Four-main-cable suspension bridge extension structure for transforming single-layer traffic into double-layer traffic

Abstract

The invention discloses a four-main-cable suspension bridge extension structure for transforming a single-layer suspension bridge into double-layer traffic, which realizes structure extension for transforming the single-layer suspension bridge into the double-layer traffic, fully utilizes the abundant bearing capacity of the existing suspension bridge body structure while increasing the number of lanes, and reduces the investment scale. According to the technical scheme, an existing suspension bridge stiffening beam, a lower layer stiffening beam and a bridge tower are included; the lower-layer stiffening beam is arranged on the lower portion of the existing suspension bridge stiffening beam, and the existing suspension bridge stiffening beam and the lower-layer stiffening beam are arranged in parallel to form a double-layer truss structure; straight web members and diagonal web members are arranged between the existing suspension bridge stiffening beam and the lower-layer stiffening beam and arranged on the two sides of the lower-layer stiffening beam. The connecting piece is used for connecting the existing suspension bridge stiffening beam and the lower stiffening beam; the existing suspension bridge stiffening beam and the lower-layer stiffening beam are both connected with the bottom of the bridge tower, and the existing suspension bridge stiffening beam and the lower-layer stiffening beam are both connected with the top of the bridge tower through connecting assemblies.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering bridges, and in particular relates to an expansion structure of a four-main-cable suspension bridge for transforming a single-deck into a double-deck traffic bridge. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the traffic volume of highways built in the early period is becoming increasingly saturated, and there is an urgent need to improve traffic capacity, improve quality and efficiency, and save resources through reconstruction and expansion. Among them, bridges are the key and difficult points in reconstruction and expansion, especially super-large bridges such as suspension bridges. Widening existing suspension bridges to increase the number of lanes can make full use of the existing suspension bridge structure and effectively save land, which is the most economical and environmentally friendly reconstruction and expansion method. However, the corresponding load-bearing cable is limited by the supporting saddles, cable clamps, and cable anchoring systems, and the cross-section cannot be increased. Usually, in order to maintain the weight of the bridge deck system unchanged, the bridge deck layout is adjusted, and lanes or sidewalks are added, which cannot achieve real expansion. In engineering practice, suspension bridges that need to be expanded are mostly realized by building a new suspension bridge next to the existing suspension bridge, but the connection of routes and interchanges has a large impact range, the smoothness of the engineering route is poor, and the investment is large. Summary of the invention

[0004] In view of the above problems, the present invention provides a four-main-cable suspension bridge expansion structure for converting a single-deck into a double-deck traffic, which realizes the structural expansion of converting a single-deck suspension bridge into a double-deck traffic. While increasing the number of lanes, it fully utilizes the abundant bearing capacity of the existing suspension bridge body structure, improves material utilization and reduces investment scale.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a four-main-cable suspension bridge expansion structure for transforming a single-deck into a double-deck traffic structure, comprising:

[0007] There are existing suspension bridge stiffening beams, lower stiffening beams and bridge towers;

[0008] The lower layer stiffening beam is arranged at the lower part of the existing suspension bridge stiffening beam, and the existing suspension bridge stiffening beam is arranged in parallel with the lower layer stiffening beam to form a double-layer truss structure;

[0009] A straight web member and an oblique web member are provided between the existing suspension bridge stiffening beam and the lower stiffening beam, and are arranged on both sides of the lower stiffening beam; and are used to connect the existing suspension bridge stiffening beam and the lower stiffening beam;

[0010] The existing suspension bridge stiffening beam and the lower stiffening beam are both connected to the bottom of the bridge tower, and the existing suspension bridge stiffening beam and the lower stiffening beam are both connected to the top of the bridge tower through a connecting component;

[0011] The existing suspension bridge stiffening beam and the lower stiffening beam are both provided with bridge decks.

[0012] Furthermore, an upper chord is provided at the lower part of the existing suspension bridge stiffening beam, and a lower chord is provided at the lower stiffening beam; one end of the straight web member is connected to the upper chord, and the other end is connected to the lower chord; one end of the diagonal web member is connected to the upper chord, and the other end is connected to the lower chord; the straight web member and the diagonal web member are arranged at intervals along the axial direction of the existing suspension bridge stiffening beam.

[0013] Furthermore, a main cable saddle is provided on the top of the bridge tower, and the main cable saddle includes an existing main cable saddle and a newly added main cable saddle; the existing main cable saddle is fixedly arranged at the upper end of the bridge tower, the existing main cable saddle is provided with a tower top saddle cover, and the newly added main cable saddle is arranged above the tower top saddle cover.

[0014] Furthermore, the connection assembly includes an existing main cable and a newly added main cable, the newly added main cable is arranged at a height set distance above the existing main cable; the existing main cable is installed on the existing main cable saddle, and the newly added main cable is installed on the newly added main cable saddle.

[0015] Furthermore, two tower bridges are provided, which are respectively arranged at the two ends of the middle span of the stiffening beam of the existing suspension bridge; and two main cable saddles are provided on each of the bridge towers, which are respectively arranged at the two ends of the top of the bridge tower.

[0016] Furthermore, anchors are respectively arranged on both sides of the side span of the stiffening beam of the existing suspension bridge; the anchors are divided into existing anchors and newly added anchors; the newly added anchors are arranged outside the existing anchors and away from one end of the bridge tower.

[0017] Furthermore, the existing anchorage and the newly added anchorage are both provided with anchors, both ends of the newly added main cable are connected to the newly added anchorage on the newly added anchorage, and both ends of the existing main cable are connected to the existing anchorage on the existing anchorage.

[0018] Furthermore, the newly added main cable is provided with a new sling, and the existing main cable is provided with an existing sling; the open end of the newly added sling is anchored to the existing suspension bridge stiffening beam to form two anchoring points; the existing sling is anchored to the existing suspension bridge stiffening beam to form an anchoring point; the anchoring point of the newly added sling is the same as the anchoring point of the existing sling in the longitudinal position on the existing suspension bridge stiffening beam, and the lateral position of the anchoring point of the newly added sling is located on both sides of the anchoring point of the existing sling.

[0019] Furthermore, the newly added main cable is connected to the newly added sling via a straddle-type sling clamp, and the existing main cable is also connected to the existing sling via an existing sling clamp.

[0020] Furthermore, the existing suspension bridge stiffening beam adopts a box beam, a truss beam or a plate beam.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] The present invention transforms a single-layer stiffening beam into a double-layer truss beam, and the corresponding load-bearing structure is two main cables added vertically, which greatly improves the traffic capacity and bearing capacity of the suspension bridge, and realizes the expansion of the suspension bridge in an engineering sense; it solves the problem that the suspension bridge is difficult to achieve direct expansion in an engineering sense because the main cable of the load-bearing structure cannot be increased in cross-section; four groups of suspension cables are arranged on the same cross-section of the stiffening beam after the double-layer truss beam is transformed, and are suspended and supported on the newly added main cables and the existing main cables at the same time, reducing the load that the existing suspension cables need to bear, and by adding two main cables vertically, the bearing capacity of the suspension bridge is greatly improved.

[0023] The present invention directly arranges the lower stiffening beam under the stiffening beam of the suspension bridge, which reduces the occupied area and has high economy compared with the expansion method of a new bridge. At the same time, the corresponding route index is relatively high. It provides a specific plan and structure for increasing the number and width of roads in highway suspension bridges, and provides a feasible engineering plan for the expansion of suspension bridges in highway reconstruction and expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 It is a schematic elevation diagram of the expanded structure of the four-main-cable suspension bridge of the present invention;

[0026] Figure 2 This is a schematic diagram of the arrangement of the cable saddles on the top of the bridge tower of the present invention;

[0027] Figure 3 It is a partial three-dimensional structural schematic diagram of the expansion structure of the suspension bridge with four main cables of the present invention;

[0028] Figure 4 It is a schematic cross-sectional view of the stiffening beams and slings of the expansion structure of the four-main-cable suspension bridge of the present invention.

[0029] In the figure: 1. New main cable; 2. Existing main cable; 3. New sling; 4. Existing sling; 5. Bridge tower; 6. Existing suspension bridge stiffening beam; 7. Lower stiffening beam; 8. New main cable saddle; 9. Existing main cable saddle; 10. Straddle-type sling clamp; 11. Existing anchor; 12. Existing anchor; 13. New anchor; 14. New anchor; 15. Existing sling clamp; 16. Upper chord; 17. Lower chord; 18. Straight web; 19. Diagonal web. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0032] At present, the main cable of the load-bearing structure of suspension bridges cannot have its cross-section increased, resulting in the expansion of suspension bridges mostly adopting the method of building a new suspension bridge next to the existing bridge, which takes up more land and requires large investment.

[0033] In order to solve the above technical problems, the present application proposes a four-main-cable suspension bridge expansion structure for single-deck transformation of double-deck traffic, such as Figure 1-Figure 4 As shown, it includes: an existing suspension bridge stiffening beam 6, a lower stiffening beam 7 and a bridge tower 5; the lower stiffening beam 7 is arranged at the lower part of the existing suspension bridge stiffening beam 6, and the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7 are arranged in parallel to form a double-layer truss structure; a straight web member 18 and an oblique web member 19 are arranged between the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7, and are arranged on both sides of the lower stiffening beam 7; used to connect the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7; the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7 are both connected to the bottom of the bridge tower 5, and the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7 are both connected to the top of the bridge tower 5 through a connecting component; the existing suspension bridge stiffening beam 6 and the lower stiffening beam 7 are both provided with a bridge deck.

[0034] Specifically, the present invention transforms a single-layer into a double-layer traffic four-main-cable suspension bridge expansion structure, adds a web member and a lower chord member at the lower part of the existing suspension bridge stiffening beam 6 to form a double-layer truss beam, and the weight of the newly added stiffening beam and the traffic operation load are borne by two newly added main cables 1 located in the middle span just above the existing main cables 2; the existing suspension bridge body structure is fully utilized, which is simple and compact, effectively saves land, improves material utilization, has good investment economy, and is conducive to energy conservation and emission reduction.

[0035] An upper chord 16 is provided at the lower part of the existing suspension bridge stiffening beam 6, and a lower chord 17 is provided at the lower stiffening beam 7. One end of the straight web member 18 is connected to the upper chord 16, and the other end is connected to the lower chord 17; one end of the diagonal web member 19 is connected to the upper chord 16, and the other end is connected to the lower chord 17; the straight web member 18 and the diagonal web member 19 are arranged at intervals along the axial direction of the existing suspension bridge stiffening beam 6.

[0036] Furthermore, a main cable saddle is provided on the top of the bridge tower 5, and the main cable saddle includes an existing main cable saddle 9 and a newly added main cable saddle 8; the existing main cable saddle 9 is fixedly provided on the upper end of the bridge tower 5, the existing main cable saddle 9 is provided with a tower top saddle cover, and the newly added main cable saddle 8 is provided above the tower top saddle cover. The bridge tower 5 is the main pressure-bearing structure, which has a large bearing capacity and can be modified according to the force requirements; or the steel plate can be externally covered to improve the compressive bearing capacity of the concrete bridge tower 5, and the pile foundation can be added to improve the basic bearing capacity of the bridge tower 5.

[0037] Furthermore, the connecting assembly includes an existing main cable 2 and a newly added main cable 1, and the newly added main cable 1 is arranged at a height of a set distance above the existing main cable 2; the existing main cable 2 is installed on the existing main cable saddle 9, and the newly added main cable 1 is installed on the newly added main cable saddle 8.

[0038] There are two tower bridges, which are arranged at two ends of the middle span of the existing suspension bridge stiffening beam 6; each of the bridge towers 5 is provided with two main cable saddles, which are arranged at two ends of the top of the bridge tower 5.

[0039] Anchors are respectively arranged on both sides of the side span of the existing suspension bridge stiffening beam 6; the anchors are divided into existing anchors 12 and newly added anchors 14; the newly added anchors 14 are arranged on the outside of the existing anchors 12 and away from one end of the bridge tower 5. Specifically, maintaining a certain distance between the newly added anchors 14 and the existing anchors 12 can reduce the impact of the excavation of the foundation pit of the newly added anchors 14 on the existing anchors 12.

[0040] The existing anchor 12 and the newly added anchor 14 are both provided with anchors, both ends of the newly added main cable 1 are connected to the newly added anchors 13 on the newly added anchor 14 , and both ends of the existing main cable 2 are connected to the existing anchors 11 on the existing anchor 12 .

[0041] The newly added main cable 1 is provided with a newly added sling 3, and the existing main cable 2 is provided with an existing sling 4; the open end of the newly added sling 3 is anchored to the existing suspension bridge stiffening beam 6 to form two anchoring points; the existing sling 4 is anchored to the existing suspension bridge stiffening beam 6 to form one anchoring point; the anchoring point of the newly added sling 3 and the anchoring point of the existing sling 4 are at the same longitudinal position on the existing suspension bridge stiffening beam 6, and the lateral position of the anchoring point of the newly added sling 3 is located on both sides of the anchoring point of the existing sling 4. The present invention adds a straight web member 18, an inclined web member 19, an upper chord member 16 and a lower chord member 17 to the lower part of the existing suspension bridge stiffening beam 6 to form a double-layer truss beam, and the dead load and operational live load of the lower stiffening beam 7 are transferred to the newly added main cable 1 by the newly added sling 3, and the load is transferred to the bridge tower 5 by the newly added main cable 1, so as to make full use of the abundant bearing capacity of the bridge tower 5 and increase the number of lanes of the suspension bridge.

[0042] The newly added main cable 1 is connected to the newly added sling 3 via a straddle-type sling clamp 10 , and the existing main cable 2 is also connected to the existing sling 4 via an existing sling clamp 15 .

[0043] The existing suspension bridge stiffening beam 6 is a box beam, a truss beam or a plate beam.

[0044] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A four-main-cable suspension bridge expansion structure for single-deck transformation to double-deck traffic, characterized in that: include: There are existing suspension bridge stiffening beams, lower stiffening beams and bridge towers; The lower layer stiffening beam is arranged at the lower part of the existing suspension bridge stiffening beam, and the existing suspension bridge stiffening beam is arranged in parallel with the lower layer stiffening beam to form a double-layer truss structure; A straight web member and an oblique web member are provided between the existing suspension bridge stiffening beam and the lower stiffening beam, and are arranged on both sides of the lower stiffening beam; and are used to connect the existing suspension bridge stiffening beam and the lower stiffening beam; The existing suspension bridge stiffening beam and the lower stiffening beam are both connected to the bottom of the bridge tower, and the existing suspension bridge stiffening beam and the lower stiffening beam are both connected to the top of the bridge tower through a connecting component; The existing suspension bridge stiffening beam and the lower stiffening beam are both provided with bridge decks.

2. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 1, characterized in that: An upper chord is arranged at the lower part of the existing suspension bridge stiffening beam, and a lower chord is arranged at the lower stiffening beam. One end of the straight web member is connected to the upper chord, and the other end is connected to the lower chord; one end of the diagonal web member is connected to the upper chord, and the other end is connected to the lower chord; the straight web member and the diagonal web member are arranged at intervals along the axial direction of the existing suspension bridge stiffening beam.

3. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 1, characterized in that: A main cable saddle is arranged on the top of the bridge tower, and the main cable saddle includes an existing main cable saddle and a newly added main cable saddle; the existing main cable saddle is fixedly arranged on the upper end of the bridge tower, the existing main cable saddle is provided with a tower top saddle cover, and the newly added main cable saddle is arranged above the tower top saddle cover.

4. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 3, characterized in that: The connection assembly includes an existing main cable and a newly added main cable, wherein the newly added main cable is arranged at a height of a set distance above the existing main cable; The existing main cable is installed on the existing main cable saddle, and the newly added main cable is installed on the newly added main cable saddle.

5. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 3, characterized in that: There are two tower bridges, which are respectively arranged at the two ends of the middle span of the stiffening beam of the existing suspension bridge; each of the bridge towers is provided with two main cable saddles, which are respectively arranged at the two ends of the top of the bridge tower.

6. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 4, characterized in that: Anchors are respectively arranged on both sides of the side span of the existing suspension bridge stiffening beam; the anchors are divided into existing anchors and newly added anchors; the newly added anchors are arranged outside the existing anchors and away from one end of the bridge tower.

7. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 6, characterized in that: The existing anchor and the newly added anchor are both provided with anchors, both ends of the newly added main cable are connected to the newly added anchors on the newly added anchor, and both ends of the existing main cable are connected to the existing anchors on the existing anchor.

8. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 7, characterized in that: The newly added main cable is provided with a new sling, and the existing main cable is provided with an existing sling; the open end of the newly added sling is anchored to the existing suspension bridge stiffening beam to form two anchoring points; the existing sling is anchored to the existing suspension bridge stiffening beam to form an anchoring point; the anchoring point of the newly added sling is the same as the anchoring point of the existing sling in the same longitudinal position on the existing suspension bridge stiffening beam, and the lateral position of the anchoring point of the newly added sling is located on both sides of the anchoring point of the existing sling.

9. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 8, characterized in that: The newly added main cable is connected to the newly added sling via a straddle-type sling clamp, and the existing main cable is also connected to the existing sling via an existing sling clamp.

10. The expansion structure of a four-main-cable suspension bridge for converting a single-deck into a double-deck traffic as claimed in claim 8, characterized in that: The existing suspension bridge stiffening beam adopts a box beam, a truss beam or a plate beam.

Images