A space grid steel truss beam suitable for suspended monorail and a construction method thereof

Abstract

The present invention provides a space grid steel truss beam suitable for a suspended monorail, comprising a space curved grid and a track beam, wherein the track beam is arranged throughout the space curved grid, and a track beam suspension assembly is arranged inside the space curved grid, and the top of the track beam is connected to the space curved grid through the track beam suspension assembly, and approach bridge piers are arranged below both ends of the track beam, and a portal arch ring is arranged on the space curved grid at the beam end support pier position, and the portal arch ring is connected to the approach bridge pier through a pier body column. In addition, the present invention also provides a construction method for the space grid steel truss beam. After the invention is strengthened by the space curved grid, the spanning capacity of the suspended monorail is significantly improved, and the demand for a large span of the bridge span structure at control nodes such as the need for the bridge to cross some larger intersections can be met, and the appearance is beautiful and can better meet the needs of urban landscape.

Description

Technical Field

[0001] The invention belongs to the technical field of urban rail transit bridges, and in particular relates to a space grid steel truss beam suitable for a suspended monorail and a construction method thereof. Background Art

[0002] As a new type of rail transit technology, the track beam of the suspended monorail is not only a load-bearing component, but also serves as a running and guiding track. Since the track beam steel thin-walled section has an open bottom, its torsional stiffness is relatively low, so the safety and comfort of train operation are difficult to ensure; in addition, the vehicle system has strict requirements on the deformation of the track beam under the action of train loads. Due to the rigidity of the track beam section, the applicable span range of the track beam is also severely limited. When the bridge needs to cross some large intersections and other control nodes, new structural forms must be sought to meet the needs of large spans of bridge span structures.

[0003] According to the current research on suspended rail transit at home and abroad, all countries mainly use conventional spans and conventional bridge spans, and spans of more than 30 meters are rarely seen. How to improve the span capacity of the bridge structure as much as possible while meeting the stiffness and deformation of the track beam and ensuring driving safety and comfort, while taking into account the landscape, has become an urgent problem that suspended rail transit needs to consider and solve. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of the existing suspended rail transit bridge having a single structural form and limited spanning capacity.

[0005] To this end, the present invention provides a spatial grid steel truss suitable for a suspended monorail, comprising a spatial curved grid and a track beam, wherein the track beam is arranged through the spatial curved grid, and a track beam suspension assembly is provided inside the spatial curved grid, the top of the track beam is connected to the spatial curved grid via the track beam suspension assembly, approach bridge piers are provided below both ends of the track beam, a portal arch ring is provided on the spatial curved grid at the beam end pier position, and the portal arch ring is connected to the approach bridge pier via pier body columns.

[0006] Furthermore, the spatial curved surface grid is a grid structure approximately in the shape of an ellipse formed by a plurality of grid spiral rods, and the grid spiral rods are welded at grid nodes.

[0007] Furthermore, the portal arch ring is arranged perpendicularly to the axis of the spatial curved surface grid.

[0008] Furthermore, the portal arch ring is composed of a plurality of annular skeletons distributed at equal intervals along the axial direction of the spatial curved surface grid, and the annular skeletons and the spatial curved surface grid intersect at grid nodes.

[0009] Furthermore, the track beam suspension assembly includes an upper chord and a plurality of rigid suspension point ear plates located at the top of the track beam and arranged at equal intervals along the axial direction of the track beam; the upper chord is connected to the inner surface of the spatial curved grid, and the upper chord is arranged parallel to the axis of the track beam, and the upper chord is bolted to the rigid suspension point ear plates.

[0010] Furthermore, when the track beam is a curved track beam, a cross beam is arranged on the upper chord in its curved section, and the curved track beam is connected to the upper chord through the cross beam.

[0011] Furthermore, the spatial curved grid is provided with a lower chord near its lower edge.

[0012] Furthermore, the track beam is a thin-walled cross-section structure with an open lower edge.

[0013] In addition, the present invention also provides a construction method for the above-mentioned space grid steel truss beam applicable to the suspended monorail, comprising the following steps:

[0014] 1) On-site construction of foundation and approach bridge piers;

[0015] 2) Factory prefabricated track beams, space curved grids, track beam suspension components and portal arches; wherein the space curved grid is welded into a whole by grid spiral rods, the track beam suspension components include upper chord rods and rigid suspension point ear plates, the upper chord rods are fully welded to the space curved grid, the rigid suspension point ear plates are welded to the top of the track beam and are arranged at equal intervals along the axial direction of the track beam, and the portal arches are welded to both ends of the space curved grid;

[0016] 3) Install the support, transport the assembled and welded track beam and spatial curved surface grid to the construction site, hoist and splice them, bolt the upper chord on the spatial curved surface grid to the rigid lifting point ear plate on the track beam, and connect the portal arch ring on the spatial curved surface grid to the approach bridge pier through the pier body column to complete the erection.

[0017] Furthermore, the track beam is a curved track beam. When hoisting and splicing at the construction site, the curved section of the track beam is adapted to the curve by adjusting the lateral position of the fixing point of the track beam and the upper chord. For a large curve radius, a crossbeam is provided on the upper chord, and the curved section of the track beam is connected to the upper chord through the crossbeam.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) After the spatial grid steel truss suitable for the suspended monorail provided by the present invention is reinforced by the spatial curved grid, the spanning capacity of the suspended monorail is significantly improved, which can meet the demand for a large span of the bridge structure at control nodes such as the need for the bridge to cross some larger intersections, and has a beautiful appearance and can better meet the needs of urban landscape.

[0020] (2) The spatial grid steel truss beam suitable for the suspended monorail provided by the present invention connects the originally separated track beam with the spatial curved grid through rigid hanging points as a whole, and directly transfers the load to the pier column and the lower structure through the portal arch ring formed by the annular skeleton, so that the force is more clearly received. At the same time, the existence of the rigid hanging points divides the track beam into several small spans distributed at equal intervals, thereby solving the problem of limited torsional stiffness caused by the small cross-section of the suspended monorail, greatly improving the overall comfort of the ride, and relaxing the requirements of the traditional bridge span structure on the size and structure of the track beam, so that the track beam has more possibilities for changes.

[0021] (3) The spatial curved grid structure in the spatial grid steel truss suitable for suspended monorail provided by the present invention may appear complex in appearance, but each section can actually be simplified into several types of standardized components, which are convenient for unified processing and manufacturing. In addition, each rod is connected by welding, which weakens the bolt connection, effectively avoiding the risk of bolt falling off during driving to driving safety.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of a space grid steel truss beam applicable to a suspended monorail according to the present invention;

[0024] Figure 2 It is a schematic elevation view of a space grid steel truss beam applicable to a suspended monorail according to the present invention;

[0025] Figure 3 It is a plan view of a space grid steel truss beam applicable to a suspended monorail according to the present invention;

[0026] Figure 4 It is a front schematic diagram of a space grid steel truss beam applicable to a suspended monorail according to the present invention.

[0027] Explanation of the reference numerals: 1. Track beam; 2. Space curved grid; 3. Upper chord; 4. Lower chord; 5. Pier column; 6. Approach bridge pier; 7. Rigid suspension point ear plate; 8. Grid spiral rod; 9. Annular frame. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, unless otherwise specified, "multiple" and "several" mean two or more.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a space grid steel truss suitable for a suspended monorail, including a space curved grid 2 and a track beam 1, wherein the track beam 1 is arranged throughout the space curved grid 2, and a track beam suspension assembly is arranged inside the space curved grid 2, the top of the track beam 1 is connected to the space curved grid 2 through the track beam suspension assembly, approach bridge piers 6 are arranged below both ends of the track beam 1, and a portal arch ring is arranged on the space curved grid 2 at the beam end pier position, and the portal arch ring is connected to the approach bridge pier 6 through the pier body column 5. In this embodiment, the originally separated track beam 1 is connected as a whole with the spatial curved grid 2 through the track beam suspension assembly. After being strengthened by the spatial curved grid 2, the spanning capacity of the suspended monorail is significantly improved, thereby meeting the demand for a large span structure at control nodes such as the need for bridges to cross some larger intersections; and as for its force, through the setting of the track beam suspension assembly, the load borne by the track beam 1 is transmitted to the spatial curved grid 2 through the track beam suspension assembly, and then transmitted to the pier body column 5 and the approach bridge pier 6 through the portal arch ring, and the force is more clear.

[0031] Refine the structure of the space curved grid 2, such as Figure 2 , Figure 3 and Figure 4 As shown, the spatial curved grid 2 is a grid structure approximately elliptical formed by a plurality of grid spiral rods 8, and the grid spiral rods 8 are welded at the grid nodes; in this embodiment, the spatial curved grid 2 is used to replace the web rods, upper flat joints and lower flat joints of conventional steel trusses, and the appearance structure is more concise, and the strength of the grid structure is fully utilized to enable it to participate in the overall force. Although the structure of the spatial curved grid 2 appears to have many and complex steel components, each internode can actually be simplified into several large categories of standardized components, which is convenient for unified processing and manufacturing, and the grid spiral rods 8 are connected by welding, which weakens the bolt connection and effectively avoids the risk of bolt falling off during driving to driving safety.

[0032] Specifically, the track beam suspension assembly includes an upper chord 3 and a plurality of rigid suspension point ear plates 7 located at the top of the track beam 1 and arranged at equal intervals along the axial direction of the track beam 1; the upper chord 3 is connected to the inner surface of the spatial curved grid 2, and the upper chord 3 is arranged parallel to the axis of the track beam 1, and the upper chord 3 is bolted to the rigid suspension point ear plates 7. In this embodiment, the track beam 1 and the upper chord 3 are fixed on the top of the spatial curved surface grid 2. The upper chord 3 not only provides the wheel-rail running function, but also participates in the overall force of the steel truss as a combined upper chord, thereby reducing the structural deformation of the spatial curved surface grid 2; at the same time, the track beam 1 is suspended by a number of rigid suspension point ear plates 7 evenly distributed at the upper part. Compared with the conventional span bridge structure, it is equivalent to being divided into many track beams with very small spans, thereby solving the problem of limited torsional stiffness caused by the small cross-section of the suspended monorail, greatly improving the overall comfort of the ride, and relaxing the requirements of the traditional bridge span structure on the size and structure of the track beam 1, so that the form of the track beam 1 has more possibilities for changes. Therefore, the track beam 1 can adopt a thin-walled cross-section structure with an open lower edge.

[0033] Optimally, a lower chord 4 is provided near the lower edge of the spatial curved surface grid 2 to help reduce the structural deformation of the spatial curved surface grid 2 so as to further achieve a larger span.

[0034] Refine the structure of the portal arch ring, such as Figure 2 and Figure 3 As shown, the portal arch ring is composed of a plurality of annular skeletons 9 equidistantly distributed along the axial direction of the spatial curved surface grid 2. The annular skeletons 9 are arranged perpendicular to the axis of the spatial curved surface grid 2, and the annular skeletons 9 and the spatial curved surface grid 2 intersect at the grid node. The arrangement of the annular skeletons 9 improves the concentrated stress state of the beam end, and can also serve as a support point for the side span beam.

[0035] In addition, the realization of the space grid steel truss beam suitable for the suspended monorail depends on the standardized production of the components in the factory. Before implementation, the steel components constituting the space grid steel truss beam are classified and uniformly processed and manufactured in the factory. The specific construction process is as follows:

[0036] (1) On-site construction of foundation and approach bridge pier 6. This construction process is prior art and will not be described in detail here.

[0037] (2) Factory prefabricated track beam 1, space curved grid 2, track beam suspension assembly and portal frame arch ring. Among them, the space curved grid 2 is made of grid spiral rods 8 that are fully welded into a whole; the track beam suspension assembly includes upper chord rods 3 and rigid suspension point ear plates 7, the upper chord rods 3 are fully welded to the space curved grid 2, the rigid suspension point ear plates 7 are welded to the top of the track beam 1 and are arranged at equal intervals along the axial direction of the track beam 1; the portal frame arch ring is welded to both ends of the space curved grid 2, and the portal frame arch ring is composed of multiple annular frames 9. Of course, the assembly and welding of the track beam 1 and the space curved grid 2 can be transported in sections and welded on site according to the on-site lifting capacity.

[0038] (3) Install the support, transport the assembled and welded track beam 1 and the spatial curved surface grid 2 to the construction site, hoist and splice them, bolt the upper chord 3 on the spatial curved surface grid 2 to the rigid lifting point ear plate 7 on the track beam 1, and connect the portal arch ring on the spatial curved surface grid 2 to the approach bridge pier 6 through the pier body column 5 to complete the erection.

[0039] Furthermore, when the track beam 1 is a curved track beam, during hoisting and splicing at the construction site, the curved section of the track beam 1 can be adapted to the curve by adjusting the lateral position of the fixed points of the track beam 1 and the upper chord 3; and for a large curve radius, a crossbeam can be provided on the upper chord 3, and the curved section of the track beam 1 is connected to the upper chord 3 via the crossbeam.

[0040] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A space grid steel truss beam suitable for a suspended monorail, characterized in that: It includes a spatial curved surface grid and a track beam, wherein the track beam is penetrated and arranged in the spatial curved surface grid, and a track beam suspension component is arranged inside the spatial curved surface grid, and the top of the track beam is connected to the spatial curved surface grid through the track beam suspension component, and bridge approach piers are arranged below both ends of the track beam, and a portal frame arch ring is arranged on the spatial curved surface grid at the position of the beam end pier, and the portal frame arch ring is connected to the bridge approach pier through the pier body column; the spatial curved surface grid is a grid structure approximately elliptical composed of a plurality of grid spiral rods, and the grid spiral rods are welded at the grid nodes; the spatial curved surface grid is provided with a lower chord rod near its lower edge.

2. A space grid steel truss beam suitable for a suspended monorail as claimed in claim 1, characterized in that: The portal arch ring is arranged perpendicularly to the axis of the space curved surface grid.

3. A space grid steel truss beam suitable for a suspended monorail as claimed in claim 2, characterized in that: The portal arch ring is composed of a plurality of annular skeletons distributed at equal intervals along the axial direction of the space curved surface grid, and the annular skeletons and the space curved surface grid intersect at grid nodes.

4. The space grid steel truss beam suitable for a suspended monorail according to claim 1, characterized in that: The track beam suspension assembly includes an upper chord and a plurality of rigid suspension point ear plates located at the top of the track beam and arranged at equal intervals along the axial direction of the track beam; the upper chord is connected to the inner surface of the spatial curved grid, and the upper chord is arranged parallel to the axis of the track beam, and the upper chord is bolted to the rigid suspension point ear plates.

5. The space grid steel truss beam suitable for a suspended monorail according to claim 4, characterized in that: When the track beam is a curved track beam, it is located in its curved section, and a cross beam is arranged on the upper chord, through which the curved track beam is connected to the upper chord.

6. The space grid steel truss beam suitable for a suspended monorail according to claim 1, characterized in that: The track beam is a thin-walled cross-section structure with an open lower edge.

7. A construction method for a space grid steel truss beam suitable for a suspended monorail as claimed in any one of claims 1 to 6, characterized in that: The steps include: 1) On-site construction of foundation and approach bridge piers; 2) Factory prefabricated track beams, space curved grids, track beam suspension components and portal arches; wherein the space curved grid is welded into a whole by grid spiral rods, the track beam suspension components include upper chord rods and rigid suspension point ear plates, the upper chord rods are fully welded to the space curved grid, the rigid suspension point ear plates are welded to the top of the track beam and are arranged at equal intervals along the axial direction of the track beam, and the portal arches are welded to both ends of the space curved grid; 3) Install the support, transport the assembled and welded track beam and spatial curved surface grid to the construction site, hoist and splice them, bolt the upper chord on the spatial curved surface grid to the rigid lifting point ear plate on the track beam, and connect the portal arch ring on the spatial curved surface grid to the approach bridge pier through the pier body column to complete the erection.

8. A construction method for a space grid steel truss beam suitable for a suspended monorail as claimed in claim 7, characterized in that: The track beam is a curved track beam. When hoisting and splicing at the construction site, the curved section of the track beam is adapted to the curve by adjusting the lateral position of the fixing point of the track beam and the upper chord. For large curve radius, a crossbeam is provided on the upper chord, and the curved section of the track beam is connected to the upper chord through the crossbeam.

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