Main tower structure of sea-crossing bridge and its construction method

Abstract

The present invention discloses a main tower structure of a cross-sea bridge and a construction method thereof, and belongs to the technical field of cross-sea bridge engineering. The main tower structure of the cross-sea bridge includes: a tower base; a near pier section, the near pier section is arranged on the tower base, the near pier section is gradually expanded in the direction away from the tower base, and the near pier section is provided with a first recessed portion on the opposite side walls along the bridge upward; and a far pier section, the far pier section is arranged on the side of the near pier section away from the tower base, the far pier section is gradually contracted in the direction from the tower base to the near pier section, and the far pier section is provided with a second recessed portion on the opposite side walls along the bridge upward. The present invention reduces the construction difficulty by arranging the main tower structure of the cross-sea bridge into three parts, namely the tower base, the near pier section and the far pier section, which are constructed sequentially, and is more conducive to continuous construction, while ensuring the construction quality and improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sea-crossing bridge engineering, and in particular to a main tower structure of a sea-crossing bridge and a construction method thereof. Background Art

[0002] In the related art, the main tower of a cross-sea 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 towers are arranged in single column, A shape and inverted Y shape along the longitudinal direction of the bridge, and in single column, double column, portal, inclined leg portal, inverted V shape, inverted Y shape and A shape along the transverse direction of the bridge.

[0003] Plane towers are commonly used, while space cable towers and large-angle space gem-shaped complex linear cable towers are not commonly used. The construction of large-angle space gem-shaped complex linear cable towers is extremely difficult, and conventional construction methods cannot meet the construction needs of large-angle space gem-shaped complex linear cable towers. Summary of the invention

[0004] The main purpose of the present invention is to provide a main tower structure of a cross-sea bridge and a construction method thereof, aiming to solve the technical problems of low construction efficiency and great construction difficulty of large-angle spatial gem-shaped complex linear cable towers in the prior art.

[0005] To achieve the above-mentioned purpose, according to a first aspect of an embodiment of the present disclosure, the present invention proposes a main tower structure of a cross-sea bridge, comprising:

[0006] Tower base;

[0007] A near pier section, the near pier section is arranged at the tower base, the near pier section is gradually expanded in a direction away from the tower base, and the near pier section is provided with a first recessed portion on opposite side walls upward along the bridge; and

[0008] A far pier section is arranged on a side of the near pier section away from the tower base, the far pier section is gradually tapered in the direction from the tower base to the near pier section, and the far pier section is provided with second recessed portions on opposite side walls upward along the bridge.

[0009] Optionally, a connection between the near pier section and the far pier section has an arc-shaped portion protruding outward.

[0010] Optionally, the main tower structure of the cross-sea bridge includes: a decorative component, which is arranged at an end of the far pier section away from the tower base.

[0011] Optionally, a wind-resistant support is provided at the connection between the near pier section and the far pier section.

[0012] Optionally, the near-pier section includes:

[0013] A lower tower column, one end of which is connected to the tower base, and in the direction from the tower base to the near pier section, the other end of which is inclined and extends in a direction away from the central axis of the tower base.

[0014] Optionally, the near-pier section includes: two webs, the webs are arranged on the side walls of the second recessed portion, the webs extend along the transverse direction, and the two webs are spaced apart from each other and arranged opposite to each other in the longitudinal direction.

[0015] Optionally, the distal pier section comprises:

[0016] a middle tower column, one end of which is connected to an end of the lower tower column away from the tower base, and the other end of which is inclined and extends toward the center axis of the tower base in the direction from the tower base to the near pier section, and a plurality of vents are formed on the middle tower column, and the plurality of vents are sequentially spaced apart along the longitudinal bridge direction;

[0017] An upper tower column, one end of which is arranged on the middle tower column, the upper tower column is adapted to the middle tower column, and in the direction from the tower base to the near pier section, the other end of the upper tower column extends in the direction close to the central axis of the tower base, a first cross beam is arranged at the connection between the upper tower column and the middle tower column, and a second cross beam is arranged along the transverse bridge direction at one end of the upper tower column away from the tower base;

[0018] Wherein, a third cross beam is arranged at the connection between the middle tower column and the lower tower column.

[0019] Optionally, the upper tower column is a single-box single-chamber hollow box-shaped cross-section structure, and a steel anchor box is provided in the upper tower column;

[0020] The middle tower column is a single-box single-chamber hollow box-shaped cross-section structure; and / or

[0021] The lower tower column is a single-box double-chamber hollow box cross-section structure.

[0022] According to a second aspect of the disclosed embodiment, the present invention further provides a construction method for a main tower structure of a cross-sea bridge, comprising:

[0023] forming a tower base;

[0024] Constructing a near-pier section on the tower base, wherein the near-pier section is gradually expanded in a direction away from the tower base;

[0025] Disposing first recessed portions on opposite sides of the near-pier section;

[0026] A far pier section is constructed on a side of the near pier section away from the tower base, and the far pier section is arranged to be gradually reduced in a direction from the tower base to the near pier section;

[0027] A second recessed portion is provided on the opposite side walls of the distal pier section.

[0028] Optionally, while the far pier section is being constructed, the composite beam is being constructed simultaneously, and the method includes:

[0029] Setting up pier-side supports on the tower base;

[0030] A temporary pier is arranged outside the support beside the pier;

[0031] The composite beam is constructed using the temporary pier.

[0032] The technical solution of the present invention reduces the difficulty of construction by arranging the main tower structure of the cross-sea bridge into three parts: a tower base, a near pier section and a far pier section which are constructed in sequence. The cable tower is divided into three sections, forming a near pier section which is gradually expanded in the direction away from the tower base, and a far pier section which is gradually contracted in the direction from the tower base to the near pier section. The near pier section and the far pier section match the large inclination angle of the cable tower, which is more conducive to continuous construction, ensures construction quality and improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 It is a schematic diagram of the transverse structure of the main tower structure of the sea-crossing bridge of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure in the direction of the bridge of the main tower structure of the sea-crossing bridge of the present invention;

[0036] Figure 3 is a schematic diagram of the first recessed portion and the second recessed portion of the present invention;

[0037] Figure 4 The figure is a schematic flow chart of the construction method of the main tower structure of the sea-crossing bridge according to the present invention.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] 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

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In the related art, the main tower of a cross-sea 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 towers are arranged in single column, A shape and inverted Y shape along the longitudinal direction of the bridge, and in single column, double column, portal, inclined leg portal, inverted V shape, inverted Y shape and A shape along the transverse direction of the bridge.

[0047] Plane towers are commonly used, while space cable towers and large-angle space gem-shaped complex linear cable towers are not commonly used. The construction of large-angle space gem-shaped complex linear cable towers is extremely difficult, and conventional construction methods cannot meet the construction needs of large-angle space gem-shaped complex linear cable towers.

[0048] To this end, the present invention provides a main tower structure of a cross-sea bridge and a construction method thereof. The main tower structure of the cross-sea bridge is arranged to be constructed in sequence as a tower base 100, a near pier section and a far pier section 300 to reduce the difficulty of construction and facilitate continuous construction. When the construction of the near pier section is completed, synchronous construction measures for the middle tower column, the upper tower column and the composite beam can be started simultaneously, so as to facilitate the construction of the composite beam (steel beam), thereby ensuring the construction quality and improving the construction efficiency.

[0049] The concept of the present invention is further described below in conjunction with some specific embodiments.

[0050] The invention provides a main tower structure of a sea-crossing bridge.

[0051] Reference Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a schematic diagram of the transverse structure of the main tower structure of the sea-crossing bridge of the present invention; Figure 2 It is a schematic diagram of the structure in the direction of the bridge of the main tower structure of the sea-crossing bridge of the present invention; Figure 3 Schematic diagram of the first recessed portion 201 and the second recessed portion 301 of the present invention.

[0052] In one embodiment of the present invention, Figure 1 , Figure 2 and Figure 3 As shown, the main tower structure of the cross-sea bridge includes:

[0053] Tower base 100;

[0054] A near pier section 200, which is disposed on the tower base 100, and is gradually expanded in a direction away from the tower base 100, and the near pier section 200 is provided with first recessed portions 201 on opposite side walls of the near pier section 200 upward along the bridge; and

[0055] The far pier section 300 is arranged on a side of the near pier section 200 away from the tower base 100. The far pier section 300 is gradually tapered in the direction from the tower base 100 to the near pier section 200. The far pier section 300 is provided with second recessed portions 301 on opposite side walls along the bridge.

[0056] In order to simplify the construction difficulty of the main tower structure of the cross-sea bridge (a large-angle space gem-shaped complex linear cable tower) and improve the construction efficiency, the main tower structure of the cross-sea bridge is divided into three parts for continuous construction. For ease of understanding, a specific implementation method is shown here;

[0057] The main tower structure of the cross-sea bridge adopts concrete bridge tower and the main beam is steel-concrete composite beam.

[0058] The main bridge adopts a semi-floating system. The main beam is equipped with two-way movable bearings on the cross beams on both sides of the bridge tower, auxiliary piers, and side span intersection piers, and counterweights are set in some areas of the side spans.

[0059] The cable-stayed structure is double-cable and arranged in a fan-shaped pattern, with 20 pairs of cables in the main span and 10 pairs of cables in the side span, for a total of 80 cables in the entire bridge.

[0060] The main tower structure of this bridge adopts an improved gem-shaped tower in the transverse direction. Specifically:

[0061] In the transverse direction of the bridge, the near pier section 200 is arranged on the tower base 100, and the near pier section 200 is gradually expanded in the direction away from the tower base 100, and the near pier section 200 is provided with a first recessed portion 201 on the opposite side walls upward along the bridge.

[0062] The structure corresponding to the first recessed portion 201 is that, in the direction along the bridge, the pier section 200 is also gradually expanded in a direction away from the tower base 100 .

[0063] In terms of the overall appearance of the main tower structure, a first accommodating space corresponding to the first recessed portion 201 is formed on the near pier section 200. The first accommodating space has four openings that are spaced apart from each other and evenly distributed along the periphery of the main tower. The four openings are interconnected through the first accommodating space. The four openings include a first opening, a second opening, a third opening and a fourth opening. The first opening and the second opening are arranged opposite to each other upward on the transverse bridge, and the third opening and the fourth opening are arranged opposite to each other on the longitudinal bridge.

[0064] In the transverse direction of the bridge, the far pier section 300 is arranged on the side of the near pier section 200 away from the tower base 100, and the far pier section 300 is gradually arranged in the direction from the tower base 100 to the near pier section 200. The far pier section 300 is provided with a second recessed portion 301 on the opposite side walls upward along the bridge.

[0065] The far pier section 300 transitions from a single tower column at the top to two towers along the bridge, using concrete towers. The standard cable length of the cable on the main span beam is 10m, the cable length on the anchor span beam is 7.5m, and the vertical cable length on the tower is 2.3m to 0.6m.

[0066] This bridge adopts a "jewel-shaped" bridge tower. The upper tower column in the cable area is expanded 320 degrees, and a double cable surface arrangement is adopted. The shape is taken from the shape of a copper phoenix lantern. The overall effect of the cable tower is stable and generous. The structure adopts the tower and pier consolidation method.

[0067] The main tower is a reinforced concrete structure with a box-shaped hollow section. The tower changes from a single limb to two limbs below the cable area along the bridge. Two cross beams are set along the bridge near the bridge deck and two cross beams are set above the bridge deck. The top of the tower is equipped with a steel tower section that meets the needs of the shape, which adopts a curved form. The cable tower anchor adopts a steel anchor box structure.

[0068] The bridge tower adopts a main tower structure similar to the "jewel type" and uses marine high-performance C50 concrete. The total height of the concrete cable tower is 84.5m, of which the tower height above the bridge deck is 61.05m and the height below the bridge deck is 23.95m.

[0069] The technical solution of the present invention reduces the difficulty of construction by arranging the main tower structure of the cross-sea bridge into three parts, namely, a tower base 100, a near pier section 200 and a far pier section 300, which are constructed in sequence. The cable tower is divided into three sections, forming a near pier section 200 which is gradually expanded in the direction away from the tower base 100, and a far pier section 300 which is gradually contracted in the direction from the tower base 100 to the near pier section. The near pier section 200 and the far pier section 300 match the large inclination angle of the cable tower, which is more conducive to continuous construction, ensures construction quality and improves construction efficiency.

[0070] In this embodiment, the connection between the near pier section 200 and the far pier section 300 has an arc-shaped portion 400 protruding outward.

[0071] In order to match the curvature of the near pier section 200 and the far pier section 300 so as to make the transition between the near pier section 200 and the far pier section 300 smoother, the connection between the near pier section 200 and the far pier section 300 has an outwardly protruding arc portion 400 .

[0072] In this embodiment, the main tower structure of the cross-sea bridge includes: a decorative component (not shown in the figure), which is arranged at an end of the far pier section 300 away from the tower base 100.

[0073] In order to make the main tower structure multifunctional, that is, ornamental and iconic, a decorative piece is provided at one end of the far pier section 300 away from the tower base 100 .

[0074] In this embodiment, a wind-resistant support 500 is provided at the connection between the near pier section 200 and the far pier section 300 .

[0075] In order to improve the wind resistance of the main beam (composite beam) and the main tower structure as a whole, a wind-resistant support 500 is provided at the connection between the near pier section 200 and the far pier section 300 .

[0076] In one embodiment, the near pier section 200 includes:

[0077] The lower tower column 210 has one end connected to the tower base 100 , and the other end of the lower tower column 210 extends obliquely in a direction away from the central axis of the tower base 100 in a direction from the tower base 100 to the proximal pier section 200 .

[0078] For ease of understanding, a specific embodiment is shown here:

[0079] Two tower limbs are arranged at the front and rear of the lower tower column 210, and the lower tower columns 210 corresponding to the front and rear tower limbs are distributed in a rectangular shape on one side of the tower base 100, that is, the end of each lower tower column 210 close to the tower base 100 is spaced apart from each other, and in the transverse direction, the other end of each lower tower column 210 (the end away from the tower base 100) extends obliquely in the direction away from the central axis of the tower base 100, and at the same time, in the longitudinal direction, the other end of each lower tower column 210 (the end away from the tower base 100) extends obliquely in the direction away from the central axis of the tower base 100.

[0080] In this embodiment, the proximal pier section 200 includes: two webs 220, the webs 220 are arranged on the side walls of the second recessed portion 301, the webs 220 extend in the transverse direction, and the two webs 220 are spaced apart from each other and arranged opposite to each other in the longitudinal direction.

[0081] In order to ensure the overall structural strength of the near-pier section 200 , webs 220 are provided on both sides, and the webs 220 extend in the transverse direction of the bridge.

[0082] In this embodiment, the distal pier section 300 includes:

[0083] A middle tower column 310, one end of which is connected to an end of the lower tower column 210 away from the tower base 100, and the other end of which is inclined and extends toward the central axis of the tower base 100 in the direction from the tower base 100 to the pier section 200, and a plurality of vents 900 are formed on the middle tower column 310, and the plurality of vents 900 are sequentially spaced apart along the longitudinal bridge direction; and

[0084] An upper tower column 320, one end of which is arranged on the middle tower column 310, the upper tower column 320 is adapted to the middle tower column 310, and in the direction from the tower base 100 to the near pier section 200, the other end of the upper tower column 320 extends in the direction close to the central axis of the tower base 100, a first cross beam 600 is arranged at the connection between the upper tower column 320 and the middle tower column 310, and a second cross beam 700 is arranged along the transverse bridge direction at one end of the upper tower column 320 away from the tower base 100;

[0085] A third cross beam 800 is provided at the connection between the middle tower column 310 and the lower tower column 210 .

[0086] For ease of understanding, a specific embodiment is shown here:

[0087] The middle tower column 310 is provided with four tower limbs, and the middle tower column 310 is arranged one-to-one corresponding to the lower tower column 210. The end of each middle tower column 310 close to the tower base 100 is spaced apart from each other. In the transverse direction, the other end of each middle tower column 310 (the end away from the tower base 100) is inclined and extends in a direction away from the central axis of the tower base 100. At the same time, in the longitudinal direction, the other end of each middle tower column 310 (the end away from the tower base 100) is inclined and extends in a direction away from the central axis of the tower base 100.

[0088] Two tower limbs are arranged on the left and right of the upper tower column 320. The upper tower column 320 is arranged one-to-one with the middle tower column 310. The end of each upper tower column 320 close to the tower base 100 is spaced apart from each other. In the transverse direction, the other end of each upper tower column 320 (the end away from the tower base 100) extends obliquely in the direction away from the central axis of the tower base 100. At the same time, in the longitudinal direction, the other end of each upper tower column 320 (the end away from the tower base 100) extends obliquely in the direction away from the central axis of the tower base 100.

[0089] In order to ensure the stability of the structures of the upper tower column 320, the middle tower column 310 and the lower tower column 210, a first cross beam 600 is provided at the connection between the upper tower column 320 and the middle tower column 310, and a second cross beam 700 is provided along the transverse direction at the end of the upper tower column 320 away from the tower base 100, wherein a third cross beam 800 is provided at the connection between the middle tower column 310 and the lower tower column 210.

[0090] In this embodiment, the upper tower column 320 is a single-box single-chamber hollow box-shaped cross-section structure, and a steel anchor box is provided in the upper tower column 320;

[0091] The middle tower column 310 is a single-box single-chamber hollow box cross-section structure; and / or

[0092] The lower tower column 210 is a single-box double-chamber hollow box cross-section structure.

[0093] For ease of understanding, a specific embodiment is shown here:

[0094] For the convenience of construction, the upper tower column 320 adopts a hollow box section, with a single box and a single chamber. There are two upper tower columns 320 in the transverse direction, and the lower tower column in the cable area along the bridge changes from a single limb to two limbs. The tower column size in the cable section changes from 8.774x4m to 7.4x4m, in which the longitudinal direction is inclined, and the transverse direction adopts a curve with a radius of 102.1m for transition, and a steel anchor box is set in the tower column.

[0095] The middle tower column 310 and the lower tower column 210 are divided into two limbs in the longitudinal direction of the bridge. Each limb adopts a hollow box section. The middle tower column 310 is a single-box single-chamber, and the lower tower column 210 is a single-box double-chamber. A 2.5m web 220 is arranged in the middle, similar to the wall pier form, and the tower base 100 is retracted inward from the transverse bridge.

[0096] In addition, the present invention also proposes a construction method for the main tower structure of a cross-sea bridge.

[0097] Reference Figure 4 , Figure 4 The figure is a schematic flow chart of the construction method of the main tower structure of the sea-crossing bridge according to the present invention.

[0098] In one embodiment of the present invention, Figure 4 As shown, the construction method of the main tower structure of the cross-sea bridge includes:

[0099] S100: forming a tower base 100;

[0100] S200: constructing a near-pier section 200 on the tower base 100, wherein the near-pier section 200 is gradually expanded in a direction away from the tower base 100;

[0101] S300: first recessed portions 201 are provided on opposite sides of the proximal pier section 200;

[0102] S400: constructing a far pier section 300 on a side of the near pier section 200 away from the tower base 100, wherein the far pier section 300 is gradually reduced in a direction from the tower base 100 to the near pier section 200;

[0103] S500 : a second recessed portion 301 is provided on the opposite side wall of the distal pier section 300 .

[0104] In one embodiment, while the far pier section 300 is being constructed, the composite beam is also being constructed simultaneously, and the method includes:

[0105] A100: erect pier-side supports on tower base 100;

[0106] A200: Temporary piers are set up on both sides of the support beside the pier;

[0107] A300: Use temporary piers to construct steel-concrete composite beams.

[0108] For ease of understanding, a specific implementation is shown here:

[0109] Side span and middle span steel beam assembly stage: The sections after the second section of the middle tower column 310 are constructed simultaneously with the steel beams. In order to ensure the continuity of the construction of the tower area beam section and the subsequent beam sections and controllable construction period, the steel beams are constructed in accordance with the consideration that the main tower has not been completed and the conditions for hanging cables are not met. Temporary piers are symmetrically erected along the bridge in addition to the pier-side brackets, and the full-revolving crane is used to assist in the erection of steel beams by using the strength and stiffness of the tall steel beam sections. The bridge deck lags behind the steel beam construction, and the cycle operation is carried out until the side span construction is completed or the span is closed. At this time, the tower base 100 and the middle tower column 310 sections have been cast, and the main beam steel beam sections have been mass-produced. The conditions for the construction of the main beam are met for the 100 pier-side brackets on the tower base, the widened and strengthened trestle on both sides of the bridge, and the temporary piers in the water.

[0110] The present invention reduces the difficulty of construction by arranging the main tower structure of the cross-sea bridge into three parts, namely the tower base 100, the near pier section 200 and the far pier section 300, which are constructed in sequence, and is more conducive to continuous construction. When the construction of the near pier section 200 is completed, the synchronous construction measures of the middle tower column 310, the upper tower column 320 and the composite beam can be started simultaneously, so as to facilitate the construction of the composite beam (steel beam), ensure the construction quality and improve the construction efficiency.

[0111] In addition, in this embodiment, the specific structure of the main tower structure of the cross-sea bridge refers to the above-mentioned embodiment. Since the construction method of the main tower structure of the cross-sea bridge adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0112] 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 construction method for a main tower structure of a sea-crossing bridge, characterized in that: The main tower structure of the cross-sea bridge includes a tower base, a near pier section and a far pier section; the near pier section is arranged on the tower base, the near pier section is gradually expanded in the direction away from the tower base, and the near pier section is provided with a first recessed portion on opposite side walls along the bridge upward; the near pier section includes a lower tower column and two webs, one end of the lower tower column is connected to the tower base, and in the direction from the tower base to the near pier section, the other end of the lower tower column extends obliquely in the direction away from the central axis of the tower base; the web is arranged on the side wall of the first recessed portion, the web extends in the transverse direction of the bridge, and the two webs are spaced apart from each other and arranged oppositely in the direction along the bridge; the far pier section is arranged on a side of the near pier section away from the tower base, the far pier section is gradually contracted in the direction from the tower base to the near pier section, and the far pier section is provided with a second recessed portion on opposite side walls along the bridge upward; the far pier section includes a middle tower column and The top tower column has one end connected to one end of the middle tower column away from the tower base, and the other end of the middle tower column is inclined to extend in the direction close to the central axis of the tower base in the direction from the tower base to the near pier section, and one end of the upper tower column is arranged on the middle tower column, and the upper tower column is adapted to the middle tower column, and in the direction from the tower base to the near pier section, the other end of the upper tower column extends in the direction close to the central axis of the tower base, and a first cross beam is arranged at the connection between the upper tower column and the middle tower column, and a second cross beam is arranged along the transverse bridge direction at the end of the upper tower column away from the tower base, and a third cross beam is arranged at the connection between the middle tower column and the lower tower column; wherein, a pier-side bracket is erected on the tower base, and temporary piers are symmetrically erected along the bridge direction outside the pier-side bracket, and the temporary piers are used to simultaneously carry out the construction of the middle tower column, the upper tower column and the composite beam when the construction of the near pier section is completed; The construction method of the main tower structure of the sea-crossing bridge comprises: Forming the tower base, setting up the pier-side bracket on the tower base, setting up the temporary pier outside the pier-side bracket, and constructing the composite beam using the temporary pier; The near-pier section is constructed on the tower base; the near-pier section is gradually expanded in a direction away from the tower base; The first recessed portions are provided on opposite sides of the proximal pier section; The far pier section is constructed on a side of the near pier section away from the tower base; the far pier section is arranged to be gradually reduced in the direction from the tower base to the near pier section; The second recessed portions are provided on opposite side walls of the distal pier section.

2. The construction method of the main tower structure of a cross-sea bridge according to claim 1, characterized in that: The connection between the near pier section and the far pier section has an arc-shaped portion protruding outwards.

3. The construction method of the main tower structure of a sea-crossing bridge according to claim 1, characterized in that: include: A decorative piece is arranged at an end of the far pier section away from the tower base.

4. The construction method of the main tower structure of a sea-crossing bridge according to claim 1, characterized in that: A wind-resistant support is provided at the connection between the near pier section and the far pier section.

5. The construction method of the main tower structure of a sea-crossing bridge according to any one of claims 1 to 4, characterized in that: A plurality of ventilation holes are formed on the middle tower column, and the plurality of ventilation holes are spaced apart in sequence along the longitudinal bridge direction.

6. The construction method of the main tower structure of a sea-crossing bridge as claimed in claim 5, characterized in that: The upper tower column is a single-box single-chamber hollow box-shaped cross-section structure, and a steel anchor box is arranged inside the upper tower column; The middle tower column is a single-box single-chamber hollow box-shaped cross-section structure; and / or The lower tower column is a single-box double-chamber hollow box cross-section structure.

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