阅读说明：本技术 一种适用于公铁两用斜拉悬吊协作体系桥的施工方法 (Construction method suitable for highway and railway dual-purpose cable-stayed suspension cooperative system bridge ) 是由 李旭 姚森 徐启利 张爱花 赵鹍鹏 何明辉 方柯 张旭 黄海超 于 2021-09-22 设计创作，主要内容包括：本申请涉及一种适用于公铁两用斜拉悬吊协作体系桥的施工方法,涉及桥梁施工技术领域,其包括以下步骤：在主塔下横梁上安装首节边跨节段,并在主塔下横梁上同步施工上塔柱；吊装待架设边跨节段,并与首节边跨节段连接；顶推已架设边跨节段,以使其朝边跨侧移动预设距离；重复吊装和顶推,直至首节边跨节段移动至边墩上,以完成边跨梁段的架设；完成上塔柱的施工后,吊装斜拉区梁段,将其与边跨梁段连接；并同步架设主缆；完成悬吊区梁段和交叉区梁段的吊装,并将交叉区梁段与斜拉区梁段合龙,以形成斜拉悬吊协作体系桥。本申请的边跨梁段的架设与主塔的施工可同步进行,不需要等主塔施工完成后再施工边跨梁段,塔梁同步施工节约关键线路工期。(The application relates to a construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperation system bridge, which relates to the technical field of bridge construction and comprises the following steps: installing a first-section side span section on a lower cross beam of the main tower, and synchronously constructing an upper tower column on the lower cross beam of the main tower; hoisting the side span segment to be erected and connecting the side span segment to the first segment; pushing the erected side span segment to move the erected side span segment towards the side span side for a preset distance; repeating hoisting and pushing until the first section of the side span segment moves to the side pier so as to finish the erection of the side span beam segment; after the construction of the upper tower column is completed, hoisting the beam section of the cable-stayed area, and connecting the beam section with the side span beam section; and synchronously erecting a main cable; and completing the hoisting of the suspension area beam section and the cross area beam section, and closing the cross area beam section and the cable-stayed area beam section to form the cable-stayed suspension cooperation system bridge. The erection of the side span beam section and the construction of the main tower can be synchronously carried out, the side span beam section does not need to be constructed after the construction of the main tower is finished, and the construction period of a key line is saved due to the synchronous construction of the tower beams.)

1. A construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperative system bridge is characterized by comprising the following steps of:

installing a first-section side span section (20) on a main tower lower cross beam (1), and synchronously constructing an upper tower column (3) on the main tower lower cross beam (1);

hoisting the side span segment (21) to be erected and connecting the side span segment with the first section (20) to form an erected side span segment;

pushing the erected side span segment to move towards the side span side for a preset distance;

repeatedly hoisting the side span segment (21) to be erected and pushing the erected side span segment until the first section side span segment (20) moves to the side pier (4), and stopping pushing to finish the erection of the side span beam segment (2);

after the construction of the upper tower column (3) is completed, hoisting the beam section (5) of the cable-stayed region, and connecting the beam section with the side span beam section (2); and synchronously erecting a main cable (6);

and completing the hoisting of the suspension area beam section (8) and the cross area beam section (7), and closing the cross area beam section (7) and the cable-stayed area beam section (5) to form a cable-stayed suspension cooperation system bridge.

2. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge is characterized in that the head-section side span segment (20) comprises a guide beam (200) and a head-section room (201) which are connected with each other, and the guide beam (200) is arranged close to the side span side.

3. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge as claimed in claim 1, wherein the construction method comprises the following steps:

after a first-section side span section (20) is installed on a lower cross beam (1) of a main tower, a beam erecting crane (9) is installed on the first-section side span section (20), and the side span section (21) to be erected is hoisted through the beam erecting crane (9);

and pushing the first section of the side span section (20) to move the first section of the side span section towards the side span side for a preset distance, and then moving the beam erecting crane (9) towards the middle span side for the preset distance.

4. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge is characterized in that two girder erection cranes (9) are arranged, the two girder erection cranes (9) are respectively used for erecting side-span girder sections (2) on two sides and installing the girder sections (5) in a cable-stayed area, and the two girder erection cranes (9) respectively erect the girder sections from the side piers towards the main span-midspan direction.

5. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge is characterized in that the section-by-section construction of the upper tower column (3) is synchronously carried out in the erection process of the side span beam section (2).

6. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge as claimed in claim 1, wherein the construction method comprises the following steps:

constructing an anchorage (10) while constructing the upper tower column (3);

hoisting the diagonal-pulling area beam section (5) and connecting the beam section with the side span beam section (2); and synchronously erecting a main cable (6), and specifically comprises the following steps:

after the construction of the upper tower column (3) and the anchorages (10) is finished, catwalks are installed between the two anchorages (10) and at the top of the upper tower column (3);

main cables (6) are erected above the catwalk, meanwhile, oblique-pulling zone beam sections (5) are erected below the catwalk, and the oblique-pulling zone beam sections (5) and the tensioning stay cables are pulled between the upper tower columns (3).

7. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge, according to claim 1, is characterized in that the hoisting of the suspension zone beam section (8) and the crossing zone beam section (7) is completed, and the construction method specifically comprises the following steps:

installing a cable crane (12) on the main cable (6);

and assembling the suspension zone beam sections (8) and the cross zone beam sections (7) through the cable crane (12) from the midspan to the side span.

8. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge as claimed in claim 7, wherein two cable cranes (12) are provided, and the two cable cranes (12) move from the middle of the main span to the side spans on both sides respectively.

9. The construction method suitable for the highway and railway dual-purpose cable-stayed suspension cooperative system bridge, according to claim 1, wherein the step of closing the cross section beam section (7) and the cable-stayed section beam section (5) comprises the following specific steps:

after the beam section (7) at the intersection area is hoisted, a closure opening (13) is formed between the beam section (7) at the intersection area and the beam section (5) at the diagonal pulling area;

and hoisting a closure section (14) to the closure opening (13) to complete closure of the beam section (7) in the cross area and the beam section (5) in the diagonal pulling area.

10. The construction method of the highway and railway dual-purpose cable-stayed suspension system bridge as claimed in claim 9, wherein the cable-stayed suspension system bridge is symmetrically provided with two closure openings (13), and the two closure openings (13) are synchronously closed to complete the construction of the cable-stayed suspension system bridge.

Technical Field

The application relates to the technical field of bridge construction, in particular to a construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperative system bridge.

Background

With the rapid development of bridge construction industry, the cable-stayed suspension cable cooperation system bridge has the advantages of high rigidity of the cable-stayed bridge and high spanning capacity of the suspension bridge, the main tower is lower than the same-span cable-stayed bridge, and the main cable and anchor rotation size is smaller than that of the same-span suspension bridge, so that the cable-stayed suspension cable cooperation system bridge is the optimal scheme of the large-span highway-railway dual-purpose bridge.

The bridge structure of the cable-stayed and suspension cable cooperation system is special, and the upper structure comprises a suspension bridge anchorage, a main cable, a suspender and a stiffening beam structure, and also comprises a cable-stayed bridge stay cable and a main beam structure, and a reasonable erection sequence of a main tower, the main cable, the stay cable and a steel beam is related to the bridge forming line shape and the reasonable stress state of the main beam and has close relation with the construction period of the upper structure.

In the related technology, the first scheme discloses an overall construction method of a bridge with a partial ground anchor and stayed-cable cooperation system, which comprises the following steps: and hanging a main cable after the construction of the main tower is finished, then installing a beam crane and a cable crane, assembling a beam section cantilever of the cable-stayed section and erecting a beam section of the suspender section, finally closing the side of the cable-stayed section close to the overlapped section of the cable-stayed suspension cables, and closing the side span.

Scheme two discloses a method for erecting a cable-stayed suspension cable cooperation system bridge: after the construction of the main tower is finished, a beam crane is installed, the double cantilevers symmetrically erect the beam sections of the cable-stayed areas and the cable-stayed suspension crossing areas, the cable crane is installed after the beam sections of the cable-stayed areas and the cable-stayed suspension crossing areas are erected, and the beam sections of the main span suspension crossing areas continue to be erected from the main tower to the midspan direction along the installed beam sections of the cable-stayed areas until closure is carried out at the midspan of the main span.

However, the first solution has the following problems: firstly, the first scheme is mainly suitable for a part of anchor type cable-stayed suspension cooperation system bridge, temporary anchoring measures are required to be adopted in catwalk and cable strand construction, and the temporary anchoring measures for the large-span bridge are complex in structure and high in cost; in the second case, in the first case, closure openings are required to be arranged on the side span and the main span side of a single main tower, four closure openings are arranged on the full bridge in total, the number of the closure openings is large, influence factors are complex, and the linear control difficulty of the main beam is large; and the waiting time of the side span beam section is longer.

The second case has the following problems: case two is mainly used for two permanent less ground anchor type cable-stayed suspension cooperative system bridges, the cable-stayed section and the suspension section are constructed in sequence, and the suspension section is required to be less in proportion so as to ensure that the suspension section can be smoothly butted with the cable-stayed section after the construction of the cable-stayed section is finished.

In addition, in the first scheme and the second scheme, the side span beam section needs to be installed by in-situ hoisting, the beam section needs to be turned over ashore or has additional requirements on external conditions (such as water level, transport ship station position and the like) of beam erecting construction, and the control on the construction cost is not favorable; and then, the side spans of the scheme I and the scheme II are both cantilever construction, and support is provided through the stay cables, so that the beam section of the side span can be erected only after the construction of the main tower is finished, only sequential construction can be adopted, the side span and the main tower cannot be constructed synchronously, and the construction period is not convenient to control.

Disclosure of Invention

The embodiment of the application provides a construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperation system bridge, and aims to solve the problems that in the related art, beam sections of side spans can be erected only after the construction of a main tower is completed, sequential construction can be adopted, the side spans and the main tower cannot be constructed synchronously, and the construction period is not controlled favorably.

In a first aspect, a construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperative system bridge is provided, and comprises the following steps:

installing a first-section side span section on a lower cross beam of a main tower, and synchronously constructing an upper tower column on the lower cross beam of the main tower;

hoisting the side span segment to be erected and connecting the side span segment to the first section to form the erected side span segment;

pushing the erected side span segment to move towards the side span side for a preset distance;

repeatedly hoisting the side span segment to be erected and pushing the erected side span segment until the first side span segment moves to the side pier, and stopping pushing to finish the erection of the side span beam segment;

after the construction of the upper tower column is completed, hoisting the beam section of the cable-stayed region and connecting the beam section with the side span beam section; and synchronously erecting a main cable;

and completing the hoisting of the suspension area beam section and the cross area beam section, and closing the cross area beam section and the cable-stayed area beam section to form the cable-stayed suspension cooperation system bridge.

In some embodiments, the leading-section edge-span segment comprises a pilot beam and a leading section connected with each other, and the pilot beam is arranged close to the edge-span side.

In some embodiments:

after a first-section side span section is installed on a lower beam of a main tower, a beam erecting crane is installed on the first-section side span section, and the side span section to be erected is hoisted through the beam erecting crane;

and pushing the first section of the side span section to move the first section of the side span section towards the side span side for a preset distance, and then moving the beam erecting crane towards the middle span side for the preset distance.

In some embodiments, two frame beam cranes are provided, two frame beam cranes are respectively used for erecting the side span beam sections on two sides and installing the beam sections in the cable-stayed area, and the two frame beam cranes are respectively used for erecting the beam sections from the side piers towards the middle direction of the main span.

In some embodiments, the upper tower column is constructed section by section synchronously during the erection of the side span beam section.

In some embodiments:

constructing an anchorage while constructing the upper tower column;

hoisting the beam section of the cable-stayed region and connecting the beam section with the side span beam section; and the main cable is erected synchronously, and the method specifically comprises the following steps:

after the construction of the upper tower column and the anchorages is finished, catwalks are installed between the two anchorages and on the top of the upper tower column;

the main cable is erected above the catwalk, the cable-stayed zone beam section is erected below the catwalk, and a tensioning stay cable is pulled between the cable-stayed zone beam section and the upper tower column.

In some embodiments, completing the hoisting of the suspended section and the cross section, specifically comprising the steps of:

installing a cable crane on the main cable;

and assembling the suspension area beam sections and the cross area beam sections through the cable crane from the main span to the side span.

In some embodiments, two cable cranes are provided, each moving from the main span towards the side spans on either side.

In some embodiments, the step of jointing the beam section at the intersection area and the beam section at the diagonal pulling area specifically includes the following steps:

after the beam sections in the cross area are hoisted, a closure opening is formed between the beam sections in the cross area and the beam sections in the diagonal pulling area;

and hoisting the closure section to the closure opening to complete closure of the beam section at the intersection area and the beam section at the cable-stayed area.

In some embodiments, the cable-stayed suspended cooperative system bridge is symmetrically provided with two closure openings, and the two closure openings are synchronously closed, so as to complete the construction of the cable-stayed suspended cooperative system bridge.

The beneficial effect that technical scheme that this application provided brought includes:

(1) the side span beam section is erected in the embodiment of the application without adopting a cantilever construction mode and is not required to be connected with a stay cable on a main tower, so that the side span beam section is supported; construction is carried out in a pushing pier-passing mode, and a lower beam of the main tower and the side piers are used as vertical supporting points to provide supporting force for the side span beam section in the pushing movement process; therefore, the erection of the side span beam section and the construction of the main tower can be carried out synchronously, the side span beam section does not need to be constructed after the construction of the main tower is finished, the construction of the main tower is the construction period of a full-bridge key line, and the construction period of the key line is saved due to the synchronous construction of the tower beam.

(2) This application embodiment can carry out the construction of the oblique district beam section of drawing of girder in step during main cable erects, and the girder construction is full-bridge key circuit time limit for a project, and key circuit time limit for a project is practiced thrift in the synchronous construction of cable roof beam.

(3) When the oblique-pulling zone beam section of the embodiment of the application is erected, the erection of the suspension zone beam section and the cross zone beam section can be synchronously carried out. The construction of the main span beam section is equivalent to the synchronous operation of 4 sets of equipment, which is 2 times of the symmetrical installation work efficiency of the conventional method, thereby saving the waiting time of closing the large cantilever of the main span beam section and ensuring the safety in the construction process.

(4) Before the cross section beam section and the cable-stayed section beam section are closure, the cable-stayed section beam section is installed, only the main span single-side cantilever state is realized, and the stability and the safety of the large cantilever state in the beam erecting process are improved. And the load of the inclined pulling area and the suspension area reaches the design value basically before closure, the weight of the beam section of the suspension area is small, and the closure construction difficulty is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a construction schematic diagram of a main tower lower beam foundation, a side pier auxiliary pier foundation and an anchorage provided in the embodiment of the present application;

FIG. 2 is a schematic construction diagram of pier-side brackets of a main tower lower cross beam, side piers and auxiliary piers provided by the embodiment of the application;

FIG. 3 is a schematic construction view of an edge-span beam section according to an embodiment of the present disclosure;

fig. 4 is a construction schematic view of a beam section of a cable-stayed region provided by the embodiment of the application;

fig. 5 is a construction schematic diagram of hoisting a suspension section provided in the embodiment of the present application;

fig. 6 is a construction schematic view of closure of a cross-area beam section and a diagonal-pulling area beam section provided in the embodiment of the present application;

fig. 7 is a schematic sectional view illustrating a construction method for a highway and railway dual-purpose cable-stayed suspension system bridge according to an embodiment of the present application.

In the figure: 1. a main tower lower beam; 2. a side span beam section; 20. a first-joint side span segment; 200. a guide beam; 201. the head section; 21. the side span segment to be erected; 3. mounting the tower column; 4. side piers; 5. a cable-stayed zone beam section; 6. a main cable; 7. a cross-zone beam section; 8. a suspension zone beam section; 9. a beam erecting crane; 10. anchorage; 11. auxiliary piers; 12. a cable-mounted crane; 13. closing the opening; 14. and (5) closing the sections.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a construction method suitable for a highway and railway dual-purpose cable-stayed suspension cooperative system bridge, which comprises the following steps:

s1: referring to fig. 3, a first-joint side span segment 20 is installed on a main tower lower cross beam 1, and an upper tower column 3 is synchronously constructed on the main tower lower cross beam 1;

before installing the head-end span segment 20 on the main tower lower beam 1, the method comprises the following steps:

referring to fig. 1, constructing a lower beam foundation, an auxiliary pier foundation and a pier body of a main tower on both sides, and synchronously excavating and pouring an anchorage 10;

referring to fig. 1, the lower tower column and the lower beam are constructed, and the anchorage 10 is continuously constructed;

referring to fig. 2, a pier-side bracket of a main tower lower beam 1, a side pier 4 and an auxiliary pier 11 on both sides is erected, a temporary buttress is arranged between the main tower lower beam 1 and the auxiliary pier 11, and an anchorage 10 is constructed continuously;

s2: as shown in fig. 3, hoisting the side span segment 21 to be erected and connecting with the first section side span segment 20 to form the erected side span segment;

and (3) hoisting the to-be-erected side span segment 21 by using a large floating crane.

S3: referring to FIG. 4, the erected span segment is pushed to move a predetermined distance toward the side span side;

s4: as shown in fig. 5, the side span segment 21 to be erected is repeatedly hoisted and the erected side span segment is pushed until the first side span segment 20 moves to the side pier 4, and the pushing is stopped, so as to complete the erection of the side span beam segment 2;

s5: referring to fig. 5, after the construction of the upper tower column 3 is completed, the beam section 5 of the cable-stayed region is hoisted and connected with the side span beam section 2; and synchronously erecting a main cable 6;

s6: as shown in fig. 6 and 7, the hoisting of the suspension district beam section 8 and the crossing district beam section 7 is completed, and the crossing district beam section 7 is jointed with the cable-stayed district beam section 5 to form a cable-stayed suspension cooperative system bridge.

Firstly, the erection of the side span beam section 2 in the embodiment of the application does not adopt a cantilever construction mode, and does not need to be connected with a stay cable on the upper tower column 3 to provide support for the side span beam section 2; construction is carried out in a pushing pier-passing mode, and a main tower lower beam 1 and a side pier 4 are used as vertical supporting points to provide supporting force for the side span beam section 2 in the pushing movement process; therefore, the erection of the side span beam section 2 and the construction of the upper tower column 3 can be synchronously performed, the side span beam section 2 does not need to be constructed after the construction of the upper tower column 3 is completed, the construction of the upper tower column 3 is a full-bridge key line construction period, and the key line construction period is saved by the synchronous construction of the tower beams.

Secondly, during the main cable 6 of this application embodiment erects, can carry out the construction of the oblique pull district beam section 5 of girder in step, the girder construction is full-bridge key circuit time limit for a project, and the key circuit time limit for a project is practiced thrift in the synchronous construction of cable roof beam.

In addition, when the diagonal-pulling section beam section 5 of the embodiment of the present application is erected, the erection of the suspension section beam section 8 and the cross section beam section 7 can be performed simultaneously. The construction of the main span beam section is equivalent to the synchronous operation of 4 sets of equipment, which is 2 times of the symmetrical installation work efficiency of the conventional method, thereby saving the waiting time of closing the large cantilever of the main span beam section and ensuring the safety in the construction process.

And before the cross section beam section 7 and the cable-stayed section beam section 5 are jointed, the cable-stayed section beam section 5 is installed, only the main span single-side cantilever state is realized, and the stability and the safety of the large cantilever state in the beam erecting process are improved. And the loads of the inclined pulling area and the suspension area are basically up to the design values before closure, and the weight of the beam section 8 of the suspension area is small, so that the closure construction difficulty is reduced.

Optionally, referring to fig. 3, the first-joint edge-span segment 20 includes a guide beam 200 and a first joint 201 connected to each other, and the guide beam 200 is disposed near the edge-span side.

The nose girder 200 of this application embodiment adopts light material, and is lighter than the girder steel, consequently through setting up nose girder 200, can reduce the weight of sidespan beam section 2 in the top removal process, improves the efficiency of construction, practices thrift construction cost.

Optionally, referring to fig. 3, after the first-joint side span segment 20 is installed on the main tower lower beam 1, the girder erection crane 9 is installed on the first-joint side span segment 20, and the side span segment 21 to be erected is hoisted by the girder erection crane 9;

and pushing the first-section side span section 20 to move the first-section side span section towards the side span side for a preset distance, and then moving the girder erection crane 9 towards the middle span side for a preset distance.

This application embodiment is through frame roof beam loop wheel machine 9, adopts the mode hoist and mount of removing to wait to erect boundary span segment 21, accomplishes the erection of boundary span beam section 2, waits to erect boundary span segment 21 and can directly be connected with the boundary span segment that has erect (the boundary span beam section that is located on main tower bottom end rail 1) after the hoist and mount ashore, does not have extra requirement to frame roof beam construction external condition (like the water level, transport ship station position etc.), reduces construction cost.

The frame beam crane 9 of this application embodiment is provided with two, and two frame beam cranes 9 are used for the erection of both sides limit stride beam section 2 and draw district's beam section 5's installation to one side respectively, and two frame beam cranes 9 erect the beam section towards the main span midspan direction from the side mound respectively.

In the erection process of the side span beam section 2 of the embodiment of the application, the section-by-section construction of the upper tower column 3 is synchronously performed.

Further, the predetermined distance is not greater than the length of the edge span segment 21 to be erected.

The to-be-erected side span segment 21 is the length between two segments, and the preset distance is not greater than the length of the to-be-erected side span segment 21, so that the erected side span segment partially extends out of the lower cross beam 1 of the main tower, and the to-be-erected side span segment 21 is conveniently connected with the next to-be-erected side span segment 21.

Optionally, in step S1, the upper tower 3 is constructed and the anchorage 10 is constructed at the same time; step S5, hoisting the diagonal-pulling area beam section 5, and connecting the diagonal-pulling area beam section with the side span beam section 2; and the main cable 6 is erected synchronously, and the method specifically comprises the following steps:

s50: after the construction of the upper tower column 3 and the anchorages 10 is finished, catwalks are installed between the two anchorages 10 and at the top of the upper tower column 3;

s51: a main cable 6 is erected above the catwalk, a cable-stayed area beam section 5 is erected below the catwalk, and a tension stay cable is pulled between the cable-stayed area beam section 5 and the upper tower column 3.

Optionally, referring to fig. 5, the step S6 of completing the hoisting of the suspension girder segment 8 and the crossing girder segment 7 specifically includes the following steps:

s60: installing a cable crane 12 on the main cable 6;

s61: the assembly of the suspension zone beam sections 8 and the cross zone beam sections 7 is performed from midspan to side span by the cable crane 12.

Preferably, two cable cranes 12 are provided, and the two cable cranes 12 are moved from the midspan to the side spans on both sides, respectively.

In the embodiment of the application, the suspension area sections and the cross area sections are hoisted through the two cable cranes 12, the suspension area sections form suspension area beam sections 8 after being assembled, and the cross area sections form cross area beam sections 7 after being assembled.

Optionally, referring to fig. 6 and 7, the step S6 of splicing the cross-section beam segment 7 and the diagonal-pulling section beam segment 5 specifically includes the following steps:

s62: after the hoisting of the cross area beam section 7 is completed, a closure opening 13 is formed between the cross area beam section 7 and the diagonal pulling area beam section 5;

s63: and hoisting the closure section 14 to the closure opening 13 to complete closure of the beam section 7 at the intersection area and the beam section 5 at the inclined pulling area.

The full-bridge closure ports 13 of the embodiment of the application are at two positions, and the two closure ports 13 are synchronously closed; before closure, the loads of the cable-stayed area and the suspension area basically reach the design values, the weight of the beam section 8 of the suspension area is small, and the closure construction difficulty is reduced.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.