Construction method of cable-free beam section in tower area of ​​sea-crossing cable-stayed bridge

Abstract

The present invention discloses a method for constructing a cable-free beam section in a tower area of ​​a cross-sea cable-stayed bridge. The cross-sea cable-stayed bridge comprises a main tower pier and a pier-side bracket, and the pier-side bracket has an initial position. The method comprises: at the initial position, assembling the first beam section, the tower middle beam section, and the second beam section respectively by beam section; dragging and translating the first beam section, the tower middle beam section, and the second beam section to a first preset position by beam section; assembling the third beam section and the fourth beam section at the initial position; assembling the first beam section, the tower middle beam section, the second beam section, the third beam section, and the fourth beam section to form a beam section as a whole; lifting the beam section as a whole, and dropping the beam to install it to form the cable-free beam section in the tower area. The present invention reduces the construction difficulty by dividing the cable-free beam section in the tower area into a plurality of beam sections, and constructing each beam section by beam section, which is more conducive to controlling the construction period of the cable-free beam section in the tower area, improving the construction efficiency, and ensuring the construction period.

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 for a cable-free beam section in a tower area 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, during the construction of the proposed sea-crossing cable-stayed bridge with large-angle spatial gem-shaped complex linear cable towers, it is difficult to construct the cable-free beam section in the tower area of ​​the sea-crossing cable-stayed bridge, resulting in low construction efficiency and inability to guarantee the construction period. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for constructing a cable-free beam section in the tower area of ​​a cross-sea cable-stayed bridge, aiming to solve the technical problem in the prior art that it is difficult to construct the cable-free beam section in the tower area of ​​a cross-sea cable-stayed bridge, resulting in low construction efficiency and inability to guarantee the construction period.

[0006] To achieve the above-mentioned purpose, according to a first aspect of an embodiment of the present disclosure, the present invention provides a method for constructing a cable-free beam section in a tower area of ​​a cross-sea cable-stayed bridge, wherein the cross-sea cable-stayed bridge comprises a main tower pier and a pier-side bracket, wherein the pier-side bracket has an initial position, and the method for constructing a cable-free beam section in a tower area of ​​the cross-sea cable-stayed bridge comprises:

[0007] At the initial position, assembling the first beam segment, the middle beam segment of the tower and the second beam segment respectively and segment by segment;

[0008] Drag and translate the first beam segment, the beam segment in the tower, and the second beam segment to a first preset position, beam segment by beam segment; wherein the first preset position is located at the support beside the pier;

[0009] At the initial position, assembling the third beam segment and the fourth beam segment;

[0010] Assembling the first beam segment, the middle beam segment, the second beam segment, the third beam segment and the fourth beam segment to form a beam segment as a whole;

[0011] The beam section is lifted as a whole, and then dropped and installed to form a cable-free beam section in the tower area.

[0012] Optionally, the cross-sea cable-stayed bridge further comprises a plurality of piers, and before the step of assembling the first beam segment, the mid-tower beam segment and the second beam segment segment by segment at the initial position, the method further comprises:

[0013] A main trestle is constructed on one side of the pier along the longitudinal direction of the bridge, and a branch trestle is constructed on one side of the main trestle corresponding to each pier to obtain a construction and transportation platform; wherein the construction and transportation platform has a second preset position, and in the longitudinal direction of the bridge, the second preset position is set between the initial position and the main tower pier;

[0014] The first beam section, the mid-tower beam section and the second beam section are lifted from the second preset position to the initial position.

[0015] Optionally, the step of assembling the first beam segment, the middle beam segment, and the second beam segment segment by segment at the initial position includes:

[0016] Welding anchor lugs on the first beam section, the middle beam section of the tower and the second beam section respectively;

[0017] transporting the first beam section, the mid-tower beam section and the second beam section to a second preset position respectively;

[0018] The first beam section, the mid-tower beam section and the second beam section are respectively lifted to the initial positions.

[0019] Optionally, the step of assembling the first beam segment, the middle beam segment of the tower and the second beam segment segment by segment at the initial position comprises:

[0020] transporting the first cross beam and the first small longitudinal beam to the initial position;

[0021] At the initial position, the first beam section, the mid-tower beam section and the second beam section are respectively assembled using the first cross beam and the first small longitudinal beam.

[0022] Optionally, the step of dragging and translating the first beam segment, the mid-tower beam segment, and the second beam segment to a first preset position beam segment by beam segment includes:

[0023] Installing a winch on the supporting trestle;

[0024] The winch is connected to the anchor lugs on the first beam section, the tower beam section and the second beam section respectively by using steel wire ropes;

[0025] The winch is used to drag the first beam section, the mid-tower beam section and the second beam section to a first preset position respectively.

[0026] Optionally, the sea-crossing cable-stayed bridge comprises a main longitudinal beam, a second transverse beam and a second small longitudinal beam, and the step of assembling the first beam segment, the mid-tower beam segment, the second beam segment, the third beam segment and the fourth beam segment to form a beam segment as a whole comprises:

[0027] transporting the main longitudinal beam, the second cross beam and the second small longitudinal beam to an initial position;

[0028] The third beam section and the fourth beam section are assembled respectively at the initial position using the main longitudinal beam, the second transverse beam and the second small longitudinal beam, and the third beam section, the fourth beam section, the first beam section, the middle beam section of the tower and the second beam section form a beam section as a whole.

[0029] Optionally, the step of lifting the beam section as a whole and dropping the beam for installation to form the cable-free beam section of the tower area includes:

[0030] The first beam section, the middle beam section of the tower, the second beam section, the third beam section and the fourth beam section are lifted by jacks evenly distributed in sections;

[0031] Performing beam dropping construction on the entire beam section and debugging the entire beam section so that the entire beam section meets the design requirements;

[0032] The cable beam section and the closed section rods are cantilevered and assembled on the whole beam section that meets the design requirements, and temporary consolidation construction of the tower beam is carried out to form the cable-free beam section in the tower area.

[0033] Optionally, the pier-side supports are arranged along the bridge direction, and the step of dragging and translating the first beam segment, the mid-tower beam segment, and the second beam segment to a first preset position beam segment by beam segment comprises:

[0034] constructing a slideway assembly on the pier-side bracket to form a towing platform;

[0035] The towing platform is used to tow and translate the first beam segment, the middle beam segment of the tower and the second beam segment to a first preset position one by one.

[0036] Optionally, the slideway assembly includes a slideway beam and a sliding block, and the step of constructing the slideway assembly on the pier side bracket to form a towing platform includes:

[0037] Installing the slideway beam on the pier-side bracket along the longitudinal direction of the bridge to form a towing platform;

[0038] Slide blocks are installed at positions of the first beam section, the beam section in the tower and the second beam section corresponding to the towing platform, so that the first beam section, the beam section in the tower and the second beam section are slidably connected to the slideway beam respectively.

[0039] Optionally, a plurality of beam-dropping jacks are evenly arranged on the top of the cross beam under the main tower pier and the bracket beside the pier, and the steps of performing beam-dropping construction on the entire beam section and debugging the entire beam section so that the entire beam section meets the design requirements include:

[0040] Using a plurality of the beam-dropping jacks to simultaneously lift the first beam section, the beam section in the tower, the second beam section, the third beam section and the fourth beam section, so that the beam sections are lifted as a whole;

[0041] Remove the slider and the slideway beam to form a complete section of the beam to be dropped;

[0042] Pads are installed respectively on the cross beam under the main tower pier, the top of the pier side bracket and the corresponding positions of the entire section of the beam to be dropped, so that the entire beam section meets the design requirements, forming the entire beam section that meets the design requirements.

[0043] The technical solution of the present invention reduces the difficulty of constructing the cable-free beam section in the tower area of ​​the cross-sea cable-stayed bridge by dividing the cable-free beam section in the tower area into multiple beam sections, and assembles and drags the first beam section, the tower middle beam section, the second beam section, the third beam section and the fourth beam section on the pier side bracket on the main pier cap, thereby reducing the difficulty of constructing the cable-free beam section in the tower area of ​​the cross-sea cable-stayed bridge, being more conducive to controlling the construction period of the cable-free beam section in the tower area, improving the construction efficiency and ensuring the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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 any creative work.

[0045] Figure 1 It is a schematic flow chart of a construction method of a cable-free beam section in a tower area of ​​a cross-sea cable-stayed bridge according to the present invention;

[0046] Figure 2 It is a schematic diagram of the installation structure of the pier side support of the present invention;

[0047] Figure 3 It is a schematic diagram of the top view of the structure of the pier side support of the present invention;

[0048] Figure 4 It is a schematic diagram of the installation process of the first main longitudinal beam and the second main longitudinal beam of the present invention;

[0049] Figure 5 This is a schematic diagram of the installation process of the first main longitudinal beam of the present invention;

[0050] Figure 6 This is a schematic diagram of the installation process of the second main longitudinal beam of the present invention;

[0051] Figure 7 It is a schematic diagram of the installation process of the whole section of the beam to be constructed and dropped according to the present invention;

[0052] Figure 8 It is a schematic diagram of the installation process of the full-slewing crane of the present invention;

[0053] Fig. 9 It is a schematic diagram of the bridge deck installation process of the sea-crossing cable-stayed bridge of the present invention.

[0054] Label name Label name 100 Main tower pier 200 main pier cap 300 Pier side support 400 Auxiliary bracket 500 The first main longitudinal beam 600 Second main longitudinal beam 700 Temporary pier 800 Full-slewing crane 900 hoist

[0055] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0056] 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.

[0057] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] However, during the construction of the proposed sea-crossing cable-stayed bridge with large-angle spatial gem-shaped complex linear cable towers, it is difficult to construct the cable-free beam section in the tower area of ​​the sea-crossing cable-stayed bridge, resulting in low construction efficiency and inability to guarantee the construction period.

[0063] To this end, the present invention provides a construction method for a cross-sea cable-stayed bridge, which reduces the difficulty of constructing the cable-free beam section in the tower area of ​​the cross-sea cable-stayed bridge, is more conducive to controlling the construction period of the cable-free beam section in the tower area, improves the construction efficiency, and ensures the construction period.

[0064] The inventive concept of the present invention is further described below in conjunction with some specific implementation methods.

[0065] The invention provides a method for constructing a cable-free beam section in a tower area of ​​a cross-sea cable-stayed bridge.

[0066] Reference Figure 1 , Figure 1 The present invention is a schematic flow chart of a construction method for a cable-free beam section in a tower area of ​​a cross-sea cable-stayed bridge.

[0067] In one embodiment of the present invention, Figure 1 As shown, the cross-sea cable-stayed bridge includes a main tower pier 100 and a pier-side bracket 300, and the pier-side bracket 300 on the main pier cap 200 has an initial position. The construction method of the cable-free beam section of the tower area of ​​the cross-sea cable-stayed bridge includes:

[0068] S100: at the initial position, assembling the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) segment by segment;

[0069] S200: dragging and translating the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) to a first preset position, wherein the first preset position is located at the pier side support 300;

[0070] S300: assembling the third beam segment (LA2) and the fourth beam segment (LB2) at the initial position;

[0071] S400: Assembling the first beam segment (LB1), the tower beam segment (H2), the second beam segment (LA1), the third beam segment (LA2) and the fourth beam segment (LB2) to form a beam segment as a whole;

[0072] S500: Lift the beam section as a whole and install it by dropping it to form a cable-free beam section in the tower area.

[0073] For ease of understanding, a specific implementation is shown below:

[0074] 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. 3 is a schematic diagram of a top view of the pier side support 300 of the present invention. Figure 2 and Figure 3 As shown:

[0075] F110: A 135t crawler crane is used to install the pier support 300 and ensure the relative position 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.

[0076] In order to ensure the linear shape of the steel beam construction, the bracket needs to have sufficient rigidity, strength and stability, and when the pier side bracket 300 is installed, the elevation error of the top surface of the pier side bracket 300 is less than or equal to 5 mm.

[0077] Reference Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the installation process of the first main longitudinal beam 500 and the second main longitudinal beam 600 of the present invention, as shown in FIG. Figure 4 As shown:

[0078] It can be understood that there are two symmetrically arranged main tower piers 100 on the cross-sea cable-stayed bridge, and the first pier-side bracket 300 and the second pier-side bracket 300 are respectively constructed at the two main tower piers 100, and the first main longitudinal beam 500 and the second main longitudinal beam 600 are respectively constructed at the first pier-side bracket 300 and the second pier-side bracket 300;

[0079] F210: transport LB1 to the trestle next to the pier support 300, i.e., the construction transportation platform, and use a 135t crawler crane to synchronously lift LB1 to the first pier support 300, and use a slider to slide LB1 to connect it to the slideway beam;

[0080] F220: Install LB2 on the second pier side bracket 300, and use a slider to slide LB2 to the slideway beam;

[0081] F230: A 135t crawler crane was used to hoist the relevant transverse and longitudinal beams of segments LB1 and LB2, and a winch 900 was used to drag the entire segment LB1 and the entire segment LB2 to the designed position respectively, completing the installation of LB1 and LB2.

[0082] Reference Figure 5 and Figure 6 , Figure 5 Schematic diagram of the installation process of the first main longitudinal beam 500 of the present invention. Figure 6 FIG. 6 is a schematic diagram of the installation process of the second main longitudinal beam 600 of the present invention, as shown in FIG. Figure 5 and Figure 6 As shown:

[0083] F310: transport the first H2 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 to the first pier support 300, and use a slider to slide the first H2 to the slideway beam;

[0084] 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;

[0085] F330: A 135t crawler crane was used to hoist the relevant transverse and longitudinal beams of the first and second H2 segments, and a winch 900 was used to drag the first and second H2 segments to the designed positions respectively, completing the installation of the first and second H2 segments.

[0086] F410: transport LA1 to the trestle next to the pier support 300, i.e., the construction transportation platform, and use a 135t crawler crane to synchronously lift LA1 to the first pier support 300, and use a slider to slide LA1 to connect it to the slideway beam;

[0087] F420: Install LA2 on the second pier side bracket 300, and use a slider to slide LA2 to the slideway beam;

[0088] F430: A 135t crawler crane was used to hoist the relevant transverse and longitudinal beams of segments LA1 and LA2, and a winch 900 was used to drag the entire segment LA1 and the entire segment LA2 to the designed position respectively, completing the installation of LA1 and LA2.

[0089] Reference Figure 7 , Figure 7 FIG. 1 is a schematic diagram of the installation process of the whole section of the beam to be constructed and dropped according to the present invention, as shown in FIG. Figure 7 As shown:

[0090] 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;

[0091] F520: Crawler crane is used to hoist the longitudinal and transverse beams of LA and LB respectively;

[0092] F530: Perform linear adjustments and beam removal, and remove slideway beams, winch 900 and other towing equipment.

[0093] 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.

[0094] 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:

[0095] 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;

[0096] 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:

[0097] 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;

[0098] F720: The fully revolving crane 800 moves to the top of the installed steel beam, rotates to lift H2 and the steel beam bridge deck, and obtains the cable-free beam section in the tower area.

[0099] F810: Adjust the position of the steel beam before closing, and install the closing section with the full-slewing crane 800;

[0100] F820: Full-slewing crane 800 lifting and closing section bridge deck.

[0101] F910: Full-slewing crane 800 hoists the steel beam bridge deck, and the steel bridge installation is completed;

[0102] F920: At this time, the main tower is completed and the cables are tensioned symmetrically in sequence.

[0103] 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;

[0104] G200: Install the remaining auxiliary structures;

[0105] G300: Final adjustment of cable force, load test, and final acceptance.

[0106] The technical solution of the present invention reduces the difficulty of constructing the cable-free beam section in the tower area of ​​the cross-sea cable-stayed bridge by dividing the cable-free beam section in the tower area into multiple beam sections, and assembles and drags the first beam section, the tower beam section, the second beam section, the third beam section and the fourth beam section on the pier side support 300 on the main pier pedestal 200, thereby being more conducive to controlling the construction period of the cable-free beam section in the tower area and improving the construction efficiency. In addition, when the beam section is divided into multiple beam sections for construction, due to the connection steps between the beam sections, after the beam sections are assembled separately, the quality problem of a part of the beam section is prevented from affecting the construction period of the entire beam section. When a part of the beam section has a quality problem, only the beam section needs to be processed without disassembling the entire beam section, thereby ensuring the construction period.

[0107] In one embodiment, the cross-sea cable-stayed bridge further comprises a plurality of piers. Before the step of assembling the first beam segment (LB1), the mid-tower beam segment (H2) and the second beam segment (LA1) beam by beam segment at the initial position, the method further comprises:

[0108] A100: A main trestle is constructed on one side of the pier along the longitudinal direction of the bridge, and a branch trestle is constructed on one side of the main trestle corresponding to each pier to obtain a construction and transportation platform; wherein the construction and transportation platform has a second preset position, and in the longitudinal direction of the bridge, the second preset position is set between the initial position and the main tower pier 100;

[0109] A200: Lift the first beam section (LB1), the middle beam section (H2) of the tower and the second beam section (LA1) from the second preset position to the initial position.

[0110] In order to provide road transportation conditions for the construction process of each beam section, provide a construction working surface for each beam section, and reduce the overall construction difficulty of the beam section, a main trestle is constructed along the direction of the bridge, and a branch trestle is constructed on one side of the main trestle to obtain a construction and transportation platform. The construction platform is used to transport each beam section and its accessories. The second preset position is determined according to the construction design requirements. The second preset position is used to cooperate with the lifting position of the full-revolving crane 800, that is, the second preset position is the lifting position. The number of the second preset positions is determined according to the actual construction needs. The initial position is the position for assembling each beam section, which is set on the pier side bracket 300. The initial position is also determined according to the construction design requirements.

[0111] In one embodiment, at the initial position, the steps of assembling the first beam segment (LB1), the middle beam segment (H2), and the second beam segment (LA1) beam by beam segment respectively include:

[0112] D100: Weld the anchor lugs on the first beam section (LB1), the tower beam section (H2) and the second beam section (LA1) respectively;

[0113] D200: transport the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) to the second preset position respectively;

[0114] D300: Lift the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) to their initial positions respectively.

[0115] In order to facilitate the towing of each beam section, an anchor lug plate is welded on each beam section to be towed, namely the first beam section (LB1), the middle beam section (H2) in the tower and the second beam section (LA1). After the anchor lug plate is installed, the first beam section (LB1), the middle beam section (H2) in the tower and the second beam section (LA1) are transported to the second preset position and lifted to the initial position, and then installed beam section by beam section.

[0116] In one embodiment, at the initial position, the steps of assembling the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) beam by beam segment respectively include:

[0117] W100: transport the first cross beam and the first small longitudinal beam to the initial position;

[0118] W200: At the initial position, the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) are assembled respectively using the first cross beam and the first small longitudinal beam.

[0119] It can be understood that in order to assemble the first beam section (LB1), the middle beam section (H2) of the tower and the second beam section (LA1), the first cross beam and the first small longitudinal beam are also required. Therefore, after the first cross beam and the first small longitudinal beam are transported to the initial position, the first cross beam and the first small longitudinal beam are used to assemble the first beam section (LB1), the middle beam section (H2) of the tower and the second beam section (LA1) respectively to complete the assembly of the first beam section (LB1), the middle beam section (H2) of the tower and the second beam section (LA1).

[0120] In one embodiment, the step of dragging and translating the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) to the first preset position beam segment by beam segment comprises:

[0121] E100: A winch 900 is installed on the supporting trestle, that is, the winch is installed on the trestle. In order to cooperate with the use of the winch, a pulley assembly is provided on the pier side bracket 300;

[0122] E200: Use steel wire ropes to connect the winch 900 to the anchor lugs on the first beam section (LB1), the tower beam section (H2) and the second beam section (LA1);

[0123] E300: Use the winch 900 to drag the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) to the first preset position respectively.

[0124] In the specific dragging process, first, a temporary pier 700 is constructed on the outside of the pier side support 300, that is, away from the pier side support 300. The elevation of the temporary pier 700 is lower than the elevation of the pier side support 300, and a winch 900 is set on the pier side support 300 group, which is the first preset position in this embodiment. The construction design position on the pier side support 300.

[0125] It is understandable that the winch 900 provided at the first preset position on the pier-side support 300 can also play the role of dragging each beam section.

[0126] In one embodiment, a cross-sea cable-stayed bridge includes a main longitudinal beam, a second transverse beam, and a second small longitudinal beam, and the steps of assembling a first beam segment (LB1), a tower beam segment (H2), a second beam segment (LA1), a third beam segment (LA2), and a fourth beam segment (LB2) to form a beam segment as a whole include:

[0127] T100: transport the main longitudinal beam, the second cross beam and the second small longitudinal beam to the initial position;

[0128] T200: Use the main longitudinal beam, the second cross beam and the second small longitudinal beam in the initial position to assemble the third beam section (LA2) and the fourth beam section (LB2) respectively. The third beam section (LA2), the fourth beam section (LB2), the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) form a beam section as a whole.

[0129] In order to assemble the third beam segment (LA2) and the fourth beam segment (LB2), the main longitudinal beam, the second cross beam and the second small longitudinal beam are transported to the initial position, and the third beam segment (LA2) and the fourth beam segment (LB2) are respectively assembled at the initial position using the main longitudinal beam, the second cross beam and the second small longitudinal beam at the first preset position. The third beam segment (LA2), the fourth beam segment (LB2), the first beam segment (LB1), the middle beam segment (H2) in the tower and the second beam segment (LA1) form a beam segment as a whole.

[0130] In one embodiment, the steps of lifting the beam section as a whole and dropping the beam for installation to form the cable-free beam section in the tower area include:

[0131] I100: Use evenly distributed jacks to lift the first beam section (LB1), the middle beam section (H2), the second beam section (LA1), the third beam section (LA2) and the fourth beam section (LB2);

[0132] I200: Carry out beam drop construction on the entire beam section and debug the entire beam section to make the entire beam section meet the design requirements;

[0133] I300: On the whole beam section that meets the design requirements, the cable beam section and the closed section are cantilevered and assembled, and temporary consolidation construction of the tower beam is carried out to form a cable-free beam section in the tower area.

[0134] In order to ensure the construction line shape of each beam section and make the overall beam section meet the design requirements, after the beam drop construction is carried out on the overall beam section, the overall beam section is debugged, and the rods are cantilevered and assembled on the overall beam section that meets the design requirements, and temporary consolidation construction of the tower beam is carried out to keep the overall structure of the beam section stable and form a cable-free beam section in the tower area.

[0135] In one embodiment, the pier side support 300 is arranged along the bridge direction, and the steps of dragging and translating the first beam segment (LB1), the tower beam segment (H2) and the second beam segment (LA1) to the first preset position one by one include:

[0136] P100: construct the slideway assembly on the pier side support 300 to form a towing platform;

[0137] P200: Use the towing platform to drag and translate the first beam segment (LB1), the middle beam segment (H2) and the second beam segment (LA1) to the first preset position one by one.

[0138] In order to simplify the overall construction process of the beam segment, a slideway assembly is constructed on the pier side support 300 to form a towing platform, and the towing platform is used to drag and translate the first beam segment (LB1), the tower beam segment (H2) and the second beam segment (LA1) to the first preset position one by one.

[0139] In one embodiment, the slideway assembly includes a slideway beam and a slider, and the steps of constructing the slideway assembly on the pier side bracket 300 to form a towing platform include:

[0140] X100: Install the slideway beam on the pier side bracket 300 along the bridge direction to form a towing platform;

[0141] X200: Slide blocks are installed at positions corresponding to the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) and the towing platform, so that the first beam section (LB1), the middle beam section (H2) and the second beam section (LA1) are slidably connected to the slideway beam respectively.

[0142] When dragging the first beam segment (LB1), the middle beam segment (H2) in the tower and the second beam segment (LA1), sliders are installed at the positions of the first beam segment (LB1), the middle beam segment (H2) in the tower and the second beam segment (LA1) corresponding to the dragging platform, and the winch 900 is used to drag the first beam segment (LB1), the middle beam segment (H2) in the tower and the second beam segment (LA1) to the positions required by the design, respectively, to provide dragging conditions for each beam segment.

[0143] In this embodiment, a plurality of beam-dropping jacks are evenly arranged on the lower cross beam of the main tower pier and the top of the bracket beside the pier. Specifically, the beam-dropping jacks are located at the lower cross beam of the lower tower column and the top of the bracket beside the pier. The steps of performing beam-dropping construction on the entire beam section and debugging the entire beam section so that the entire beam section meets the design requirements include:

[0144] C100: Use multiple beam-dropping jacks to simultaneously lift the first beam section (LB1), the tower beam section (H2), the second beam section (LA1), the third beam section (LA2) and the fourth beam section (LB2) so that the beam sections are lifted as a whole;

[0145] C200: Remove the slider and slideway beam to form a complete section of the beam to be dropped;

[0146] C300: Install spacers on the cross beam under the main tower pier and on the top of the bracket beside the pier corresponding to the entire section of the beam to be dropped, so that the entire beam section meets the design requirements, forming an entire beam section that meets the design requirements.

[0147] When adjusting the overall linear shape of the beam section, pads are used to adjust the elevation information of each beam section one by one, making the overall linear adjustment of the beam section more convenient, so that the overall beam section meets the design requirements, forming an overall beam section that meets the design requirements.

[0148] 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 cable-free beam section in the tower area of ​​a cross-sea cable-stayed bridge, characterized in that: The cross-sea cable-stayed bridge comprises a main tower pier, a pier-side bracket and a plurality of bridge piers, wherein the pier-side bracket has an initial position, and the construction method of the cable-free beam section of the tower area of ​​the cross-sea cable-stayed bridge comprises: A main trestle is constructed on one side of the pier along the longitudinal direction of the bridge, and a branch trestle is constructed on one side of the main trestle corresponding to each pier to obtain a construction and transportation platform; wherein the construction and transportation platform has a second preset position, and in the longitudinal direction of the bridge, the second preset position is set between the initial position and the main tower pier; Lifting the first beam section, the middle beam section of the tower, and the second beam section from the second preset position to the initial position; wherein the second preset position is a lifting position for cooperating with a full-revolving crane; At the initial position, assembling the first beam segment, the middle beam segment and the second beam segment segment by segment; Drag and translate the first beam segment, the beam segment in the tower, and the second beam segment to a first preset position, beam segment by beam segment; wherein the first preset position is located at the support beside the pier; At the initial position, assembling the third beam segment and the fourth beam segment; Assembling the first beam segment, the middle beam segment, the second beam segment, the third beam segment and the fourth beam segment to form a beam segment as a whole; Lifting the beam section as a whole, and dropping the beam for installation, to form the cable-free beam section of the tower area; Wherein, the step of assembling the first beam segment, the middle beam segment of the tower and the second beam segment segment by segment at the initial position comprises: transporting the first cross beam and the first small longitudinal beam to the initial position; at the initial position, assembling the first beam segment, the middle beam segment of the tower and the second beam segment by segment using the first cross beam and the first small longitudinal beam; The cross-sea cable-stayed bridge comprises a main longitudinal beam, a second transverse beam and a second small longitudinal beam. The step of assembling the first beam section, the beam section in the tower, the second beam section, the third beam section and the fourth beam section to form an integral beam section comprises: transporting the main longitudinal beam, the second transverse beam and the second small longitudinal beam to an initial position; assembling the third beam section and the fourth beam section respectively at the initial position using the main longitudinal beam, the second transverse beam and the second small longitudinal beam, so that the third beam section, the fourth beam section, the first beam section, the beam section in the tower and the second beam section form an integral beam section.

2. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 1, characterized in that: The step of assembling the first beam segment, the middle beam segment, and the second beam segment segment by segment at the initial position comprises: Welding anchor lugs on the first beam section, the middle beam section of the tower and the second beam section respectively; transporting the first beam section, the mid-tower beam section and the second beam section to a second preset position respectively; The first beam section, the mid-tower beam section and the second beam section are respectively lifted to the initial positions.

3. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 1, characterized in that: The step of dragging and translating the first beam segment, the beam segment in the tower, and the second beam segment to a first preset position beam segment by beam segment comprises: Installing a winch on the supporting trestle; The winch is connected to the anchor lugs on the first beam section, the tower beam section and the second beam section respectively by using steel wire ropes; The winch is used to drag the first beam section, the mid-tower beam section and the second beam section to a first preset position respectively.

4. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 1, characterized in that: The step of lifting the beam section as a whole and dropping the beam for installation to form the cable-free beam section of the tower area includes: The first beam section, the middle beam section of the tower, the second beam section, the third beam section and the fourth beam section are lifted by jacks evenly distributed in sections; Performing beam dropping construction on the entire beam section and debugging the entire beam section so that the entire beam section meets the design requirements; The cable beam section and the closed section rods are cantilevered and assembled on the whole beam section that meets the design requirements, and temporary consolidation construction of the tower beam is carried out to form the cable-free beam section in the tower area.

5. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 4, characterized in that: The pier-side supports are arranged along the bridge direction, and the step of dragging and translating the first beam segment, the tower beam segment and the second beam segment to a first preset position beam segment by beam segment comprises: constructing a slideway assembly on the pier-side bracket to form a towing platform; The towing platform is used to tow and translate the first beam segment, the middle beam segment of the tower and the second beam segment to a first preset position one by one.

6. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 5, characterized in that: The slideway assembly includes a slideway beam and a slider, and the steps of constructing the slideway assembly on the pier side bracket to form a towing platform include: Installing the slideway beam on the pier-side bracket along the longitudinal direction of the bridge to form a towing platform; Slide blocks are installed at positions of the first beam section, the beam section in the tower and the second beam section corresponding to the towing platform, so that the first beam section, the beam section in the tower and the second beam section are slidably connected to the slideway beam respectively.

7. The method for constructing a cable-free beam section in the tower area of ​​a sea-crossing cable-stayed bridge according to claim 6, characterized in that: A plurality of beam-dropping jacks are evenly arranged on the top of the cross beam under the main tower pier and the bracket beside the pier. The steps of performing beam-dropping construction on the entire beam section and debugging the entire beam section so that the entire beam section meets the design requirements include: Using a plurality of the beam-dropping jacks to simultaneously lift the first beam section, the beam section in the tower, the second beam section, the third beam section and the fourth beam section, so that the beam sections are lifted as a whole; Remove the slider and the slideway beam to form a complete section of the beam to be dropped; Pads are installed respectively on the cross beam under the main tower pier, the top of the pier side bracket and the corresponding positions of the entire section of the beam to be dropped, so that the entire beam section meets the design requirements, forming the entire beam section that meets the design requirements.

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