Suspension bridge widening structure with four vertical main cables

Abstract

The invention discloses a suspension bridge widening structure with four vertical main cables, which can widen a bridge deck system of an existing suspension bridge according to needs, so that widening of the suspension bridge in engineering significance is realized. Widening is directly carried out on the two sides of the suspension bridge stiffening beam, connection with wiring is smooth, and meanwhile the occupied area is small; according to the technical scheme, an existing suspension bridge stiffening beam, a widening stiffening beam and a bridge tower are included; the widening stiffening beams are arranged on the two sides of the existing suspension bridge stiffening beam and extend in the longitudinal direction of the existing suspension bridge stiffening beam. The existing suspension bridge stiffening beams and the widening stiffening beams are connected with the bottoms of the bridge towers, and the existing suspension bridge stiffening beams and the widening stiffening beams are connected with the tops of the bridge towers through connecting assemblies; bridge deck slabs are arranged on the existing suspension bridge stiffening beams and the widening stiffening beams.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering bridges, and in particular relates to a vertical four-main-cable suspension bridge widening structure. 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 the 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 the 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 cable 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 unchanged, the bridge deck layout is adjusted, and the 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 between the route and the widening of the existing road on both sides has a large impact range, the smoothness of the project route is general, and the investment is large. Summary of the invention

[0004] In view of the above problems, the present invention provides a vertical four-main-cable suspension bridge widening structure, which greatly improves the bearing capacity of the suspension bridge by adding two main cables vertically, and can widen the bridge deck system of the existing suspension bridge as needed, thereby realizing the widening of the suspension bridge with engineering significance; the widening is directly carried out on both sides of the stiffening beam of the suspension bridge, which is smoothly connected with the wiring, occupies less space, is highly economical, and has higher corresponding route indicators and good driving comfort.

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

[0006] The present invention provides a vertical four-main-cable suspension bridge widening structure, comprising:

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

[0008] The widened stiffening beam is arranged on both sides of the existing stiffening beam of the suspension bridge and extends along the longitudinal direction of the existing stiffening beam of the suspension bridge;

[0009] The existing suspension bridge stiffening beam and the spliced ​​widened stiffening beam are both connected to the bottom of the bridge tower, and the existing suspension bridge stiffening beam and the spliced ​​widened stiffening beam are both connected to the top of the bridge tower through a connecting assembly;

[0010] The existing suspension bridge stiffening beams and the spliced ​​widened stiffening beams are both provided with bridge decks.

[0011] 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.

[0012] Furthermore, the connection assembly includes an existing main cable and a newly added main cable, the newly added main cable is arranged 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] Furthermore, a new sling is provided on the new main cable, and an existing sling is provided on the existing main cable; the new sling is in an inverted U shape.

[0017] Furthermore, 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 one anchoring point; the anchoring point of the newly added sling is the same as the anchoring point of the existing sling on the existing suspension bridge stiffening beam in the longitudinal direction, 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.

[0018] 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.

[0019] Furthermore, the existing suspension bridge stiffening beam adopts a box beam, a truss beam or a plate beam; the widened stiffening beam is connected to the existing suspension bridge stiffening beam by welding or bolts, and the widened stiffening beam and the existing suspension bridge stiffening beam are separated by newly added cables, existing cables and guardrails.

[0020] Compared with the prior art, the present invention has the following advantages and positive effects:

[0021] The present invention greatly improves the bearing capacity of the suspension bridge by adding two main cables vertically, and can widen the bridge deck system of the existing suspension bridge as needed, thereby realizing the widening of the suspension bridge in an engineering sense, and solving the problem that the main cables of the load-bearing structure of the suspension bridge cannot be increased in cross-section, resulting in a small width of the bridge deck system and difficulty in realizing direct widening in an engineering sense; it replaces the expansion plan of the traditional technology of maintaining the weight of the bridge deck system unchanged, adjusting the bridge deck layout, and adding a lane or a sidewalk; the mid-span of the newly added main cable is located a certain distance above the existing main cable, thereby ensuring maintenance space during operation and installation space during widening construction; four sets of suspension cables are arranged on the same cross-section of the stiffening beam after the widening is completed, and are suspended and supported on the newly added main cable and the existing main cable at the same time, thereby 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.

[0022] The present invention directly widens the two sides of the stiffening beam of the suspension bridge, which is smoothly connected with the wiring. Compared with the expansion method of a new bridge, it reduces the occupied area and is highly economical. At the same time, the corresponding route index is relatively high and the driving comfort is good. The widening of the suspension bridge with engineering significance is achieved. A specific plan and structure are provided for realizing the widening of the highway suspension bridge, and a feasible engineering plan is provided for the expansion of the suspension bridge in the highway reconstruction and expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic elevation view of the widened structure of a suspension bridge with four vertical main cables according to the present invention;

[0025] 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;

[0026] Figure 3 It is a partial three-dimensional structural schematic diagram of the widened structure of the four-main-cable suspension bridge of the present invention;

[0027] Figure 4 It is a schematic cross-sectional view of the stiffening beams and slings of the widened structure of the suspension bridge with four main cables of the present invention.

[0028] 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. Widened 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. DETAILED DESCRIPTION

[0029] 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.

[0030] 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;

[0031] At present, the cross-section of the main cable of the load-bearing structure of suspension bridges cannot be increased, so the width of the bridge deck system is relatively small, and it is impossible to directly widen the suspension bridge in an engineering sense. The current method is to build a new suspension bridge next to the existing bridge, which leads to a large area and investment, and it is more difficult to connect with the widened part of the bridge.

[0032] In order to solve the above technical problems, the present application proposes a vertical four-main-cable suspension bridge widening structure, such as Figure 1-Figure 4 As shown, it includes: an existing suspension bridge stiffening beam 6, a widened stiffening beam 7 and a bridge tower 5; the widened stiffening beam 7 is arranged on both sides of the existing suspension bridge stiffening beam 6 and extends along the longitudinal direction of the existing suspension bridge stiffening beam 6; the existing suspension bridge stiffening beam 6 and the widened stiffening beam 7 are both connected to the bottom of the bridge tower 5, and the existing suspension bridge stiffening beam 6 and the widened 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 widened stiffening beam 7 are both provided with a bridge deck.

[0033] Specifically, widened stiffening beams 7 are directly added on both sides of the existing suspension bridge stiffening beams 6 to achieve the purpose of increasing the traffic lanes. The newly added stiffening beams are supported by two newly added main cables 1 located directly above the existing main cables 2.

[0034] A main cable saddle is arranged 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 arranged on the upper end of the bridge tower 5, and the existing main cable saddle 9 is provided with a tower top saddle cover, and the newly added main cable saddle 8 is arranged above the tower top saddle cover.

[0035] The connection assembly includes an existing main cable 2 and a newly added main cable 1, wherein the newly added main cable 1 is arranged at a set height 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. Two newly added main cables are vertically added to form a four-main-cable suspension bridge widening structure, which can directly widen the existing suspension bridge according to needs, is convenient for bridgehead connection, has good driving comfort, occupies less space, and has good investment economy.

[0036] The mid-span of the newly added main cable 1 is located more than 5.0m above the existing main cable 2, ensuring maintenance space during operation and installation space during widening construction; the top of the tower of the newly added main cable 1 is in the same horizontal position as the existing main cable 2 and is stacked vertically.

[0037] 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.

[0038] 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 outside the existing anchors 12 and away from one end of the bridge tower 5. The back span side of the newly added main cable 1 is laterally located outside the existing main cable 2, and the corresponding anchoring system and anchor are separated from the anchor of the existing main cable 2 and arranged front and back; the position of the newly added main cable 1 gradually changes from the tower top to the anchor.

[0039] The existing anchorage 12 and the newly added anchorage 14 are both provided with anchors, both ends of the newly added main cable 1 are connected to the newly added anchorage 13 on the newly added anchorage 14, and both ends of the existing main cable 2 are connected to the existing anchorage 11 on the existing anchorage 12. The newly added anchorages 13 of the two newly added main cables 1 are anchored to the anchorages near the anchorages of the two existing main cables 2 to form a four-main cable system.

[0040] 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 newly added sling 3 is in an inverted U shape.

[0041] 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.

[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; the widened stiffening beam 7 is connected to the existing suspension bridge stiffening beam 6 by welding or bolts, and the widened stiffening beam 7 is separated from the existing suspension bridge stiffening beam 6 by the newly added sling 3, the existing sling 4 and the guardrail.

[0044] Specifically, the existing stiffening beam can be widened by using a box beam, a truss beam or a plate beam. Four sets of slings are arranged on the same cross section of the stiffening beam after widening, and are simultaneously suspended and supported on the newly added main cable 1 and the existing main cable 2. The newly added main cable 1 has the same sling position as the existing main cable 2, and the cable force of the existing sling 4 is controlled to be less than or equal to the cable force before widening.

[0045] 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 vertical four-main-cable suspension bridge widening structure, characterized in that: include: There are existing suspension bridge stiffening beams, widened stiffening beams and bridge towers; The widened stiffening beam is arranged on both sides of the existing stiffening beam of the suspension bridge and extends along the longitudinal direction of the existing stiffening beam of the suspension bridge; The existing suspension bridge stiffening beam and the spliced ​​widened stiffening beam are both connected to the bottom of the bridge tower, and the existing suspension bridge stiffening beam and the spliced ​​widened stiffening beam are both connected to the top of the bridge tower through a connecting assembly; The existing suspension bridge stiffening beams and the spliced ​​widened stiffening beams are both provided with bridge decks.

2. A vertical four-main-cable suspension bridge widening structure 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.

3. A vertical four-main-cable suspension bridge widening structure as claimed in claim 2, 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.

4. A vertical four-main-cable suspension bridge widening structure as claimed in claim 2, 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.

5. A vertical four-main-cable suspension bridge widening structure as claimed in claim 3, 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.

6. A vertical four-main-cable suspension bridge widening structure as claimed in claim 5, 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.

7. A vertical four-main-cable suspension bridge widening structure as claimed in claim 5, characterized in that: The newly added main cable is provided with a newly added sling, and the existing main cable is provided with an existing sling; the newly added sling is in an inverted U shape.

8. A vertical four-main-cable suspension bridge widening structure as claimed in claim 7, characterized in that: The open end of the newly added sling is anchored to the existing suspension bridge stiffening beam to form two anchor points; the existing sling is anchored to the existing suspension bridge stiffening beam to form one anchor point; the anchor point of the newly added sling is at the same longitudinal position as the anchor point of the existing sling on the existing suspension bridge stiffening beam, and the lateral position of the anchor point of the newly added sling is located on both sides of the anchor point of the existing sling.

9. A vertical four-main-cable suspension bridge widening structure 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. A vertical four-main-cable suspension bridge widening structure as claimed in claim 8, characterized in that: The existing suspension bridge stiffening beam adopts box beam, truss beam or plate beam; the widened stiffening beam is connected to the existing suspension bridge stiffening beam by welding or bolts, and the widened stiffening beam and the existing suspension bridge stiffening beam are separated by newly added slings, existing slings and guardrails.

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