CN211772901U - Space abnormal shape steel case arch rib installation device - Google Patents

Space abnormal shape steel case arch rib installation device Download PDF

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Publication number
CN211772901U
CN211772901U CN202020195644.1U CN202020195644U CN211772901U CN 211772901 U CN211772901 U CN 211772901U CN 202020195644 U CN202020195644 U CN 202020195644U CN 211772901 U CN211772901 U CN 211772901U
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CN
China
Prior art keywords
arch rib
steel box
box arch
wedge
installation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN202020195644.1U
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Chinese (zh)
Inventor
邓李坚
杨少东
宋佩超
刘祥
万发明
王承亮
黄江
陈夏良子
伍华刚
周建军
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Guangxi Road and Bridge Engineering Group Co Ltd
Original Assignee
Guangxi Road and Bridge Engineering Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Road and Bridge Engineering Group Co Ltd filed Critical Guangxi Road and Bridge Engineering Group Co Ltd
Priority to CN202020195644.1U priority Critical patent/CN211772901U/en
Application granted granted Critical
Publication of CN211772901U publication Critical patent/CN211772901U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a space special-shaped steel box arch rib installation device, which comprises an installation base body, a bottom adjusting component and a side leveling component; the bottom adjusting assembly is arranged on the mounting base body, and a bottom wedge-shaped block used for jacking one side of the bottom of the steel box arch rib is arranged on the bottom adjusting assembly; the side leveling assembly is arranged on one side, far away from the bottom wedge block, of the mounting base body and is positioned on one inclined side of the steel box arch rib, and the side leveling assembly is provided with a side wedge block for jacking and pressing the side wall of the inclined side of the steel box arch rib; the bottom wedge block and the side wedge block can realize displacement in the vertical direction and the horizontal direction. This installation device simple structure, the easy dismantlement is fit for adjusting the position of steel box arch rib segment in the construction, improves the installation accuracy of steel box arch rib segment.

Description

Space abnormal shape steel case arch rib installation device
Technical Field
The utility model relates to a bridge construction technical field especially relates to a space abnormal shape steel case arch rib installation device.
Background
The installation method of the spatial special-shaped steel box arch mainly comprises a full-framing method, a few-framing method, a cable hoisting method and the like. The full framing method has the advantages of large material consumption, long construction period and great limitation on installation and construction of arch ribs with higher heights. The cable hoisting method is mainly suitable for places such as large rivers and the like which are not suitable for building the support, is long in construction time and limited by site conditions, is only suitable for construction of non-crossed steel box arch bridges, and is not suitable for double-flying-wing extra-large and medium-sized compound arch bridges with both outward-inclined steel box arches and inward-inclined steel box arches. In the process of installing the steel box arch rib by the few-bracket method, the construction progress is fast, the efficiency is high, but the posture of the steel box arch segment needs to be adjusted, and the segments are sequentially and symmetrically installed after the steel box arch segment is turned over to a design angle.
At present, a plurality of cranes are basically adopted in the few-bracket method to turn over the steel box arch rib segments, the turning-over difficulty is high, and the turned-over steel box arch rib segments are not easy to fix, so that the steel box arch rib segments and the welded steel box arch ribs are difficult to accurately pair in the later period when the steel box arch rib segments are welded. For this reason, some adjusting structures are designed on the support by some construction units to assist the crane in adjusting the steel box arch rib sections, for example, in a less-support method, the steel box arch posture adjustment is carried out by arranging a positioning frame on the support, so that the construction difficulty is high, and the safety risk is high; but the current auxiliary adjustment structure is complex in structure, not easy to be rapidly disassembled and assembled and inconvenient to use.
Disclosure of Invention
The utility model discloses aim at solving one of the above-mentioned technical problem at least, provide a space abnormal shape steel box arch rib installation device, this installation device simple structure, easy dismantlement is fit for adjusting the position of steel box arch rib festival section in the construction, improves the installation accuracy of steel box arch rib festival section.
In order to realize the purpose, the utility model discloses a technical scheme be:
a space special-shaped steel box arch rib installation device comprises an installation base body, a bottom adjusting component and a side leveling component; the bottom adjusting assembly is arranged on the mounting base body, and a bottom wedge-shaped block used for jacking one side of the bottom of the steel box arch rib is arranged on the bottom adjusting assembly; the side leveling assembly is arranged on one side, far away from the bottom wedge block, of the mounting base body and is positioned on one inclined side of the steel box arch rib, and the side leveling assembly is provided with a side wedge block for jacking and pressing the side wall of the inclined side of the steel box arch rib; the bottom wedge block and the side wedge block can realize displacement in the vertical direction and the horizontal direction.
As an improvement of the technical scheme, the device also comprises a reaction frame, wherein a plurality of groups of reaction frames are arranged on the reaction frame and are respectively arranged on the installation base body; the bottom adjusting component and the side leveling component are respectively connected with the reaction frame at the corresponding positions.
As an improvement of the above technical scheme, the bottom adjusting assembly comprises a first transverse jack and a first vertical jack, the mounting end of the first transverse jack is connected with the side wall of the bottom wedge block on the side far away from the wedge angle, and the output end of the first transverse jack is connected with the reaction frame at the corresponding position in a sliding manner; the mounting end of the first vertical jack is mounted on the mounting base body, and the output end of the first vertical jack is abutted to the bottom of the bottom wedge block.
As an improvement of the technical scheme, a first steel cushion block is arranged on the mounting base body, and the mounting end of the first vertical jack is mounted on the first steel cushion block.
As an improvement of the technical scheme, the first steel cushion block is provided with a plurality of first supporting blocks, and the first supporting blocks are sequentially padded between the first steel cushion block and the bottom wedge-shaped block.
As an improvement of the technical scheme, the side leveling assembly comprises a second transverse jack and a second vertical jack, the mounting end of the second transverse jack is connected with the bottom of the side wedge block, and the output end of the second transverse jack is abutted against the reaction frame at the corresponding position; the mounting end of the second vertical jack is mounted on the mounting base body, and the output end of the second vertical jack is abutted to the side wall of one side, far away from the wedge angle, of the side wedge block.
As an improvement of the technical scheme, a second steel cushion block is arranged on the mounting base body, and the mounting end of the second vertical jack is mounted on the second steel cushion block.
As an improvement of the technical scheme, the second steel cushion block is provided with a plurality of second supporting blocks, and the second supporting blocks are sequentially padded between the second steel cushion block and the side wall of the side, far away from the wedge angle, of the side wedge block.
As an improvement of the above technical scheme, the installation base body includes support and a plurality of pile top distribution roof beam, all the pile top distribution roof beam is all installed on the support, every group all install two sets ofly on the pile top distribution roof beam the reaction frame, the horizontal regulation end of bottom adjustment assembly and side leveling subassembly respectively with correspond the reaction frame butt of one side, the vertical regulation end of bottom adjustment assembly and side leveling subassembly is connected with the pile top distribution roof beam.
Compared with the prior art, the beneficial effects of this application are:
the utility model discloses a steel case arch rib installation device utilizes the bottom wedge-shaped piece on the bottom adjusting part to jack up one side of steel case arch rib bottom, and such structural design makes the whole steel case arch rib segment can incline and adjust the incline direction of self when the hoist and mount are unloaded, has reduced the trouble that the loop wheel machine adjusted, and the bottom wedge-shaped piece can also support the partial weight of ware steel case arch rib segment simultaneously, can effectively reduce the required load of loop wheel machine later stage when adjusting steel case arch rib segment; in addition, the side wedge blocks on the side leveling assembly are utilized to adjust the side wall on the inclined side of the steel box arch rib, so that the overturning of the whole steel box arch rib segment can be effectively prevented. In addition, vertical and horizontal direction's displacement can all be realized to bottom wedge and side wedge in this application, and such design can cooperate the bottom wedge to adjust the position of whole steel case arch rib festival section, improves the precision of later stage installation. This installation device simple structure, the easy dismantlement is fit for adjusting the position of steel box arch rib segment in the construction, improves the installation accuracy of steel box arch rib segment.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a top view of an embodiment of the present invention;
fig. 3 is a cross-sectional view of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or there can be intervening components, and when a component is referred to as being "disposed in the middle," it is not just disposed in the middle, so long as it is not disposed at both ends, but rather is within the scope of the middle. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items
As shown in fig. 1 to 3, the utility model provides a space special-shaped steel box arch rib installation device, which comprises an installation base body 1, a bottom adjusting component 2 and a side leveling component 3; the bottom adjusting component 2 is arranged on the mounting base body 1, and a bottom wedge block 21 used for jacking one side of the bottom of the steel box arch rib 4 is arranged on the bottom adjusting component 2; the side leveling component 3 is arranged on one side of the installation base body 1 far away from the bottom wedge-shaped block 21 and is positioned on one inclined side of the steel box arch rib 4, and the side leveling component 3 is provided with a side wedge-shaped block 31 for jacking and pressing the inclined side wall of the steel box arch rib 4; both the bottom wedge 21 and the side wedge 31 are capable of vertical and horizontal displacement. In the present application, the bottom wedge 21 and the side wedge 31 may be moved vertically and horizontally by providing the lifting mechanism to both, for example, by using a screw, a cylinder, an oil cylinder, or the like. It should be noted that the steel box arch rib 4 to be adjusted in this application is at least one steel box arch rib segment, and the assembled steel box arch rib in this application is a structure that is obliquely arranged, including both inner inclination and outer inclination, so that the steel box arch rib 4 that is normally square needs to be obliquely hoisted and then welded and fixed.
The utility model discloses a steel case arch rib installation device utilizes bottom wedge 21 on bottom adjusting part 2 to carry out jacking 4 bottom one sides of steel case arch rib, and such structural design makes 4 sections of whole steel case arch rib can incline when the hoist and mount are unloaded and adjust the incline direction of self, has reduced the trouble that the loop wheel machine adjusted, and bottom wedge 21 can also support the partial weight of 4 sections of steel case arch rib simultaneously, can effectively reduce the required load of loop wheel machine later stage when adjusting 4 sections of steel case arch rib; in addition, the side wedge blocks 31 on the side leveling assemblies 3 are used for adjusting the side wall of the inclined side of the steel box arch rib 4, so that the overturning of the whole steel box arch rib 4 section can be effectively prevented. In addition, bottom wedge 21 and side wedge 31 all can realize vertical and horizontal direction's displacement in this application, and such design can cooperate bottom wedge 21 to adjust the position of whole steel case arch rib 4 sections, improves the precision of later stage installation. This installation device simple structure, the easy dismantlement is fit for adjusting the position of 4 sections of steel box arch rib in the construction, improves the installation accuracy of 4 sections of steel box arch rib.
Referring to fig. 1 to 3, the steel box arch rib installation device further comprises a reaction frame 11, wherein the reaction frame 11 is provided with a plurality of groups and is respectively installed on the installation base body 1; the bottom adjusting component 2 and the side leveling component 3 are respectively connected with a reaction frame 11 at corresponding positions. Wherein the reaction frame 11 in the present application is primarily intended to better apply a horizontal reaction force to the bottom adjustment assembly 2 and the side leveling assemblies 3 when effecting lateral movement. Installation base member 1 can be ordinary mounting bracket structure, also can be the work platform of building, but in an embodiment of this application, in order to realize better that it is convenient to dismantle, installation base member 1 includes support 16 and a plurality of pile top distribution beam 17, all pile top distribution beam 17 all installs on support 16, every group all install two sets ofly on the pile top distribution beam 17 reaction frame 11, bottom adjusting part 2 and side leveling subassembly 3's horizontal regulation end respectively with the reaction frame 11 butt that corresponds one side, bottom adjusting part 2 and side leveling subassembly 3's vertical regulation end is connected with pile top distribution beam 17. The support 16 is a support in a conventional few-support method, and the pile top distribution beam 17 is an I-shaped steel erected or placed at the top of the support 16, so that materials can be taken conveniently and later-stage disassembly and assembly are facilitated. In the embodiment, the two groups of reaction frames 11 are designed oppositely, conventional i-shaped steel which is smaller than the pile top distribution beam 17 by a certain specification is welded on the pile top distribution beam 17, and in order to improve the strength, the structure of the small i-shaped steel which is the same as the structure of reinforcing ribs welded on the pile top distribution beam 17 in the opposite direction of the stress can be used for improving the strength. Wherein in the present application a pile top distribution beam 17 is provided with two sets of said reaction frames 11, respectively a bottom adjustment assembly 2 and a side levelling assembly 3, which structures constitute the steel box arch rib installation device of the present application.
With further reference to fig. 3, the bottom adjusting assembly 2 includes a first transverse jack 22 and a first vertical jack 23, a mounting end of the first transverse jack 22 is connected to a side wall of the bottom wedge block 21 on a side far away from the wedge angle, and an output end of the first transverse jack 22 is slidably connected to the reaction frame 11 at a corresponding position; the mounting end of the first vertical jack 23 is mounted on the mounting base body 1, and the output end of the first vertical jack 23 is abutted to the bottom of the bottom wedge block 21. Wherein in order to avoid better the beneath edge of steel case arch rib 4 slope one side and pile bolck distribution beam 17 collision, be provided with first steel cushion block 12 on the installation base member 1 in this application, the installation end of first vertical jack 23 is installed on first steel cushion block 12, utilizes first steel cushion block 12 to step up first vertical jack 23 for whole bottom adjusting part 2 can have fine height, can adapt to different steel case arch rib 4 inclination.
In addition, the side leveling assembly 3 in the present application includes a second transverse jack 32 and a second vertical jack 33, a mounting end of the second transverse jack 32 is connected with the bottom of the side wedge block 31, and an output end of the second transverse jack 32 abuts against the reaction frame 11 at the corresponding position; the mounting end of the second vertical jack 33 is mounted on the mounting base body 1, and the output end of the second vertical jack 33 is abutted to the side wall of the side wedge block 31 far away from the wedge angle. Similarly, a second steel cushion block 14 is arranged on the mounting base body 1, and the mounting end of the second vertical jack 33 is mounted on the second steel cushion block 14. The second steel spacer 14 acts in the same way as the first steel spacer 12, so that a recessed space is formed between them, which is intended to receive the edge of the bottom of the inclined steel box arch rib 4.
In addition, the action of standing up of steel case arch rib 4 in this application is realized through once hoist and cooperate this installation device, wherein only need a loop wheel machine can, wherein correspond the position welding and have the lug on steel case arch rib 4. Firstly, after the whole section of the steel box arch rib 4 is hoisted in place for the first time by the external crane through the steel wire rope, one side of the bottom of the steel box arch rib 4 is firstly contacted with the bottom wedge-shaped block 21, and because the bottom wedge-shaped block 21 has a wedge angle, in the process of gradually lowering the steel box arch rib 4 by the external crane, the supporting force of the bottom wedge-shaped block 21 is gradually increased, the lifting force of the external crane is correspondingly reduced, and when the bottom of the steel box arch rib 4 is gradually contacted with the wedge surface of the bottom wedge-shaped block 21, the inclination of the steel box arch rib 4 is continuously adjusted by the wedge angle presented by the wedge surface of the bottom wedge-shaped block 21, so that the trouble of the traditional adjustment by external equipment is reduced. At this time, after the bottom of the steel box arch rib 4 is completely attached to the wedge-shaped surface of the bottom wedge-shaped block 21, the side leveling assembly 3 is arranged on the inclined side of the steel box arch rib 4, so that the side wedge-shaped block 31 is abutted to the side wall of the steel box arch rib 4, the steel box arch rib 4 is prevented from turning over and transiting, and the whole installation device can support the steel box arch rib 4 to finish one-time hoisting work.
The other hoisting mode of the device is realized by twice hoisting, wherein in the first hoisting, after the hoisting can be carried out by an external crane, the angle of the steel box arch rib 4 is slowly adjusted by a chain block, so that the steel box arch rib 4 is completely matched with the angles of the bottom wedge block 21 and the side wedge blocks 31 on the device; and after the steel box arch rib 4 is lowered to the bottom surface and the side surface to be contacted with the corresponding bottom wedge-shaped block 21 and the corresponding side wedge-shaped block 31, the steel wire rope and the chain block are unloaded, the steel wire rope and the chain block are fixed on the mounting lifting lugs on the steel box arch rib 4 for second lifting and mounting, and the turned-over steel box arch is lifted by the second lifting and mounted according to the designed angle.
After the steel box arch rib 4 is hoisted to the installation position, the longitudinal position of the steel box arch rib 4 is adjusted through the chain block, the elevation of the steel box arch rib 4 is adjusted through the wedge blocks corresponding to the second vertical jack 33 and the first vertical jack 23 respectively, and the transverse position of the wedge blocks is adjusted through the first transverse jack 22 and the second transverse jack 32. Make the structure of whole steel case arch rib 4 align with interim pier segment more easily like this, avoided the welding process steel case arch rib 4 condition appearance of rocking easily.
It should be noted that, in this application after sole wedge 21 and side wedge 31 adjust to design elevation, position, in order to guarantee that steel case arch rib 4 atress is more firm, be provided with a plurality of first supporting blocks 13 on the first steel cushion block 12, first supporting block 13 is padded in proper order between the bottom of first steel cushion block 12 and bottom wedge 21. A plurality of second supporting blocks 15 are arranged on the second steel cushion block 14, and the second supporting blocks 15 are sequentially padded between the second steel cushion block 14 and the side wall of the side wedge block 31 far away from the wedge angle. The second supporting block 15 and the first supporting block 13 can guarantee that the supporting pad tightly pushes the steel box arch rib 4, the section of the steel box arch rib 4 is welded with the temporary pier part, and the installation of the section of the steel box arch rib 4 is completed.
The above embodiments are only used for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of the technical solutions of the present invention.

Claims (9)

1. The utility model provides a space abnormal shape steel case arch rib installation device which characterized in that includes:
installing a base body;
the bottom adjusting assembly is arranged on the mounting base body, and a bottom wedge block used for jacking one side of the bottom of the steel box arch rib is arranged on the bottom adjusting assembly; and
the side leveling assembly is arranged on one side, far away from the bottom wedge block, of the mounting base body and is positioned on one inclined side of the steel box arch rib, and the side leveling assembly is provided with a side wedge block for jacking and pressing the side wall of the inclined side of the steel box arch rib;
and the bottom wedge block and the side wedge blocks can realize displacement in the vertical direction and the horizontal direction.
2. The installation device for the spatial special-shaped steel box arch rib is characterized by further comprising reaction frames, wherein the reaction frames are provided with a plurality of groups and are respectively installed on an installation base body; the bottom adjusting component and the side leveling component are respectively connected with the reaction frame at the corresponding positions.
3. The installation device for the spatial special-shaped steel box arch rib is characterized in that the bottom adjusting assembly comprises a first transverse jack and a first vertical jack, the installation end of the first transverse jack is connected with the side wall of the bottom wedge block on the side far away from the wedge angle, and the output end of the first transverse jack is in sliding connection with the reaction frame in the corresponding position; the mounting end of the first vertical jack is mounted on the mounting base body, and the output end of the first vertical jack is abutted to the bottom of the bottom wedge block.
4. The spatial profile steel box arch rib installation device of claim 3, wherein the installation base is provided with a first steel cushion block, and the installation end of the first vertical jack is installed on the first steel cushion block.
5. The installation device for the spatial special-shaped steel box arch rib as claimed in claim 4, wherein the first steel cushion block is provided with a plurality of first supporting blocks, and the first supporting blocks are sequentially padded between the first steel cushion block and the bottom of the bottom wedge block.
6. The spatial special-shaped steel box arch rib installation device as claimed in claim 2, wherein the side leveling assembly comprises a second transverse jack and a second vertical jack, the installation end of the second transverse jack is connected with the bottom of the side wedge block, and the output end of the second transverse jack is abutted with the reaction frame in the corresponding position; the mounting end of the second vertical jack is mounted on the mounting base body, and the output end of the second vertical jack is abutted to the side wall of one side, far away from the wedge angle, of the side wedge block.
7. The space special-shaped steel box arch rib installation device as claimed in claim 6, wherein a second steel cushion block is arranged on the installation base, and the installation end of the second vertical jack is installed on the second steel cushion block.
8. The installation device for the spatial special-shaped steel box arch rib according to claim 7, wherein a plurality of second supporting blocks are arranged on the second steel cushion block, and the second supporting blocks are sequentially padded between the second steel cushion block and the side wall of the side wedge block far away from the wedge angle.
9. The installation device of a spatial special-shaped steel box arch rib according to claim 2, wherein the installation base body comprises a support and a plurality of pile top distribution beams, all the pile top distribution beams are installed on the support, each pile top distribution beam is provided with two sets of the reaction frames, the horizontal adjusting ends of the bottom adjusting component and the side leveling component are respectively abutted against the reaction frames on the corresponding side, and the vertical adjusting ends of the bottom adjusting component and the side leveling component are connected with the pile top distribution beams.
CN202020195644.1U 2020-02-23 2020-02-23 Space abnormal shape steel case arch rib installation device Expired - Fee Related CN211772901U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020195644.1U CN211772901U (en) 2020-02-23 2020-02-23 Space abnormal shape steel case arch rib installation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020195644.1U CN211772901U (en) 2020-02-23 2020-02-23 Space abnormal shape steel case arch rib installation device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113073568A (en) * 2021-04-10 2021-07-06 中铁广州工程局集团有限公司 Arch beam mounting and positioning device and positioning method
CN114250710A (en) * 2021-12-30 2022-03-29 安徽省公路桥梁工程有限公司 Construction method of steel box tied arch bridge
CN114703764A (en) * 2022-06-07 2022-07-05 中铁三局集团有限公司 Construction method for leveling and shifting high-speed rail inclined box girder
CN116005557A (en) * 2022-12-05 2023-04-25 中铁上海工程局集团第一工程有限公司 Method for mounting large-span flying swallow type basket steel box arch bridge space special-shaped arch rib structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113073568A (en) * 2021-04-10 2021-07-06 中铁广州工程局集团有限公司 Arch beam mounting and positioning device and positioning method
CN114250710A (en) * 2021-12-30 2022-03-29 安徽省公路桥梁工程有限公司 Construction method of steel box tied arch bridge
CN114250710B (en) * 2021-12-30 2024-04-30 安徽省公路桥梁工程有限公司 Construction method of steel box tied arch bridge
CN114703764A (en) * 2022-06-07 2022-07-05 中铁三局集团有限公司 Construction method for leveling and shifting high-speed rail inclined box girder
CN116005557A (en) * 2022-12-05 2023-04-25 中铁上海工程局集团第一工程有限公司 Method for mounting large-span flying swallow type basket steel box arch bridge space special-shaped arch rib structure
CN116005557B (en) * 2022-12-05 2023-09-29 中铁上海工程局集团有限公司 Method for mounting large-span flying swallow type basket steel box arch bridge space special-shaped arch rib structure

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