Construction method of four-main-cable suspension bridge with global distributed energy consumption

Abstract

The invention discloses a construction method of a four-main-cable suspension bridge with global distributed energy consumption, which comprises a new construction method and a reconstruction construction method, and specifically comprises a construction anchorage foundation, a low cable splay cable anchoring structure and a high cable splay cable anchoring structure; constructing a main tower foundation, a main tower bearing platform and a main tower; mounting a low cable saddle and a high cable saddle; mounting a low cable catwalk and a high cable catwalk; installing a low cable and a high cable; mounting an inter-cable inhaul cable to connect the low cable and the high cable; mounting a suspension cable on the low cable, and mounting a stiffening beam; the load bearing proportion and the line shape of the low cable and the high cable are regulated and controlled through the inter-cable inhaul cable; and construction of the bridge structure is completed. The method is simple and clear, the new construction and reconstruction construction requirements of the four-main-cable suspension bridge with the global distributed energy consumption function are met, and the construction method matched with the novel bridge structure system is provided.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering bridges, and in particular to a construction method of a four-main-cable suspension bridge with global distributed energy dissipation. Background Art

[0002] A bridge is a structure used in the construction of highways, railways, urban roads and water conservancy infrastructure to cross various obstacles (such as rivers or other structures). According to the structural stress characteristics, a suspension bridge is a bridge that uses cables or chains that bear tension as the main load-bearing components. It is composed of suspension cables, pylons, anchors, hangers, bridge deck systems, etc. The main load-bearing component of a suspension bridge is the cable, which mainly bears tension and is generally made of steel with high tensile strength (steel wire, steel cable, etc.). Since a suspension bridge can make full use of the tensile strength of the material, it has the characteristics of saving materials and light weight, so it has the largest spanning capacity among various system bridges, and the span can reach 2,300 to 2,500 meters.

[0003] Although the span of suspension bridges has increased dramatically, in general, the current traditional suspension bridges have the following shortcomings: (1) The current maximum span is 2300 meters to 2500 meters, and the span needs to be further increased; (2) When the span is large or the load is heavy, the main cable diameter is too large, which leads to problems such as greater difficulty in cable installation, longer construction period, reduced cable clamp tightening efficiency, and heavy cable saddle lifting weight; (3) The bridge has large lateral deformation, and adverse climate and load conditions affect driving comfort and safety; (4) Wind-induced flutter and vortex vibration are prone to occur, and the wind resistance performance is poor; (6) The main cable cannot be replaced and lacks maintainability, which affects the life of the bridge.

[0004] The four-main-cable suspension bridge with global distributed energy dissipation function solves the problems of large cable strand installation difficulty, long construction period, reduced cable clamp tightening efficiency, heavy cable saddle hoisting weight, and poor main cable maintainability of super-long span suspension bridges. The four main cables are arranged in two different vertical arrangements. The low cable and the high cable are connected by cable-stayed cables, which realizes the coordinated force of the low cable and the high cable. The load-bearing ratio and line shape of the low cable and the high cable can be adjusted, and the global distributed energy dissipation function of the main cable can be realized. The vibration reduction and energy dissipation capacity of wind, vehicle, and bridge vibration is improved, thereby improving the wind stability and wind-induced vibration resistance of the bridge structure. It is suitable for the construction of suspension bridges with a main span of 2500 to 5000 meters and the improvement and transformation of the main cable bearing performance of existing suspension bridges. However, as a new large-span four-main-cable suspension bridge structure system, there is a lack of corresponding construction methods. The development of a matching, simple, and easy-to-implement construction method has important application value and engineering significance for the development of bridges in super-long span suspension bridges and suspension bridge performance improvement technologies. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a construction method for a four-main-cable suspension bridge with globally distributed energy dissipation, which can successfully realize the construction of an advanced bridge type such as a four-main-cable suspension bridge with globally distributed energy dissipation function, which has a more reasonable structure and performance design, greater lateral stiffness, stronger wind and earthquake resistance and vibration reduction and energy dissipation capabilities, and extremely high theoretical spanning capacity, filling the gap in existing construction technology and having good application value.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a construction method of a four-main-cable suspension bridge with global distributed energy consumption, including a new construction method, wherein the new construction method includes the following steps:

[0008] Step 1: construct anchor foundations, low cable anchor structures and high cable anchor structures on the ground at both ends of the suspension bridge;

[0009] Step 2: construct the main tower foundation on the ground where the main tower of the suspension bridge is installed, and construct the main tower cap and the main tower on the foundation;

[0010] Step 3: Install low cable saddle and high cable saddle on the top of the main tower;

[0011] Step 4: Install the low cable catwalk and high cable catwalk between the anchor and the top surface of the main tower; before this, complete the production of the low cable strand, high cable strand, cable clamp, and cable stay;

[0012] Step 5: Install low cable strands on the low cable catwalk and high cable strands on the high cable catwalk, and complete cable tightening, wire winding, and cable clamp installation to form low cables and high cables in the empty cable state; the line shape of the low cables and high cables in the empty cable state should meet the line shape control requirements;

[0013] Step 6: Starting from the saddle at the top of the tower, install the cable stays in sequence towards the middle of the main span and the anchorage of the side span;

[0014] Step 7: Perform linear measurement and linear control analysis of the low cable and high cable again, calculate and adjust the length of the stiffening beam suspension cable, and install the stiffening beam suspension cable at the inner cable clamp;

[0015] Step 8: Install stiffening beams, construct road pavement, anti-collision guardrails, and lighting facilities;

[0016] Step 9: According to the load distribution ratio and linear control requirements of the low cable and the high cable, the length of the cable stays is adjusted again to complete the construction of the bridge structure.

[0017] Preferably, it also includes a reconstruction construction method, which includes the following steps:

[0018] Step 1: construct a high cable anchoring structure and its foundation at a certain distance from the far end of the anchorage of the existing suspension bridge;

[0019] Step 2: reinforce the main tower foundation and main tower of the existing suspension bridge as needed, increase the main tower top space as needed to install the high cable saddle, and reinforce the tower top structure where the high cable saddle is installed and add a saddle force transmission structure;

[0020] Step 3: Install the high cable saddle on the top of the main tower;

[0021] Step 4: Install the high cable catwalk between the high cable anchoring structure and the top surface of the main tower; before this, complete the production of high cable strands, cable clamps, and cable stays;

[0022] Step 5: Install high cable strands on the high cable catwalk, and complete the cable tightening, wire winding, and cable clamp installation; form a high cable in an empty cable state; the line shape of the high cable in the empty cable state should meet the line shape control requirements;

[0023] Step 6: Starting from the saddle at the top of the tower, install the cable stays in sequence towards the middle of the main span and the anchorage of the side span;

[0024] Step 7: Remove and replace the stiffening beams and stiffening beam suspension cables in sections from the mid-span and anchorage towards the main tower;

[0025] Step 8: Complete the construction of road pavement, anti-collision guardrails and lighting facilities;

[0026] Step 9: According to the load distribution ratio and linear control requirements of the low cable and the high cable, the length of the cable stays is adjusted again to complete the construction of the bridge structure.

[0027] Preferably, if the bridge structure is a multi-span structural system, the main spans should be installed synchronously; if synchronous installation cannot be achieved, the segment difference must be strictly controlled according to the ability of the middle main tower 10 and the saddle of the suspension bridge to withstand unbalanced forces and the friction force of the low cable and the high cable in the saddle to resist sliding;

[0028] The tension of the cable-stayed cable varies greatly during construction and bridge operation. The cable body, tensioning device and elastic damping device must meet both the safety calculation requirements during construction and the fatigue calculation requirements during operation.

[0029] Preferably, in step 6 of the new construction method, due to the different vertical span ratios, the distance between the low cable and the high cable when the cables are empty is greater than the distance between the low cable and the high cable when the bridge is completed, and a temporary cable is used to pull the low cable and the high cable at the location to be installed during the installation process;

[0030] Preferably, in step 6 of the reconstruction construction method, due to the different vertical-span ratios and the existing low cable already connected to the stiffening beam, the distance between the high cable and the existing low cable when the cable is empty is greater than the distance of the completed bridge, and temporary cables are used to pull the low cable and the high cable at the location to be installed during the installation process.

[0031] The beneficial effects of the present invention are:

[0032] (1) The construction method of the present invention can successfully realize the construction of a four-main-cable suspension bridge with global distributed energy dissipation function, which is an advanced bridge type with more reasonable structure and performance design, greater lateral stiffness, stronger wind and earthquake resistance and vibration reduction and energy dissipation capabilities, and extremely large theoretical spanning capacity, filling the gap in existing construction technology and having good application value;

[0033] (2) The construction method of the present invention can be used to reinforce or transform an existing suspension bridge to make it a four-main-cable suspension bridge structure system with global distributed energy dissipation function, which has good technical and economic benefits;

[0034] (3) The construction method of the present invention is simple and clear, and the synchronous construction method is mostly adopted, which can greatly shorten the construction period and save construction costs;

[0035] (4) The construction method of the present invention has high requirements on the linear monitoring and control during the construction process and the technical level of the construction personnel, which is conducive to improving my country's advanced construction technology and equipment and cultivating high-level construction technicians. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the construction of anchorage and bridge towers;

[0038] Figure 2 This is a schematic diagram of low cable and high cable installation;

[0039] Figure 3 This is a schematic diagram of the installation of cable tensioning between the low cable and the high cable;

[0040] Figure 4 This is a schematic diagram of the installation of the slings for the stiffening beam;

[0041] Figure 5 This is a schematic diagram of the installation of the stiffening beam;

[0042] Figure 6This is a schematic diagram of the installation of the cable saddle on the top of the main tower;

[0043] Figure 7 This is a transverse schematic diagram of the installation of the cable tensioning cable between the low cable and the high cable;

[0044] Figure 8 This is a schematic diagram of the installation and connection between the stiffening beam and the sling;

[0045] Fig. 9 It is a schematic diagram of a completed single-span four-main-cable suspension bridge with global distributed energy dissipation function;

[0046] Fig.10 It is a schematic diagram of a completed bridge of a four-main-cable suspension bridge with a multi-span system and a global distributed energy dissipation function;

[0047] In the figure: 1-low cable, 2-high cable, 3-cable cable, 4-low cable saddle, 5-high cable saddle, 6-low cable loose cable anchoring structure, 7-high cable loose cable anchoring structure, 8-anchor foundation, 9-side main tower, 10-middle main tower, 11-cap, 12-foundation, 13-stiffening beam, 14-elastic damping device, 15-tensioning device, 16-sling. DETAILED DESCRIPTION

[0048] 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.

[0049] like Figures 1 to 10 As shown in Figure 1, the construction method of a four-main-cable suspension bridge with global distributed energy dissipation is

[0050] The existing technology has the following problems: (1) 2,300 meters is the current maximum span, and the span needs to be further increased; (2) when the span is large or the load is heavy, the main cable diameter is too large, resulting in greater difficulty in cable strand installation, longer construction period, reduced cable clamp tightening efficiency, and heavy cable saddle lifting weight; (3) large lateral deformation, endangering driving comfort and safety; (4) wind-induced flutter and vortex vibration are prone to occur, and the wind resistance performance is poor; (6) the main cable cannot be replaced, lacks maintainability, and affects the life of the bridge. The four-main-cable suspension bridge with global distributed energy dissipation function has four main cables arranged in two different vertical angles. The low cable and the high cable are connected by cable-stayed cables, which realizes the coordinated force of the low cable and the high cable, and can adjust the load-bearing ratio and line shape of the low cable and the high cable, realize the global distributed energy dissipation function of the main cable, improve the vibration reduction and energy dissipation capacity of wind, vehicle and bridge vibration, and thus improve the wind stability and wind-induced vibration resistance of the bridge structure. It is suitable for the construction of suspension bridges with a main span of 2500 to 5000 meters and the improvement and transformation of the main cable bearing performance of existing suspension bridges. However, as a new large-span four-main-cable suspension bridge structure system, there is a lack of corresponding construction methods. The development of a matching, simple and easy-to-implement construction method has important application value and engineering significance for the development of bridges in ultra-large-span suspension bridges and suspension bridge performance improvement technologies.

[0051] In order to solve the above technical problems, the present application proposes a construction method for a four-main-cable suspension bridge with a global distributed energy dissipation function.

[0052] The construction method of the present invention is further described below in conjunction with the accompanying drawings.

[0053] The present invention provides a construction method for a four-main-cable suspension bridge with a global distributed energy dissipation function, including a new construction method and a reconstruction construction method. The new construction method includes the following steps:

[0054] Step 1: constructing an anchor foundation 8, a low cable anchor structure 6 and a high cable anchor structure 7 on the ground at both ends of the suspension bridge;

[0055] Step 2: constructing a foundation 12 on the ground where the main tower of the suspension bridge is installed, and constructing a cap 11 and the main tower 9 or 10 on the foundation;

[0056] Step 3: Install the low cable saddle 4 and the high cable saddle 5 on the top surface of the main tower;

[0057] Step 4: Install the low cable catwalk and the high cable catwalk between the anchor and the top surface of the main tower; before this, complete the production of the low cable strand, the high cable strand, the cable clamp, and the cable stay;

[0058] Step 5: Install the low cable strand on the low cable catwalk and the high cable strand on the high cable catwalk, and complete the cable tightening, wire winding, and cable clamp installation to form the low cable 1 and high cable 2 in the empty cable state; the line shape of the low cable 1 and high cable 2 in the empty cable state should meet the line shape control requirements;

[0059] Step 6: Starting from the saddle at the top of the tower, install the cable stays 3 in sequence towards the mid-span of the main span and the anchorage direction of the side span; due to the different vertical span ratios, the distance between the low cable 1 and the high cable 2 when the cables are empty is greater than the distance between the low cable and the high cable when the bridge is completed. During the installation process, temporary stays can be used to pull the low cable 1 and the high cable 2 at the location to be installed;

[0060] Step 7: Perform linear measurement and linear control analysis of the low cable 1 and the high cable 2 again, calculate and adjust the length of the stiffening beam sling 16, and install the stiffening beam sling 16 at the inner cable clamp;

[0061] Step 8: Install the stiffening beam 13, and construct the road pavement, anti-collision guardrail, lighting facilities, etc.;

[0062] Step 9: According to the load distribution ratio and linear control requirements of the low cable 1 and the high cable 2, the length of the cable stay 3 is adjusted again to complete the construction of the bridge structure.

[0063] The reconstruction construction method comprises the following steps:

[0064] Step 1: construct a high cable anchoring structure 7 and its foundation 8 at a certain distance from the far end of the anchor of the existing suspension bridge;

[0065] Step 2: reinforce the foundation 12 and the main tower 9 or 10 of the existing suspension bridge as needed, increase the main tower top space as needed to install the high cable saddle 5, and reinforce the tower top structure where the high cable saddle 5 is installed and add a saddle force transmission structure;

[0066] Step 3: Install the high cable saddle 5 on the top surface of the main tower;

[0067] Step 4: Install the high cable catwalk between the high cable anchoring structure 7 and the top surface of the main tower; before this, complete the production of high cable strands, cable clamps, and cable stays;

[0068] Step 5: Install high cable strands on the high cable catwalk, and complete cable tightening, wire winding, and cable clamp installation; form a high cable 2 in an empty cable state; the line shape of the high cable 2 in the empty cable state should meet the line shape control requirements;

[0069] Step 6: Starting from the saddle at the top of the tower, install the cable cables 3 in turn towards the mid-span of the main span and the anchorage direction of the side span; due to the different vertical span ratios and the existing low cable 1 already connected to the stiffening beam 13, the distance between the high cable 2 and the existing low cable 1 when the cable is empty is greater than the distance of the completed bridge. During the installation process, temporary cables can be used to pull the low cable 1 and the high cable 2 at the location to be installed;

[0070] Step 7: Remove and replace the stiffening beam 13 and the stiffening beam sling 16 in sections from the mid-span and anchorage toward the main tower;

[0071] Step 8: Complete the construction of road pavement, anti-collision guardrails, lighting facilities, etc.;

[0072] Step 9: According to the load distribution ratio and linear control requirements of the low cable 1 and the high cable 2, the length of the cable stay 3 is adjusted again to complete the construction of the bridge structure.

[0073] If the bridge structure is a multi-span structural system, the main spans should be installed synchronously; if synchronous installation cannot be achieved, the segment difference must be strictly controlled based on the ability of the middle main tower 10 and the saddle of the suspension bridge to withstand unbalanced forces and the friction of the low cable and the high cable in the saddle to resist sliding.

[0074] The tension of the cable-stayed cables varies greatly during construction and bridge operation. The cable body, tensioning device, elastic damping device, etc. must meet both the safety verification requirements during construction and the fatigue verification requirements during operation. If necessary, additional temporary cables are added during construction to ensure the structural safety of the cable-stayed cables, and the temporary cables are removed at an appropriate time.

[0075] Specific as Figures 1 to 8 As shown, a construction method for a four-main-cable suspension bridge with a global distributed energy dissipation function includes the installation of a low cable 1, a high cable 2, an inter-cable cable 3, a low cable saddle 4, a high cable saddle 5, a low cable scattered cable anchoring structure 6, a high cable scattered cable anchoring structure 7, an anchor foundation 8, a side main tower 9, a middle main tower 10, a cap 11, a foundation 12, a stiffening beam 13, and a sling 16 and the process steps thereof.

[0076] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0077] (1) The new construction method provided by the present invention can successfully realize the construction of a four-main-cable suspension bridge with a global distributed energy dissipation function, which is an advanced bridge type with more reasonable structure and performance design, greater lateral stiffness, stronger wind and earthquake resistance and vibration reduction and energy dissipation capabilities, and extremely large theoretical spanning capacity, filling the gap in existing construction technology and having good application value;

[0078] (2) The reconstruction construction method provided by the present invention can be used to reinforce or transform an existing suspension bridge to make it a four-main-cable suspension bridge structure system with global distributed energy dissipation function, which has good technical and economic benefits;

[0079] (3) The construction method of the present invention is simple and clear, and the synchronous construction method is mostly adopted, which can greatly shorten the construction period and save construction costs;

[0080] (4) The present invention has high requirements on the linear monitoring and control during the construction process and the technical level of the construction personnel, which is conducive to improving my country's advanced construction technology and equipment and cultivating high-level construction technicians.

[0081] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A construction method for a four-main-cable suspension bridge with global distributed energy dissipation, characterized in that: The method comprises a new construction method, wherein the new construction method comprises the following steps: Step 1: construct anchor foundations, low cable anchor structures and high cable anchor structures on the ground at both ends of the suspension bridge; Step 2: construct the main tower foundation on the ground where the main tower of the suspension bridge is installed, and construct the main tower cap and the main tower on the foundation; Step 3: Install low cable saddle and high cable saddle on the top of the main tower; Step 4: Install the low cable catwalk and high cable catwalk between the anchor and the top surface of the main tower; before this, complete the production of the low cable strand, high cable strand, cable clamp, and cable stay; Step 5: Install low cable strands on the low cable catwalk and high cable strands on the high cable catwalk, and complete cable tightening, wire winding, and cable clamp installation to form low cables and high cables in the empty cable state; the line shape of the low cables and high cables in the empty cable state should meet the line shape control requirements; Step 6: Starting from the saddle at the top of the tower, install the cable stays in sequence towards the middle of the main span and the anchorage of the side span; Step 7: Perform linear measurement and linear control analysis of the low cable and high cable again, calculate and adjust the length of the stiffening beam suspension cable, and install the stiffening beam suspension cable at the inner cable clamp; Step 8: Install stiffening beams, construct road pavement, anti-collision guardrails, and lighting facilities; Step 9: According to the load distribution ratio and linear control requirements of the low cable and the high cable, the length of the cable stays is adjusted again to complete the construction of the bridge structure.

2. The method according to claim 1, characterized in that It also includes a reconstruction construction method, which includes the following steps: Step 1: construct a high cable anchoring structure and its foundation at a certain distance from the far end of the anchorage of the existing suspension bridge; Step 2: reinforce the main tower foundation and main tower of the existing suspension bridge as needed, increase the main tower top space as needed to install the high cable saddle, and reinforce the tower top structure where the high cable saddle is installed and add a saddle force transmission structure; Step 3: Install the high cable saddle on the top of the main tower; Step 4: Install the high cable catwalk between the high cable anchoring structure and the top surface of the main tower; before this, complete the production of high cable strands, cable clamps, and cable stays; Step 5: Install high cable strands on the high cable catwalk, and complete the cable tightening, wire winding, and cable clamp installation; form a high cable in an empty cable state; the line shape of the high cable in the empty cable state should meet the line shape control requirements; Step 6: Starting from the saddle at the top of the tower, install the cable stays in sequence towards the middle of the main span and the anchorage of the side span; Step 7: Remove and replace the stiffening beams and stiffening beam suspension cables in sections from the mid-span and anchorage towards the main tower; Step 8: Complete the construction of road pavement, anti-collision guardrails and lighting facilities; Step 9: According to the load distribution ratio and linear control requirements of the low cable and the high cable, the length of the cable stays is adjusted again to complete the construction of the bridge structure.

3. The method according to claim 1, characterized in that If the bridge structure is a multi-span structure system, the main spans should be installed synchronously; if synchronous installation cannot be achieved, the segment difference must be strictly controlled based on the ability of the middle main tower 10 and the saddle of the suspension bridge to withstand unbalanced forces and the friction force of the low cable and the high cable in the saddle to resist sliding; The tension of the cable-stayed cable varies greatly during construction and bridge operation. The cable body, tensioning device and elastic damping device must meet both the safety calculation requirements during construction and the fatigue calculation requirements during operation.

4. The method according to claim 1, characterized in that In step 6 of the new construction method, due to the different vertical-span ratios, the distance between the low cable and the high cable when the cables are empty is greater than the distance between the low cable and the high cable when the bridge is completed. During the installation process, temporary cables are used to pull the low cable and the high cable at the location to be installed.

5. The method according to claim 1, characterized in that In step 6 of the reconstruction construction method, due to the different vertical-span ratios and the existing low cable already connected to the stiffening beam, the distance between the high cable and the existing low cable when the cable is empty is greater than the distance of the completed bridge. During the installation process, temporary cables are used to pull the low cable and the high cable at the location to be installed.

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