure 5 DD section view.

[0040] Figure 8 yes Figure 2 A partial enlarged view of point E.

[0041] Fig. 9 yes Figure 2 Bottom view of .

[0042] Fig.10 It is a schematic diagram of the cooperation between the large-span straddle-type monorail track beam and the rail vehicle described in the present invention.

[0043] Fig.11 This is a construction diagram of the present invention. Figure 1 .

[0044] Fig.12 This is a construction diagram of the present invention. Figure 2 .

[0045] Fig.13 This is a construction diagram of the present invention. Figure 3 .

[0046] Markings in the figure: 1-track beam, 2-steel truss, 21-lower chord, 22-web bar, 3-stable wheel running beam, 31-cantilever section, 32-first precast concrete section, 321-corbel, 33-middle section, 4-traveling wheel running beam, 41-second precast concrete section, 42-connecting steel plate, 43-connecting notch, 5-upper parallel joint, 6-lower parallel joint, 7-scissors brace, 8-diagonal rod, 9-conventional track beam, 10-traveling wheel, 11-stable wheel, 12-directional wheel, 13-rail vehicle. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0048] Example 1

[0049] like Figure 2-Figure 3 , Fig.10 As shown, a large-span straddle-type monorail track beam described in this embodiment includes two track beams 1 arranged opposite to each other, each track beam 1 includes a steel truss 2, a stabilizing wheel running beam 3 and a walking wheel running beam 4, the steel truss 2 includes a lower chord 21 and a web 22, two webs 22 are connected to the lower chord 21 as a group and form a triangular structure, the upper tip of the triangular structure points to the walking wheel running beam 4, the walking wheel running beam 4 is arranged on the top of the web 22, the stabilizing wheel running beam 3 is arranged on the web 22 and is located below the walking wheel running beam 4, and the stabilizing wheel running beam 3 and the walking wheel running beam 4 are parallel to each other;

[0050] The stabilizing wheel running beam 3 includes a plurality of cantilever sections 31, a plurality of middle sections 33 and a plurality of first precast concrete sections 32. The middle sections 33 are arranged between each group of web members 22. The side of each group of web members 22 away from the middle section 33 is connected to the cantilever section 31. The cantilever section 31 and the middle section 33 are located in the same horizontal plane. The first precast concrete sections 32 are connected between adjacent cantilever sections 31.

[0051] The running wheel running beam 4 includes a plurality of second precast concrete sections 41 . A connecting steel plate 42 is provided on the top of each web member 22 , and adjacent second precast concrete sections 41 are connected via the connecting steel plates 42 .

[0052] The large-span straddle-type monorail track beam described in this embodiment separates the stabilizing wheel running beam 3 and the traveling wheel running beam 4 through the steel truss 2. The stabilizing wheel running beam 3 and the traveling wheel running beam 4 do not need to be directly connected. Compared with the traditional structure in which the stabilizing wheel running beam 3 and the traveling wheel running beam 4 are set as one body, the large-span straddle-type monorail track beam described in this embodiment removes the part between the stabilizing wheel running beam 3 and the traveling wheel running beam 4 in the traditional structure, thereby greatly reducing the weight of the straddle-type monorail track beam itself. Furthermore, the steel truss 2 and The combination of the stabilizing wheel running beam 3 and the walking wheel running beam 4 fully utilizes the compressive properties of concrete and the tensile properties of steel, effectively reducing the demand for steel when the span is large. At the same time, the steel truss 2 is more material-saving than the steel box beam structure when used in a large span, thereby improving the material utilization rate and the stability of the structure. The present invention fully combines economy and force performance, solves the problems that traditional prestressed concrete beams are not suitable for large-span structures, pure steel beams have low stiffness and poor stability, and large-span steel-concrete composite beams have poor economy, and is suitable for large-span straddle-type monorail construction operations.

[0053] A preferred method is as follows Figure 4-Figure 7 As shown, the cantilever section 31 is set as a U-shaped channel structure. During construction, the cantilever section 31 can be made of channel steel, and the cantilever section 31 is welded to the web member 22. Figure 5-Figure 6As shown, the U-shaped groove of the cantilever section 31 faces upward. After the cantilever section 31 is connected to the first precast concrete section 32, the outer side surface of the cantilever section 31 serves as the running surface of the stabilizing wheel 11 of the rail vehicle 13. Furthermore, in order to make the cantilever section 31 firmly connected to the web member 22, the three sides of the cantilever section 31 are fully welded to the web member 22 during welding. In order to facilitate the installation of the first precast concrete section 32 on the cantilever section 31, a bracket 321 is provided on the end surface of the first precast concrete section 32 close to the cantilever section 31. The bracket 321 is a boss of the first precast concrete section 32. When installing the first precast concrete section 32, the bracket 321 is embedded in the cantilever section 31, so that the first precast concrete section 32 is installed on the web member 22, and then the stabilizing wheel running beam 3 is installed on the steel truss 2.

[0054] In a preferred manner, the structural dimensions of the corbel 321 are matched with the structural dimensions of the inner wall of the cantilever section 31 , thereby facilitating the installation of the corbel 321 in the cantilever section 31 .

[0055] In a preferred manner, after the corbel 321 of the first precast concrete section 32 is installed in the cantilever section 31, in order to make the connection between the corbel 321 of the first precast concrete section 32 and the cantilever section 31 more firmly, the U-shaped groove of the cantilever section 31 is filled by pouring concrete, so that the first precast concrete section 32 and the cantilever section 31 are connected as a whole, which is stronger and more firm.

[0056] In a preferred manner, the middle section 33 of the stabilizing wheel running beam 3 is a rectangular steel tube, both ends of which are welded to the web member 22 .

[0057] In a preferred manner, the connecting steel plate 42 is welded to the top of the web member 22 .

[0058] A preferred method is as follows Figure 8 As shown, the second precast concrete sections 41 are overlapped on the top surfaces of the corresponding connecting steel plates 42, and connecting grooves 43 are formed at the top surfaces of the connecting steel plates 42 between the adjacent second precast concrete sections 41. The connecting grooves 43 are cast to connect the two adjacent second precast concrete sections 41, and the adjacent second precast concrete sections 41 are connected together through the connecting steel plates 42, thereby realizing the installation of the walking wheel running beam 4. Furthermore, since the connecting steel plates 42 are welded to the top of the web members 22, the walking wheel running beam 4 is installed on the top of the web members 22 through the connecting steel plates 42, thereby realizing the installation of the walking wheel running beam 4 on the steel truss 2.

[0059] A preferred method is as follows Figure 3As shown, an upper flat link 5 and a lower flat link 6 are arranged between the two track beams 1, and the two track beams 1 are connected by the upper flat link 5 and the lower flat link 6. The two ends of the upper flat link 5 are respectively welded to the two corresponding web members 22 of the two track beams 1, and the upper flat link 5 is located below the stabilizing wheel running beam 3, and the lower flat link 6 is welded to the corresponding two lower chords 21. Each upper flat link 5 and a lower flat link 6 form a group, and a plurality of groups of upper flat links 5 and lower flat links 6 are arranged along the length direction of the track beam 1 to effectively connect and support the two track beams 1. Furthermore, a scissors brace 7 is welded between each group of the upper flat link 5 and the lower flat link 6, and the scissors brace 7 is used to reduce the stress and deformation of the upper flat link 5 and the lower flat link 6.

[0060] A preferred method is as follows Fig. 9 As shown, an oblique rod 8 is further provided between the lower chord rod 21 and the lower horizontal link 6. The oblique rod 8 is connected with the lower chord rod 21 and the lower horizontal link 6 to form a triangular structure, so that the connection between the lower chord rods 21 is more firm, thereby making the connection between the track beams 1 reliable.

[0061] In a preferred manner, the lower chord 21 is formed by splicing a plurality of single-section chords by bolts, and the web 22 is bolted to the lower chord 21 .

[0062] Example 2

[0063] On the basis of implementation 1, if Figure 5-Figure 7 As shown, this embodiment optimizes the connection method between the cantilever section 31 and the first precast concrete section 32. Connecting steel bars are welded in the cantilever section 31. A plurality of first extended longitudinal main bars are reserved at the end face of the first precast concrete section 32 close to the cantilever section 31. The connecting steel bars are tied or welded to the first extended longitudinal main bars, so that the cantilever section 31 and the first precast concrete section 32 are more firmly connected.

[0064] A preferred method is as follows Figure 6 As shown, a plurality of shear nails are welded on the inner wall of the cantilever section 31, and the connecting steel bar is arranged perpendicular to the length direction of the cantilever section 31. The two ends of the connecting steel bar are respectively welded to the shear nails on the inner walls on both sides of the cantilever section 31, thereby ensuring that the connecting steel bar is connected to the cantilever section 31 as a whole.

[0065] Example 3

[0066] On the basis of implementation 1, this embodiment optimizes the connection method of the second precast concrete segment 41 at the connecting groove 43, and a plurality of second extended longitudinal main reinforcements are arranged on the end face of the second precast concrete segment 41 close to the connecting groove 43, and the second extended longitudinal main reinforcements of adjacent second precast concrete segments 41 are welded and connected in the connecting groove 43, so that the adjacent second precast concrete segments 41 are firmly connected.

[0067] A preferred method is as follows Figure 8 As shown, a shear nail group is arranged in the connection groove 43, and the shear nail group is connected to the top surface of the connection steel plate 42. By arranging the shear nail group on the connection steel plate 42, the connection steel plate 42 can be firmly fixed on the connection groove 43 after the connection groove 43 is cast.

[0068] Example 4

[0069] like Figure 11-13 As shown, based on Examples 1 to 3, this embodiment discloses a construction method for a large-span straddle-type monorail track beam, which is used to construct a large-span straddle-type monorail track beam as described in Examples 1 to 3. The construction method comprises the following steps:

[0070] Step S1: assembling the steel truss 2, welding the cantilever section 31, the middle section 33 and the connecting steel plate 42 on each set of web members 22, and then installing the upper horizontal link 5, the lower horizontal link 6 and the scissor brace 7;

[0071] Step S2: installing the first precast concrete segment 32: installing the first precast concrete segment 32 on the cantilever segment 31, embedding the bracket 321 of the first precast concrete segment 32 into the cantilever segment 31, and welding the connecting steel bars in the cantilever segment 31 to the first outer longitudinal main bars of the first precast concrete segment 32;

[0072] Step S3: pouring the cantilever section 31: after the first precast concrete section 32 is installed on the cantilever section 31, pouring concrete into the cantilever section 31 to complete the construction of the stabilizing wheel running beam 3;

[0073] Step S4: installing the second precast concrete segment 41: overlapping the two ends of the second precast concrete segment 41 on the connecting steel plate 42 respectively, forming a connecting notch 43 at the top surface of the connecting steel plate 42 between adjacent second precast concrete segments 41, and welding the second outer longitudinal main reinforcements of the adjacent second precast concrete segments 41 together in the connecting notch 43;

[0074] Step S5: pouring the connecting notch 43: after the second precast concrete section 41 is installed on the connecting steel plate 42, and the distance between the second precast concrete section 41 and the stabilizing wheel running beam 3 is adjusted, concrete is poured into the connecting notch 43 to complete the construction of the running wheel running beam 4.

[0075] A construction method for a large-span straddle-type monorail track beam described in this embodiment, when installing the running wheel running beam 4, after the second precast concrete section 41 is installed on the connecting steel plate 42, the distance between the second precast concrete section 41 and the stabilizing wheel running beam 3 is adjusted so that the second precast concrete section 41 remains parallel to the stabilizing wheel running beam 3, thereby ensuring that the running wheel running beam 4 remains parallel to the stabilizing wheel running beam 3 after construction is completed.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-span straddle-type monorail track beam, comprising two track beams (1) arranged opposite to each other, It is characterized in that Each track beam (1) comprises a steel truss (2), a stabilizing wheel running beam (3) and a walking wheel running beam (4); the steel truss (2) comprises a lower chord (21) and a web (22); two webs (22) are connected to the lower chord (21) as a group and form a triangular structure, the tip of the upper part of the triangular structure points to the walking wheel running beam (4); the walking wheel running beam (4) is arranged on the top of the web (22); the stabilizing wheel running beam (3) is arranged on the web (22) and is located below the walking wheel running beam (4); the stabilizing wheel running beam (3) and the walking wheel running beam (4) are parallel to each other; The stabilizing wheel running beam (3) comprises a plurality of cantilever sections (31) and a plurality of middle sections (33), wherein the middle sections (33) are arranged between each group of web members (22), and the side of each group of web members (22) away from the middle sections (33) is connected to the cantilever section (31), the cantilever section (31) and the middle sections (33) are located in the same horizontal plane, and a first precast concrete section (32) is connected between adjacent cantilever sections (31); The walking wheel running beam (4) comprises a plurality of second precast concrete sections (41), a connecting steel plate (42) is provided on the top of each group of web members (22), and adjacent second precast concrete sections (41) are connected via the connecting steel plates (42).

2. A large-span straddle-type monorail track beam according to claim 1, It is characterized in that The cantilever section (31) is configured as a U-shaped groove structure, and a corbel (321) is provided on the end surface of the first precast concrete section (32) close to the cantilever section (31), and the corbel (321) is embedded in the cantilever section (31).

3. A large-span straddle-type monorail track beam according to claim 2, It is characterized in that The cantilever section (31) is provided with connecting steel bars, and the end surface of the first precast concrete section (32) close to the cantilever section (31) is provided with a plurality of first external longitudinal main bars, and the connecting steel bars are connected to the first external longitudinal main bars.

4. A large-span straddle-type monorail track beam according to claim 3, It is characterized in that Shear nails are arranged on the inner wall of the cantilever section (31), and the connecting steel bars are connected to the shear nails.

5. The large-span straddle-type monorail track beam according to claim 2, It is characterized in that The corbel (321) is adapted to the cantilever section (31).

6. The large-span straddle-type monorail track beam according to claim 1, It is characterized in that The second precast concrete sections (41) are overlapped on the top surfaces of the corresponding connecting steel plates (42), and adjacent second precast concrete sections (41) form connecting grooves (43) on the top surfaces of the connecting steel plates (42), and the connecting grooves (43) are cast to connect two adjacent second precast concrete sections (41).

7. A large-span straddle-type monorail track beam according to claim 6, It is characterized in that A plurality of second extended longitudinal main reinforcements are arranged on the end surface of the second precast concrete section (41) close to the connecting notch (43), and the second extended longitudinal main reinforcements of adjacent second precast concrete sections (41) are connected in the connecting notch (43).

8. The large-span straddle-type monorail track beam according to claim 6, It is characterized in that A shear nail group is arranged in the connection notch (43), and the shear nail group is connected to the top surface of the connection steel plate (42).

9. A large-span straddle-type monorail track beam according to any one of claims 1 to 8, It is characterized in that An upper horizontal link (5) and a lower horizontal link (6) are arranged between the track beams (1) on both sides, and a scissor brace (7) is connected between the upper horizontal link (5) and the lower horizontal link (6).

10. A construction method for a large-span straddle-type monorail track beam, It is characterized in that For constructing a large-span straddle-type monorail track beam as claimed in claim 9, the construction method comprises the following steps: Step S1: assembling the steel truss (2), installing the cantilever section (31), the middle section (33) and the connecting steel plate (42) on each group of the web members (22), and then installing the upper parallel joint (5), the lower parallel joint (6) and the scissor brace (7); Step S2: installing the first precast concrete section (32): installing the first precast concrete section (32) on the cantilever section (31), wherein the corbel (321) of the first precast concrete section (32) is embedded in the cantilever section (31); Step S3: pouring the cantilever section (31): after the first precast concrete section (32) is installed on the cantilever section (31), pouring concrete into the cantilever section (31) to complete the construction of the stabilizing wheel running beam (3); Step S4: installing the second precast concrete segment (41): overlapping the two ends of the second precast concrete segment (41) on the connecting steel plate (42) respectively, and forming connecting notches (43) on the top surface of the connecting steel plate (42) between adjacent second precast concrete segments (41); Step S5: pouring the connecting groove (43): after the second precast concrete section (41) is installed on the connecting steel plate (42), and the distance between the second precast concrete section (41) and the stabilizing wheel running beam (3) is adjusted, concrete is poured into the connecting groove (43) to complete the construction of the running wheel running beam (4).

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