Arch-shaped large-span cable bridge with triangular cross section and installation method thereof

Abstract

The application discloses a kind of arch-shaped large-span cable bridge of triangular cross section and installation method thereof, including the arch-shaped bridge that is arched upward and presents arc-shaped structure, cable protection pipe and / or communication protection pipe are laid in the arch-shaped bridge inside along its length trajectory direction, the cross section of the arch-shaped bridge along its length trajectory direction presents triangular structure, the arch-shaped bridge that is arched upward and presents arc-shaped structure sag-span ratio is 0.1~1.0;The cross section of arch-shaped bridge adopts isosceles triangle structure, can satisfy the requirement of cable laying, and the vertical load and transverse horizontal wind load of bridge are possibly reduced to maximum;With the sag-span ratio of 0.1~1.0 arch-shaped longitudinal section, bearing capacity is good, and deformation control is good;The upper chord truss main steel pipe of arch-shaped bridge, lower chord truss single-side chord and lower chord truss opposite side chord are all made of round steel pipe, and wind resistance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable bridge, in particular to an arch-shaped large-span cable bridge with a triangular cross section and a mounting method thereof. BACKGROUND

[0002] When a city power cable channel encounters a river, a spanning cable bridge, an underwater cable or a non-excavation method is usually used to pass through the ground soil under the river. When a cable bridge is used, a rectangular truss type or a truss with an arch-shaped bridge structure is currently used.

[0003] The currently popular bridge in China is a rectangular truss spanning type or a rectangular truss with an arch-shaped structure spanning type. For example, a large-span arch-shaped high-voltage power cable bridge is disclosed in a Chinese patent with the patent publication number CN208738800U announced on April 12, 2019, which is an arch-shaped bridge that can realize a large-span cable bridge laying.

[0004] For example, a steel angle lattice type large-span outdoor cable bridge is disclosed in a Chinese patent with the patent publication number CN213547060U announced on June 25, 2021, which is provided with a vertical upward pre-arch to prevent the bridge from deforming under the long-term action of self-weight and cable load, and can be used in large-span sections. The outer contour of the partition is rectangular, and the inner contour is a triangular support frame connected by members.

[0005] The rectangular cross section is used to arrange the vertical load on the single truss on both sides, and the vertical stress is clear. However, due to the full arrangement of the pipe in the bridge, the windward area is large, and when the bridge span is large, the horizontal wind load often becomes a constraint factor of the truss structure, which makes the horizontal inclined support structure of the bridge structure more complex. And controlled by the ratio of the maximum deflection to the span (support point distance) being 1 / 250~1 / 150, the deflection of the simply supported truss bridge does not meet the requirements, and the stiffness of the bridge often needs to be increased, resulting in a sharp increase in investment. SUMMARY

[0006] The present application aims to provide an arch-shaped large-span cable bridge with a triangular cross section and a mounting method thereof to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] An arch-shaped large-span cable bridge with a triangular cross section, comprising an arch-shaped bridge with an upwardly arched arc structure, a cable protection pipe and / or a communication protection pipe being laid inside the arch-shaped bridge along the length trajectory direction thereof, and the cross section of the arch-shaped bridge along the length trajectory direction thereof being in a triangular structure, and the arch-shaped bridge with an upwardly arched arc structure having a rise-span ratio of 0.1-1.0.

[0009] Preferably, the triangular cross section of the arch-shaped bridge is an isosceles triangle.

[0010] Preferably, the arch-shaped bridge is provided with a diagonal abutment support at each end, and the diagonal abutment support is fixed on the top of the abutment.

[0011] Preferably, the bottom of the abutment is provided with a plurality of bridge foundation cast-in-place piles embedded in the ground.

[0012] Preferably, the inclined surface of the diagonal abutment support is pre-embedded with a bridge pre-embedded part, and the end of the arch-shaped bridge is fixed to the inclined surface of the diagonal abutment support through the bridge pre-embedded part.

[0013] Preferably, the angle between the inclined surface of the diagonal abutment support and the horizontal plane is 45°.

[0014] Preferably, the arch-shaped bridge comprises upper chord truss main steel pipes, single-side chord bars of lower chord trusses and opposite-side chord bars of lower chord trusses arranged in an acute triangle, and the upper chord truss main steel pipes, the single-side chord bars of lower chord trusses and the opposite-side chord bars of lower chord trusses are fixedly connected to each other through vertical and / or inclined web members.

[0015] Preferably, the upper chord truss main steel pipes, the single-side chord bars of lower chord trusses and the opposite-side chord bars of lower chord trusses are circular steel pipes.

[0016] Preferably, the cable protection pipe and / or the communication protection pipe are fixedly installed on the web members through flat steel and flat steel fastening clamps.

[0017] A method for installing an arch-shaped large-span cable bridge with a triangular cross section, comprising the following steps:

[0018] Cold bending the main pipe components on site to form upper chord truss main steel pipes, single-side chord bars of lower chord trusses and opposite-side chord bars of lower chord trusses;

[0019] Welding the upper chord truss main steel pipes, the single-side chord bars of lower chord trusses and the opposite-side chord bars of lower chord trusses to each other through web members to form an arch-shaped bridge;

[0020] Embedding bridge foundation cast-in-place piles in the ground, and sequentially installing an abutment and a diagonal abutment support on the upper end of the bridge foundation cast-in-place piles;

[0021] The arch bridge is hoisted integrally from two points of the arch bridge, the end of the arch bridge and the ground bolt embedded in the inclined bearing support are fixed by cooperation, and the concrete protection cap is poured.

[0022] The cable protection pipe and / or the communication protection pipe are installed in the arch bridge.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The cross section of the arch bridge adopts the isosceles triangle structure, without considering the personnel passing, a plurality of cable protection pipes are directly arranged, the requirement of cable laying can be met, and the vertical load and the horizontal wind load of the bridge are minimized.

[0025] The longitudinal section of the arch bridge adopts the arch section, the bearing performance of the arch longitudinal section with the height-span ratio (vector-span ratio) of 0.1-1.0 is good, and the deformation is controlled.

[0026] The upper chord truss main steel pipe, the single chord of the lower chord truss and the opposite chord of the lower chord truss of the arch bridge are all made of circular steel pipes, and the wind resistance performance is good. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is the front view of the present application;

[0029] Figure 2 It is the cross-sectional view of the present application;

[0030] Figure 3 It is the schematic diagram of installing the cable protection pipe of the present application;

[0031] Figure 4 It is the perspective view of the present application.

[0032] 1, bridge foundation cast-in-place pile; 2, bearing platform; 3, inclined bearing support; 4, bridge embedded part; 5, arch bridge; 51, upper chord truss main steel pipe; 52, single chord of lower chord truss; 53, opposite chord of lower chord truss; 54, web; 61, flat steel; 62, flat steel fastening clamp; 63, cable protection pipe; 64, communication protection pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0034] Embodiment:

[0035] As shown in Figure 1 , Figure 4 , only the laying of the cable protection pipe 63 is considered on the arched bridge 5, and the passage of the maintenance personnel is not considered.

[0036] As shown in Figure 2 , Figure 3 , the cross section of the arched bridge 5 is an isosceles triangle, and the space inside is determined by the number of the cable protection pipes 63 to be laid. Usually, the number of the cable protection pipes 63 can be 4, 8, 12, etc., and a plurality of communication protection pipes 64 with smaller specifications are considered to be arranged. The specifications of the cable protection pipes 63 are mainly to meet the cable laying. When 4 cable protection pipes 63 are laid, the cross section arrangement is shown in Figure 3 . The cable protection pipe 63 is fixed to the adjacent web member 54 through a U-shaped flat steel 61 and a flat steel fastening clamp 62. The flat steel 61 and the flat steel fastening clamp 62 use existing products and will not be described again.

[0037] As shown in Figure 1 , the arched bridge 5 is longitudinally an arched structure, and the span height ratio (arch vector ratio = H / L) is 0.1-1.0. The left and right ends of the arched bridge 5 are fixedly connected with the inclined surface of the inclined pile cap support 3, the angle between the inclined surface of the inclined pile cap support 3 and the horizontal plane is 45°, the inclined pile cap support 3 is fixed on the top of the pile cap 2, the pile cap 2 is relatively arranged on the ground, and four groups of bridge foundation cast-in-place piles 1 are arranged at the bottom of the pile cap 2 and are buried in the ground.

[0038] The inclined surface of the inclined pile cap support 3 is pre-buried with a plurality of bridge pre-buried members 4, and the end of the arched bridge 5 is welded with the plurality of bridge pre-buried members 4 to realize the fixing of the arched bridge 5 relative to the inclined pile cap support 3 and to be integrated into one body.

[0039] The arched bridge 5 includes upper chord truss main steel pipes 51, lower chord truss single-side chord bars 52 and lower chord truss opposite-side chord bars 53 which extend parallel to each other. The upper chord truss main steel pipes 51 are located directly above the lower chord truss single-side chord bars 52 and the lower chord truss opposite-side chord bars 53, so that the cross section of the arched bridge 5 forms an isosceles acute triangle shape. Figure 1 and Figure 4As shown, the upper chord truss main steel pipe 51 and the lower chord truss single-side chord 52, the lower chord truss single-side chord 52 and the lower chord truss opposite-side chord 53, and the upper chord truss main steel pipe 51 and the lower chord truss opposite-side chord 53 are welded and fixed by the web member 54 to be integrated, and the web member 54 is arranged vertically and obliquely relative to the upper chord truss main steel pipe 51, the lower chord truss single-side chord 52 and the lower chord truss opposite-side chord 53.

[0040] The pile cap 2 adopts the four-pile bridge foundation cast-in-place pile 1, which is used to bear the large horizontal thrust on both sides of the arched bridge 5, and also bears the vertical and horizontal force of the arched bridge 5 under the action of the horizontal wind load;

[0041] The upper chord truss main steel pipe 51, the lower chord truss single-side chord 52, the lower chord truss opposite-side chord 53 and the web member 54 are all circular steel pipes welded in the factory;

[0042] The installation process is as follows:

[0043] All components are pre-fabricated in the factory, welded on site, and subjected to anti-corrosion construction.

[0044] ① The components are transported to the site; the bridge foundation cast-in-place pile 1 is pre-set at the set position, the upper ends of the four bridge foundation cast-in-place piles 1 are used to cast reinforced concrete to form a pile cap 2 together, the top of the pile cap 2 is used to cast reinforced concrete to form an inclined pile cap support 3 together, and the inclined surface of the inclined pile cap support 3 is pre-buried with a bridge pre-buried part 4 (a foundation bolt);

[0045] ② After the upper chord truss main steel pipe 51, the lower chord truss single-side chord 52 and the lower chord truss opposite-side chord 53 are cold-bent to form an arc-shaped profile on site, they are welded by the vertical and oblique web member 54 to form the arched bridge 5;

[0046] ③ Two-point hoisting is adopted: two automobile hoisting devices are used to integrally hoist the arched bridge 5 from the positions of 1 / 3 of the left and right ends of the arched bridge 5;

[0047] ④ The end of the arched bridge 5 is welded and connected to the pre-buried bridge pre-buried part 4 of the inclined surface of the inclined pile cap support 3 to form an integrated whole, and then a concrete protection cap is poured;

[0048] ⑤ The cable protection pipe 63 and / or the communication protection pipe 64 are installed in the arched bridge 5;

[0049] ⑥ The cable is laid.

[0050] The present application is aimed at the area with large transverse wind load, when the high-voltage power cable needs to cross a river or a road with large span, a triangular-section arched bridge structure can be used, which has the following advantages:

[0051] (1) Through the longitudinal axis arch structure, the requirements of navigation and traffic under the bridge can be met, and the requirements of deflection control can also be met;

[0052] (2) By using the arch structure, the bending moment caused by the vertical dead load such as the self-weight of the bridge and the self-weight of the cable can be converted into axial force, the cross-sectional area of the rod is reduced, the structural self-weight of the bridge is further reduced, the steel material is saved, and the energy consumption is reduced;

[0053] (3) By using the transverse triangular cross section, when the transverse wind load is large, the stress condition of the inclined truss can be fully utilized, and the bearing requirements of the horizontal load can be met;

[0054] (4) The transverse triangular cross section can better fix the cable protection pipe 63 that needs to be fixed, and avoid problems such as unstable changes of the cable caused by deformation of the arch bridge 5 in the running stage.

[0055] (5) The arch bridge 5 does not consider pedestrian traffic, and the cross section adopts an isosceles triangular cross section, which can reasonably bear the vertical dead weight, transverse wind load and other actions, and does not need to set inclined braces in the truss support.

[0056] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their entire scope and equivalents.

Claims

1. An arched long-span cable tray with a triangular cross-section, comprising an arched cable tray (5) which is arched upward in an arc-shaped structure, a cable protection tube (63) being laid inside the arched cable tray (5) along the length trajectory direction of the arched cable tray (5), characterized in that: The cross section of the arch-shaped bridge (5) along the length trajectory direction is triangular structure, and the ratio of chord to rise of the arch-shaped bridge (5) which is upwardly arched in arc structure is 0.1-1.

0.

2. The arched long-span cable tray with triangular cross-section according to claim 1, characterized in that: The triangular cross section of the arch-shaped bridge (5) is isosceles triangle.

3. The arched long-span cable tray with triangular cross-section according to claim 1, characterized in that: The arch-shaped bridge (5) is provided with inclined bearing platform supports (3) at two ends, and the inclined bearing platform supports (3) are fixed on the top of the bearing platform (2).

4. The arched long-span cable tray with triangular cross-section according to claim 3, characterized in that: The bottom of the bearing platform (2) is provided with a plurality of bridge foundation bored piles (1) which are embedded underground.

5. The arched long-span cable tray with triangular cross-section according to claim 3, characterized in that: The inclined surface of the inclined bearing platform support (3) is pre-embedded with a bridge embedded part (4), and the end of the arch-shaped bridge (5) is fixed on the inclined surface of the inclined bearing platform support (3) through the bridge embedded part (4).

6. The arched long-span cable tray with triangular cross-section according to claim 3, characterized in that: The angle between the inclined surface of the inclined bearing platform support (3) and the horizontal plane is 45°.

7. The arched long-span cable tray with triangular cross-section according to claim 1, characterized in that: The arch-shaped bridge (5) comprises upper chord truss main steel pipes (51), lower chord truss single-side chord bars (52) and lower chord truss opposite-side chord bars (53) which are distributed in acute angle triangle, and the upper chord truss main steel pipes (51), the lower chord truss single-side chord bars (52) and the lower chord truss opposite-side chord bars (53) are fixedly connected through vertical and / or inclined web bars (54) two by two.

8. The arched long-span cable tray with triangular cross-section according to claim 7, characterized in that: The upper chord truss main steel pipes (51), the lower chord truss single-side chord bars (52) and the lower chord truss opposite-side chord bars (53) adopt circular steel pipes.

9. The arched long-span cable tray with triangular cross-section according to claim 7, characterized in that: The cable protection pipe (63) is fixedly installed on the web bar (54) through the flat steel (61) and the flat steel fastening clamp (62).

10. A method for installing an arched large-span cable bridge with a triangular cross-section, comprising the arched large-span cable bridge with a triangular cross-section according to any one of claims 7-9, characterized in that, The method comprises the following steps: The main pipe members are cold-bent on site to form the upper chord truss main steel pipes (51), the lower chord truss single-side chord bars (52) and the lower chord truss opposite-side chord bars (53); The upper chord truss main steel pipes (51), the lower chord truss single-side chord bars (52) and the lower chord truss opposite-side chord bars (53) are welded two by two through the web bars (54) to form the arch-shaped bridge (5); The bridge foundation bored piles (1) are embedded underground, and the bearing platform (2) and the inclined bearing platform support (3) are sequentially installed on the upper end of the bridge foundation bored piles (1); The arch-shaped bridge (5) is integrally lifted from 1 / 3 of the arch-shaped bridge (5) by the two-point method, the end of the arch-shaped bridge (5) is fixed in cooperation with the anchor bolt which is pre-embedded in the inclined bearing platform support (3), and the concrete protection cap is poured; The cable protection pipe (63) is installed in the arch-shaped bridge (5).

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