Construction Method of Cross-sea Cable-stayed Bridge

Abstract

The present invention discloses a method for constructing a cross-sea cable-stayed bridge, the method comprising: respectively setting up pier-side supports on each main pier cap, and respectively setting up auxiliary supports at each auxiliary pier; wherein the top surface elevation error between the pier-side supports and the auxiliary supports is less than or equal to 5 mm; constructing a main trestle along the bridge direction at the pier; constructing a branch trestle on one side of the main trestle; constructing a plurality of main longitudinal beam segments using a construction and transportation platform to obtain a plurality of formed beam grid system steel beam segments; constructing a bridge and a bridge tower using a plurality of formed beam grid system steel beam segments to form the cross-sea cable-stayed bridge. The present invention controls the elevation error of the pier-side supports and the auxiliary supports to be less than or equal to 5 mm, thereby preventing the elevation error between the pier-side supports and the auxiliary supports from being too large during the construction of the bridge, preventing the construction line of the bridge from being out of control, reducing the difficulty of bridge construction, and improving the construction efficiency of the cross-sea cable-stayed bridge.

Description

Technical Field

[0001] The invention relates to the technical field of cross-sea cable-stayed bridge engineering, and in particular to a construction method of a cross-sea cable-stayed bridge. Background Art

[0002] A cross-sea cable-stayed bridge is a bridge that spans a bay, strait, deep sea, estuary or other marine waters, and generally has a longer span and line.

[0003] In the related art, the main tower of a cross-sea cable-stayed bridge is also called a cable tower, which refers to a tower-shaped structure that supports the main cable of a suspension bridge or a cable-stayed bridge. Common cable tower forms include single-column, A-shaped, and inverted Y-shaped along the longitudinal direction of the bridge, and single-column, double-column, portal, inclined-leg portal, inverted V-shaped, inverted Y-shaped, and A-shaped along the transverse direction of the bridge. Plane towers are commonly used, while space cable towers and large-angle space gem-shaped complex linear cable towers are not commonly used.

[0004] However, the construction of a proposed sea-crossing cable-stayed bridge with large-angle spatial gem-shaped complex linear cable towers is difficult, resulting in low overall construction efficiency of the sea-crossing cable-stayed bridge. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for constructing a cross-sea cable-stayed bridge, aiming to solve the technical problem in the prior art that when constructing a cross-sea cable-stayed bridge with a large-angle spatial gem-shaped complex linear cable tower, the construction is difficult, resulting in low overall construction efficiency of the cross-sea cable-stayed bridge.

[0006] To achieve the above object, the present invention proposes a method for constructing a cross-sea cable-stayed bridge, the cross-sea cable-stayed bridge comprising piers and temporary supports, the piers comprising a plurality of main tower piers and a plurality of auxiliary piers and side piers, the bottom surface of each of the main tower piers is provided with a main pier cap, and both sides of each of the main tower piers are provided with the auxiliary piers, the method for constructing a cross-sea cable-stayed bridge comprising:

[0007] A pier support is set up on each main pier cap, and an auxiliary support is set up at each auxiliary pier, and temporary piers are set up on both sides of the bridge outside the pier support; wherein the top surface elevation error between the pier support and the auxiliary support and the temporary pier is less than or equal to 5mm;

[0008] The main trestle is constructed on one side of the pier along the direction of the bridge;

[0009] A branch trestle is constructed on one side of the main trestle corresponding to each pier, and the branch trestle passes through each pier side support and each auxiliary pier to obtain a construction and transportation platform;

[0010] The construction and transportation platform is used to construct a plurality of main longitudinal beams, transverse beams, and small longitudinal beam segments, thereby obtaining a plurality of formed grid system steel beam segments;

[0011] The steel-concrete composite beam bridge deck, bridge deck, bridge tower and cable-stayed cables are constructed using a plurality of formed grid system steel beam segments to form the sea-crossing cable-stayed bridge.

[0012] Optionally, the plurality of main longitudinal beam segments include a first beam segment and a second beam segment, and the step of using the construction and transportation platform to construct a plurality of main longitudinal beams, cross beams, and small longitudinal beam segments to obtain a plurality of formed grid system steel beam segments includes:

[0013] A plurality of sliding blocks are respectively arranged on each of the pier side brackets;

[0014] Transporting the first beam section and the second beam section to the branch trestle via the main trestle;

[0015] Installing the first beam section and the second beam section on the corresponding sliding blocks respectively;

[0016] Installing a first transverse and longitudinal beam matching the first beam segment at the segment where the first beam segment is located to obtain a first beam grid system steel beam segment;

[0017] A second transverse and longitudinal beam matching the second beam section is installed in the section where the second beam section is located to obtain a second beam grid system steel beam section.

[0018] Optionally, the step of using the construction and transportation platform to construct a plurality of main longitudinal beams, transverse beams, and small longitudinal beam segments to obtain a plurality of formed grid system steel beam segments includes:

[0019] The first beam grid system steel beam segment and the second beam grid system steel beam segment are installed respectively, so that the first beam grid system steel beam segment and the second beam grid system steel beam segment are located at a set position, wherein during the installation process, the first beam grid system steel beam segment and the second beam grid system steel beam segment are separated from each other, and a plurality of beam grid system steel beam segments to be constructed are obtained;

[0020] Construction is carried out on a plurality of the grid system steel beam segments to be constructed to obtain a plurality of formed grid system steel beam segments.

[0021] Optionally, the step of constructing a plurality of the to-be-constructed grid system steel beam segments to obtain a plurality of formed grid system steel beam segments comprises:

[0022] During the installation process, the first beam grid system steel beam segment and the second beam grid system steel beam segment are subjected to full-process linear monitoring to obtain full-process linear monitoring information;

[0023] According to the full-course linear monitoring information, linear adjustments are performed on the first grillage system steel beam segment and the second grillage system steel beam segment located at the set position;

[0024] After the linear adjustment is completed, construction is carried out at the designed position to obtain a plurality of formed steel beam segments of the beam grid system.

[0025] Optionally, the step of using a plurality of formed grid system steel beam segments to construct a steel-concrete composite beam bridge deck, a bridge deck, a bridge tower, and a cable-stayed cable to form the sea-crossing cable-stayed bridge comprises:

[0026] Installing a first fully-rotating crane on the first beam grid system steel beam segment, and installing a second fully-rotating crane on the second beam grid system steel beam segment;

[0027] Using the first fully-revolving crane to construct the first beam grid system steel beam segment to obtain a first steel beam to be closed, and using the second fully-revolving crane to construct the second beam grid system steel beam segment to obtain a second steel beam to be closed;

[0028] Laying a first steel bridge panel on the first steel beam to be closed to obtain a first closed section, and laying a second steel bridge panel on the second steel beam to be closed to obtain a second closed section;

[0029] Performing closing construction on the first section to be closed and the second section to be closed to form the sea-crossing cable-stayed bridge;

[0030] When constructing the steel beam segments of the beam grid system, a bridge tower is simultaneously formed on the bottom of the tower column in the main tower pier to obtain the main tower of the cross-sea cable-stayed bridge;

[0031] Cables are tensioned on the main tower and the bridge to form the sea-crossing cable-stayed bridge.

[0032] Optionally, the step of using the first fully-revolving crane to construct the first grid system steel beam segment to obtain a first steel beam to be closed, and using the second fully-revolving crane to construct the second grid system steel beam segment to obtain a second steel beam to be closed includes:

[0033] Using the first fully-revolving crane, installing a first steel beam on the first beam grid system steel beam segment, and simultaneously using the second fully-revolving crane, installing a second steel beam on the second beam grid system steel beam segment; wherein, during the installation process, the construction gap between one end of the first steel beam and one end of the second steel beam is gradually reduced;

[0034] When the construction gap meets the design requirements, steel bridge panels are laid on the first steel beam and the second steel beam to obtain a first steel beam to be closed and a second steel beam to be closed.

[0035] Optionally, the step of laying a first steel bridge deck on the first steel beam to be closed to obtain a first closed section, and laying a second steel bridge deck on the second steel beam to be closed to obtain a second closed section comprises:

[0036] The first fully-revolving crane is arranged on the first steel beam, and the first steel beam bridge deck is installed on the first steel beam by using the first fully-revolving crane to obtain the first section to be closed;

[0037] The second fully-revolving crane is arranged on the second steel beam, and the second steel beam bridge deck is installed on the second steel beam by using the second fully-revolving crane to obtain the second section to be closed.

[0038] Optionally, the step of performing closing construction on the first section to be closed and the second section to be closed to form the cross-sea cable-stayed bridge comprises:

[0039] Adjusting the relative position between the first steel beam and the second steel beam so that the relative position between the first steel beam to be closed and the second steel beam to be closed meets the design requirements;

[0040] The first full-revolving crane and the second full-revolving crane are used to install the closing section body and the closing section bridge deck at the first section to be closed and the second section to be closed to form the main beam of the cross-sea cable-stayed bridge.

[0041] Optionally, when constructing the grid system steel beam segments, simultaneously forming a bridge tower on the tower base to obtain the main tower of the sea-crossing cable-stayed bridge includes:

[0042] forming a tower base on the main tower pier cap;

[0043] The construction of the main tower pier is suspended after reaching the bottom of the middle tower column, and the construction is resumed to form the bridge tower after the cable-free beam section of the tower area is installed; wherein the bridge tower is constructed simultaneously with the first steel beam and the second steel beam (excluding the cable-free beam section of the tower area) to obtain the main tower of the cross-sea cable-stayed bridge.

[0044] Optionally, the step of tensioning cables on the main tower and the steel-concrete composite beam to form the sea-crossing cable-stayed bridge includes:

[0045] When the installation of the closing section is completed, the construction of the main tower is completed, and multiple cables are tensioned in sequence on both sides of the main tower along the longitudinal direction of the bridge; wherein one end of the cable is connected to the steel-concrete composite beam, and the other end of the cable is connected to the main tower;

[0046] Installing the auxiliary structure of the sea-crossing cable-stayed bridge;

[0047] The cable force is finally adjusted and a load test is carried out to complete the construction of the sea-crossing cable-stayed bridge and obtain the sea-crossing cable-stayed bridge.

[0048] The technical solution of the present invention controls the elevation error of the pier-side support and the auxiliary support to be less than or equal to 5 mm, thereby preventing the elevation error between the pier-side support and the auxiliary support from being too large during bridge construction, thereby preventing the construction line of the bridge from getting out of control. In addition, by forming a construction and transportation platform at the pier, land transportation conditions are provided for the transportation of bridge components, facilitating the transportation of bridge components to the designed installation positions via the construction and transportation platform, and providing a construction working surface for installing bridge components, thereby reducing the difficulty of bridge construction and improving the construction efficiency of cross-sea cable-stayed bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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 the structures shown in these drawings without paying creative work.

[0050] Figure 1 It is a schematic diagram of the process of the construction method of the sea-crossing cable-stayed bridge of the present invention;

[0051] Figure 2 It is a schematic diagram of the installation structure of the pier side support and the auxiliary support of the present invention;

[0052] Figure 3 It is a schematic diagram of the top view of the structure of the pier side support and the auxiliary support of the present invention;

[0053] Figure 4 It is a schematic diagram of the installation process of the first beam section and the second beam section of the present invention;

[0054] Figure 5 It is a schematic diagram of the installation process of the first beam section of the present invention;

[0055] Figure 6 It is a schematic diagram of the installation process of the second beam section of the present invention;

[0056] Figure 7 It is a schematic diagram of the installation process of the steel beam segment of the beam grid system to be constructed according to the present invention;

[0057] Figure 8 It is a schematic diagram of the installation process of the full-slewing crane of the present invention;

[0058] Fig. 9 It is a schematic diagram of the bridge deck installation process of the sea-crossing cable-stayed bridge of the present invention;

[0059] Fig.10It is a schematic diagram of the installation process of the closing section panel of the sea-crossing cable-stayed bridge of the present invention;

[0060] Fig.11 It is a schematic diagram of the cable installation process of the sea-crossing cable-stayed bridge of the present invention;

[0061] Fig.12 It is a schematic diagram of the overall structure of the sea-crossing cable-stayed bridge of the present invention.

[0062] Description of Figure Numbers:

[0063] Label name Label name 100 Main tower pier 200 main pier cap 300 Pier side support 400 Auxiliary bracket 500 First beam section 600 The second beam section 700 Temporary pier 800 Full-slewing crane 900 hoist

[0064] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0065] 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.

[0066] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0069] In the related art, the main tower of a cross-sea cable-stayed bridge is also called a cable tower, which refers to a tower-shaped structure that supports the main cable of a suspension bridge or a cable-stayed bridge. Common cable tower forms include single-column, A-shaped and inverted Y-shaped along the longitudinal direction of the bridge, and single-column, double-column, portal, inclined-leg portal, inverted V-shaped, inverted Y-shaped, A-shaped, and complex linear cable towers with large inclination angles and space gem-shaped along the transverse direction of the bridge.

[0070] However, the construction of a proposed sea-crossing cable-stayed bridge with large-angle spatial gem-shaped complex linear cable towers is difficult, resulting in low overall construction efficiency of the sea-crossing cable-stayed bridge.

[0071] To this end, the present invention provides a method for constructing a cross-sea cable-stayed bridge, which controls the elevation error of the pier-side support and the auxiliary support to be less than or equal to 5 mm. During the construction of the bridge, the uncontrollable construction line shape of the main beam caused by the excessive elevation error between the pier-side support and the auxiliary support is reduced. In addition, by forming a construction and transportation platform at the pier, land transportation conditions are provided for the transportation of bridge components, which facilitates the transportation of bridge components to the designed installation position through the construction and transportation platform, and provides a construction working surface for installing the bridge components, thereby reducing the construction difficulty of the bridge and improving the construction efficiency of the cross-sea cable-stayed bridge.

[0072] The concept of the present invention is further described below in conjunction with some specific embodiments.

[0073] Reference Figure 1 , Figure 1 It is a schematic diagram of the process of the construction method of the sea-crossing cable-stayed bridge of the present invention.

[0074] In one embodiment of the present invention, Figure 1 As shown, the cross-sea cable-stayed bridge includes piers and temporary supports, the piers include a plurality of main tower piers 100 and a plurality of auxiliary piers and side piers, the bottom surface of each main tower pier 100 is provided with a main pier cap 200, and both sides of each main tower pier 100 are provided with auxiliary piers, and the construction method of the cross-sea cable-stayed bridge includes:

[0075] S100: Build pier-side supports 300 on each main pier cap 200, build auxiliary supports 400 at each auxiliary pier, and build temporary piers on both sides along the bridge outside the pier-side supports 300; wherein the top surface elevation error between the pier-side supports 300, the auxiliary supports 400 and the temporary piers is less than or equal to 5 mm;

[0076] S200: The main trestle is constructed along the bridge direction on one side of the pier;

[0077] S300: constructing a branch trestle corresponding to each pier on one side of the main trestle, and the branch trestle passes through the brackets 300 beside each pier and each auxiliary pier to obtain a construction and transportation platform;

[0078] S400: using a construction and transportation platform to construct a plurality of main longitudinal beams, transverse beams, and small longitudinal beam segments, thereby obtaining a plurality of formed beam grid system steel beam segments;

[0079] S500: Use multiple formed grid system steel beam segments to construct the steel-concrete composite beam bridge deck, bridge deck, bridge towers and cable-stayed bridges to form a cross-sea cable-stayed bridge.

[0080] For ease of understanding, a specific implementation is shown below:

[0081] Reference Figure 2 and Figure 3 , Figure 2 FIG. 1 is a schematic diagram of the installation structure of the pier side support 300 and the auxiliary support 400 of the present invention. Figure 3 FIG. 4 is a schematic diagram of a top view of the pier side support 300 and the auxiliary support 400 of the present invention. Figure 2 and Figure 3 As shown:

[0082] F110: Use a pile driving device and a 135t crawler crane to install the pier support 300, auxiliary pier support, and temporary pier 700 groups, and ensure the relative position and corresponding depth of the steel pipe piles according to the drawing dimensions to form a construction and transportation platform. Among them, the pier support 300 is equipped with a slide beam and a slider, which are used to drag and install the steel beam.

[0083] In order to ensure the linear shape of the steel beam construction, the support needs to have sufficient rigidity, strength and stability, and when the pier side support 300, auxiliary pier support and temporary pier 700 are installed, the top surface elevation error between the pier side support 300 and the auxiliary support 400 is less than or equal to 5mm.

[0084] Reference Figure 4 , Figure 4 FIG. 5 is a schematic diagram of the installation process of the first beam section 500 and the second beam section 600 of the present invention, as shown in FIG. Figure 4 As shown:

[0085] It can be understood that there are two symmetrically arranged main tower piers 100 on the cross-sea cable-stayed bridge, and a first pier-side support 300 and a second pier-side support 300 are respectively constructed at the two main tower piers 100;

[0086] F210: transport the first LB (LB refers to the beam section cantilevered at both ends of the beam) to the trestle next to the pier support 300, i.e., the construction transportation platform, through the trestle, use a 135t crawler crane to synchronously hoist the first LB to the first pier support 300, and use a slider to slide the first LB to the slideway beam;

[0087] F220: Install the second LB on the second pier side bracket 300, and use a slider to slide the second LB to the slideway beam;

[0088] F230: A 135t crawler crane was used to hoist the relevant transverse and longitudinal beams of the first LB and the second LB of the segment, and a winch 900 was used to drag the first LB and the second LB to the designed positions respectively, thus completing the installation of the first LB and the second LB.

[0089] Reference Figure 5 and Figure 6 , Figure 5 Schematic diagram of the installation process of the first beam section 500 of the present invention. Figure 6 FIG. 6 is a schematic diagram of the installation process of the second beam section 600 of the present invention. Figure 5 and Figure 6 As shown:

[0090] F310: transport the first H2 (H2 represents the mid-span beam section) to the trestle next to the pier support 300, i.e., the construction transportation platform, by using the trestle, use a 135t crawler crane to synchronously hoist the first H2 onto the first pier support 300, and use a slider to slide the first H2 to the slideway beam;

[0091] F320: Install the second H2 onto the second pier side bracket 300, and use a slider to slide the second H2 to the slideway beam;

[0092] F330: A 135t crawler crane is used to hoist the relevant transverse and longitudinal beams of the first H2 and second H2 segments, and the winch 900 is used to drag the first H2 and second H2 to the designed positions respectively to complete the installation of the first H2 and second H2, that is, the winch is installed on the pier. In order to cooperate with the use of the winch, a pulley assembly is provided on the pier side bracket 300.

[0093] F410: transport the first LA (LA represents the beam section cantilevered at one end of the beam) to the trestle next to the pier support 300, i.e., the construction transportation platform, through the trestle, use a 135t crawler crane to synchronously hoist the first LA to the first pier support 300, and use a slider to slide the first LA to the slideway beam;

[0094] F420: Install the second LA on the second pier side bracket 300, and use a slider to slide the second LA to the slideway beam;

[0095] F430: A 135t crawler crane was used to hoist the relevant transverse and longitudinal beams of the first LA and the second LA of the segment, and the winch 900 was used to drag the first LA and the second LA to the designed positions respectively, completing the installation of the first LA and the second LA.

[0096] Reference Figure 7 , Figure 7 FIG. 1 is a schematic diagram of the installation process of the steel beam segment of the beam grid system to be constructed according to the present invention, as shown in FIG. Figure 7 As shown:

[0097] F510: Use a truck to transport the LB and LA segments to the trestle near the pier support 300, i.e., the construction transportation platform, and use a 135t crawler crane to synchronously hoist the main longitudinal beams LB and LA to the first pier support 300 and the second pier support 300;

[0098] F520: Crawler crane is used to hoist the longitudinal and transverse beams of LA and LB respectively;

[0099] F530: Perform linear adjustments and beam removal, and remove slideway beams, winch 900 and other towing equipment.

[0100] The entire linear shape should be monitored during installation to ensure that the linear shape of the steel beam is adjusted to the design requirements, and the installation process must meet the specifications.

[0101] Reference Figure 8 , Figure 8 FIG. 8 is a schematic diagram of the installation process of the full-slewing crane 800 of the present invention, as shown in FIG. Figure 8 As shown:

[0102] F610: Transport the components of the full-slewing crane 800 to the trestle near the pier support 300, and use two 135t crawler cranes to synchronously install the two full-slewing cranes 800 from bottom to top;

[0103] Reference Fig. 9 , Fig. 9 FIG. 1 is a schematic diagram of the bridge deck installation process of the sea-crossing cable-stayed bridge of the present invention, as shown in FIG. Fig. 9 As shown:

[0104] F710: Full-slewing crane 800 carries out steel beam installation simultaneously: first install the main longitudinal beams on both sides, then install the cross beams and small longitudinal beams;

[0105] F720: The fully revolving crane 800 moves to the top of the installed steel beam and rotates to lift H2 and the steel beam bridge deck.

[0106] Reference Fig.10, Fig.10 FIG. 1 is a schematic diagram of the installation process of the closing section panel of the sea-crossing cable-stayed bridge of the present invention, as shown in FIG. Fig.10 As shown:

[0107] F810: Adjust the position of the steel beam before closing, and install the closing section with the full-slewing crane 800;

[0108] F820: Full-slewing crane 800 lifting and closing section bridge deck.

[0109] Reference Fig.11 , Fig.11 FIG. 1 is a schematic diagram of the cable installation process of the sea-crossing cable-stayed bridge of the present invention, as shown in FIG. Fig.11 As shown:

[0110] F910: Full-slewing crane 800 hoists the steel-concrete composite beam bridge deck, and the steel bridge installation is completed;

[0111] F920: At this time, the main tower is completed and the cables are tensioned symmetrically in sequence.

[0112] Reference Fig.12 , Fig.12 FIG. 1 is a schematic diagram of the overall structure of the sea-crossing cable-stayed bridge of the present invention. Fig.12 As shown:

[0113] G100: dismantle the full-slewing crane and temporary supports and other temporary structures, namely the pier side support 300, auxiliary support 400 and temporary pier 700 group;

[0114] G200: Install the remaining auxiliary structures;

[0115] G300: Final adjustment of cable force, load test, and final acceptance.

[0116] The technical solution of the present invention controls the elevation error of the pier-side support 300 and the auxiliary support 400 to be less than or equal to 5 mm. During the construction of the bridge, the situation that the elevation error between the pier-side support 300 and the auxiliary support 400 is too large is prevented, thereby preventing the construction line shape of the main beam from getting out of control. In addition, by forming a construction and transportation platform at the pier, land transportation conditions are provided for the transportation of bridge components, which facilitates the transportation of bridge components to the designed installation position via the construction and transportation platform, and provides a construction working surface for the installation of bridge components, thereby reducing the difficulty of bridge construction and improving the construction efficiency of the cross-sea cable-stayed bridge.

[0117] In this embodiment, the plurality of main longitudinal beam segments include a first beam segment 500 and a second beam segment 600. The steps of using a construction and transportation platform to construct a plurality of main longitudinal beams, cross beams, and small longitudinal beam segments to obtain a plurality of formed grid system steel beam segments include:

[0118] Q100: A plurality of sliding blocks are respectively arranged on the brackets 300 beside each pier;

[0119] Q200: transport the first beam section 500 and the second beam section 600 to the branch trestle via the main trestle;

[0120] Q300: Install the first beam section 500 and the second beam section 600 on corresponding sliders respectively;

[0121] Q400: Installing a first transverse and longitudinal beam matching the first beam segment 500 at the segment where the first beam segment 500 is located, to obtain the first beam segment 500;

[0122] Q500: Install second transverse and longitudinal beams matching the second beam segment 600 in the section where the second beam segment 600 is located to obtain the second beam segment 600.

[0123] A slider is provided on the pier side bracket 300 to facilitate dragging of the first beam section 500 and the second beam section 600 during the subsequent construction process, thereby saving time for installing the first beam section 500 and the second beam section 600 and improving construction efficiency.

[0124] In this embodiment, the steps of using a construction and transportation platform to construct a plurality of main longitudinal beams, transverse beams, and small longitudinal beam segments to obtain a plurality of formed grid system steel beam segments include:

[0125] W100: installing the first beam section 500 and the second beam section 600 respectively, so that the first beam section 500 and the second beam section 600 are located at set positions, wherein during the installation process, the first beam section 500 and the second beam section 600 are away from each other, and a plurality of grid system steel beam segments to be constructed are obtained;

[0126] W200: Construction is carried out on multiple grid system steel beam segments to be constructed to obtain multiple formed grid system steel beam segments.

[0127] It can be understood that when the first beam section 500 and the second beam section 600 are installed, the first beam section 500 and the second beam section 600 are respectively located on two pier-side supports 300, and the two pier-side supports 300 are spaced apart in the direction of the bridge. The first beam section 500 and the second beam section 600 are moved closer to each other during construction, that is, the construction direction of the first beam section 500 and the second beam section 600 is towards each other.

[0128] In this embodiment, the step of constructing a plurality of grid system steel beam segments to be constructed to obtain a plurality of formed grid system steel beam segments includes:

[0129] E100: During the installation process, the first beam section 500 and the second beam section 600 are subjected to full-process linear monitoring to obtain full-process linear monitoring information;

[0130] E200: According to the full-course linear monitoring information, the first beam section 500 and the second beam section 600 located at the set position are linearly adjusted;

[0131] E300: After the linear adjustment is completed, construction is carried out at the designed position to obtain multiple formed beam grid system steel beam segments.

[0132] In order to ensure that the linear shape of the first beam section 500 and the second beam section 600 after construction is completed meets the construction design requirements, the linear shape of the first beam section 500 and the second beam section 600 is monitored during the installation process of the first beam section 500 and the second beam section 600, and the linear shape monitoring process is completed by surveyors using surveying instruments.

[0133] In one embodiment, the steps of constructing a steel-concrete composite beam bridge deck, a bridge deck, a bridge tower, and a cable-stayed bridge by using a plurality of formed beam grid system steel beam segments to form a cross-sea cable-stayed bridge include:

[0134] R100: Install a first fully-rotating crane 800 on the first beam section 500 , and install a second fully-rotating crane 800 on the second beam section 600 ;

[0135] R200: using the first fully-rotating crane 800 to construct the first beam section 500 to obtain the first steel beam to be closed, and using the second fully-rotating crane 800 to construct the second beam section 600 to obtain the second steel beam to be closed;

[0136] R300: Laying a first steel bridge panel on the first steel beam to be closed to obtain a first closing section, and laying a second steel bridge panel on the second steel beam to be closed to obtain a second closing section;

[0137] R400: The first section to be closed and the second section to be closed are closed to form the main beam of the cross-sea cable-stayed bridge;

[0138] R500: When constructing the steel beam segments of the beam grid system, a bridge tower is formed on the bottom of the tower column in the main tower pier to obtain the main tower of the cross-sea cable-stayed bridge;

[0139] R600: Cables are tensioned on the main tower and the bridge to form a cross-sea cable-stayed bridge.

[0140] Before the first section to be closed and the second section to be closed are closed, a first steel bridge panel is laid on the first steel beam to be closed to obtain the first closing section, and a second steel bridge panel is laid on the second steel beam to be closed to obtain the second closing section, so as to facilitate the subsequent construction of the bridge and provide a construction plane for the subsequent construction.

[0141] In one embodiment, the steps of using a first fully-rotating crane 800 to construct the first beam section 500 to obtain a first steel beam to be closed, and using a second fully-rotating crane 800 to construct the second beam section 600 to obtain a second steel beam to be closed include:

[0142] T100: Using the first fully-rotating crane 800, the first steel beam is installed on the first beam section 500, and simultaneously using the second fully-rotating crane 800, the second steel beam is installed on the second beam section 600; wherein, during the installation process, the construction gap between one end of the first steel beam and one end of the second steel beam is gradually reduced;

[0143] T200: When the construction gap meets the design requirements, the steel bridge deck is laid on the first steel beam and the second steel beam to obtain the first steel beam to be closed and the second steel beam to be closed.

[0144] In one embodiment, the steps of laying a first steel-concrete composite bridge deck on a first steel beam to be closed to obtain a first closed section, and laying a second steel bridge deck on a second steel beam to be closed to obtain a second closed section include:

[0145] Y100: placing a first fully-rotating crane 800 on the first steel beam, and installing a first steel beam bridge deck on the first steel beam using the first fully-rotating crane 800 to obtain a first section to be closed;

[0146] Y200: Place the second full-revolving crane 800 on the second steel beam, and use the second full-revolving crane 800 to install the second steel beam bridge deck on the second steel beam to obtain the second section to be closed.

[0147] In one embodiment, the steps of closing the first section to be closed and the second section to be closed to form a cross-sea cable-stayed bridge include:

[0148] U100: Adjust the relative position between the first steel beam and the second steel beam so that the relative position between the first steel beam to be closed and the second steel beam to be closed meets the design requirements;

[0149] U200: Use the first full-revolving crane 800 and the second full-revolving crane 800 to install the closing section body and the closing section bridge deck at the first section to be closed and the second section to be closed to form a cross-sea cable-stayed bridge.

[0150] In one embodiment, when constructing the beam grid system steel beam segment, a bridge tower is simultaneously formed on the bottom of the tower column in the main tower pier to obtain the main tower of the cross-sea cable-stayed bridge, including:

[0151] A100: The tower base is formed on the main tower pier cap;

[0152] A200: A bridge tower is formed on the bottom of the tower column in the main tower pier; wherein the bridge tower is constructed simultaneously with the first steel beam and the second steel beam to obtain the main tower of the cross-sea cable-stayed bridge.

[0153] In order to ensure the construction period and improve the construction efficiency, since the aforementioned construction steps have formed a construction plane, providing a favorable construction platform for the construction of the bridge tower on the tower base, when the bridge tower is formed on it, the bridge tower and the first steel beam and the second steel beam are constructed at the same time.

[0154] In one embodiment, the step of tensioning cables on the main tower and the steel-concrete composite beam to form a cross-sea cable-stayed bridge includes:

[0155] D100: When the installation of the closing section is completed, the main tower is constructed, and multiple cables are tensioned on both sides of the main tower in the longitudinal direction of the bridge; one end of the cable is connected to the steel-concrete composite beam, and the other end of the cable is connected to the main tower;

[0156] D200: Installation of auxiliary structures of sea-crossing cable-stayed bridge;

[0157] D300: Final adjustment of the cable force and load test are carried out to complete the construction of the cross-sea cable-stayed bridge and obtain the cross-sea cable-stayed bridge.

[0158] After the installation of the auxiliary structures of the cross-sea cable-stayed bridge is completed, the cable force is finally adjusted so that the cable force meets the design requirements, and a load test is carried out to complete the construction of the cross-sea cable-stayed bridge and obtain the cross-sea cable-stayed bridge.

[0159] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for constructing a sea-crossing cable-stayed bridge, characterized in that: The cross-sea cable-stayed bridge comprises piers and temporary supports, the piers comprise a plurality of main tower piers and a plurality of auxiliary piers and side piers, the bottom surface of each of the main tower piers is provided with a main pier cap, and both sides of each of the main tower piers are provided with the auxiliary piers and side piers, and the construction method of the cross-sea cable-stayed bridge comprises: A pier support is set up on each main pier cap, and an auxiliary support is set up at each auxiliary pier, and temporary piers are set up on both sides of the bridge outside the pier support; wherein the top surface elevation error between the pier support and the auxiliary support and the temporary pier is less than or equal to 5mm; The main trestle is constructed on one side of the pier along the direction of the bridge; A branch trestle is constructed on one side of the main trestle corresponding to each pier, the branch trestle passes through each pier side support and each auxiliary pier, and the main trestle and the branch trestle form a construction and transportation platform; The construction and transportation platform is used to construct multiple main longitudinal beams, transverse beams, and small longitudinal beam segments to obtain multiple formed beam grid system steel beam segments; the multiple main longitudinal beams include a first beam segment and a second beam segment, and multiple sliders are respectively arranged on the brackets beside each pier; the first beam segment and the second beam segment are transported to the branch trestle via the main trestle; the first beam segment and the second beam segment are respectively installed on the corresponding sliders; the first transverse and longitudinal beams matching the first beam segment are installed in the segment where the first beam segment is located to obtain a first beam grid system steel beam segment; the second transverse and longitudinal beams matching the second beam segment are installed in the segment where the second beam segment is located to obtain a second beam grid system steel beam segment; the first beam grid system steel beam segment and the second beam grid system steel beam segment are respectively installed to make the first beam grid system steel beam The first steel beam segment and the second steel beam segment of the beam grid system are located at a set position, wherein, during the installation process, the first steel beam segment of the beam grid system and the second steel beam segment of the beam grid system are separated from each other, and a plurality of steel beam segments of the beam grid system to be constructed are obtained; construction is performed on the plurality of steel beam segments of the beam grid system to be constructed, and a plurality of formed steel beam segments of the beam grid system are obtained; during the installation process, the first steel beam segment of the beam grid system and the second steel beam segment of the beam grid system are subjected to full-process linear monitoring to obtain full-process linear monitoring information; according to the full-process linear monitoring information, the first steel beam segment of the beam grid system and the second steel beam segment of the beam grid system located at the set position are subjected to linear adjustment; after the linear adjustment is completed, construction is performed at the set position to obtain a plurality of formed steel beam segments of the beam grid system; The steel-concrete composite beam bridge deck, bridge deck, bridge tower and cable-stayed cables are constructed using a plurality of formed grid system steel beam segments to form the sea-crossing cable-stayed bridge.

2. The method for constructing a sea-crossing cable-stayed bridge according to claim 1, characterized in that: The step of using a plurality of formed grid system steel beam segments to construct a steel-concrete composite beam bridge deck, a bridge deck, a bridge tower, and a cable-stayed cable to form the sea-crossing cable-stayed bridge comprises: Installing a first fully-rotating crane on the first beam grid system steel beam segment, and installing a second fully-rotating crane on the second beam grid system steel beam segment; Using the first fully-revolving crane to construct the first beam grid system steel beam segment to obtain a first steel beam to be closed, and using the second fully-revolving crane to construct the second beam grid system steel beam segment to obtain a second steel beam to be closed; Laying a first steel bridge panel on the first steel beam to be closed to obtain a first section to be closed, and laying a second steel bridge panel on the second steel beam to be closed to obtain a second section to be closed; Performing closing construction on the first section to be closed and the second section to be closed to form the sea-crossing cable-stayed bridge; When constructing the steel beam segments of the beam grid system, a bridge tower is simultaneously formed on the bottom of the tower column in the main tower pier to obtain the main tower of the cross-sea cable-stayed bridge; Cables are tensioned on the main tower and the bridge to form the sea-crossing cable-stayed bridge.

3. The method for constructing a sea-crossing cable-stayed bridge according to claim 2, characterized in that: The step of using the first fully-revolving crane to construct the first beam grid system steel beam segment to obtain a first steel beam to be closed, and using the second fully-revolving crane to construct the second beam grid system steel beam segment to obtain a second steel beam to be closed includes: Using the first fully-revolving crane, installing a first steel beam on the first beam grid system steel beam segment, and simultaneously using the second fully-revolving crane, installing a second steel beam on the second beam grid system steel beam segment; wherein, during the installation process, the construction gap between one end of the first steel beam and one end of the second steel beam is gradually reduced; When the construction gap meets the design requirements, steel bridge panels are laid on the first steel beam and the second steel beam to obtain the first steel beam to be closed and the second steel beam to be closed.

4. The method for constructing a sea-crossing cable-stayed bridge according to claim 3, characterized in that: The step of laying a first steel bridge panel on the first steel beam to be closed to obtain a first section to be closed, and laying a second steel bridge panel on the second steel beam to be closed to obtain a second section to be closed comprises: The first fully-revolving crane is arranged on the first steel beam, and the first steel beam bridge deck is installed on the first steel beam by using the first fully-revolving crane to obtain the first section to be closed; The second fully-revolving crane is arranged on the second steel beam, and the second steel beam bridge deck is installed on the second steel beam by using the second fully-revolving crane to obtain the second section to be closed.

5. The method for constructing a sea-crossing cable-stayed bridge according to claim 3, characterized in that: The step of closing the first section to be closed and the second section to be closed to form the main beam of the sea-crossing cable-stayed bridge comprises: Adjusting the relative position between the first steel beam and the second steel beam so that the relative position between the first steel beam to be closed and the second steel beam to be closed meets the design requirements; The first full-revolving crane and the second full-revolving crane are used to install the closing section body and the closing section bridge deck at the first section to be closed and the second section to be closed to form the main beam of the cross-sea cable-stayed bridge.

6. The method for constructing a sea-crossing cable-stayed bridge according to claim 3, characterized in that: The step of simultaneously forming a bridge tower on the bottom of the tower column in the main tower pier during the construction of the grid system steel beam segment to obtain the main tower of the cross-sea cable-stayed bridge includes: forming a tower base on the main pier cap; The construction on the tower base is suspended after reaching the bottom of the tower column in the main tower pier, and the construction is resumed to form the bridge tower after the cable-free beam section steel beam of the tower area is installed; wherein the bridge tower is constructed simultaneously with the first steel beam and the second steel beam to obtain the main tower of the cross-sea cable-stayed bridge.

7. The method for constructing a sea-crossing cable-stayed bridge according to claim 2, characterized in that: The step of tensioning cables on the main tower and the steel-concrete composite beam to form the sea-crossing cable-stayed bridge comprises: When the installation of the closing section is completed, the construction of the main tower is completed, and multiple cables are tensioned in sequence on both sides of the main tower along the longitudinal direction of the bridge; wherein one end of the cable is connected to the steel-concrete composite beam, and the other end of the cable is connected to the main tower; Installing the auxiliary structure of the sea-crossing cable-stayed bridge; The cable force is finally adjusted and a load test is carried out to complete the construction of the sea-crossing cable-stayed bridge and obtain the sea-crossing cable-stayed bridge.

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