CN110747752A - Floating-dragging method installation process for large-span steel structure arch bridge - Google Patents
Floating-dragging method installation process for large-span steel structure arch bridge Download PDFInfo
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- CN110747752A CN110747752A CN201911053601.8A CN201911053601A CN110747752A CN 110747752 A CN110747752 A CN 110747752A CN 201911053601 A CN201911053601 A CN 201911053601A CN 110747752 A CN110747752 A CN 110747752A
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- steel
- bridge
- crawler crane
- hoisting
- trusses
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
- E01D21/065—Incremental launching
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
Abstract
The invention discloses a floating-dragging method installation process for a large-span steel structure arch bridge, which comprises the following steps: step 1, the steel structure arch bridge comprises a plurality of steel bridge components manufactured in sections, and the steel bridge components are integrally pre-assembled in a factory according to the on-site assembling state; step 2, splicing the steel bridge components according to splicing areas on the onsite river bank, wherein the splicing areas comprise: two steel trusses and two bridge deck plates; step 3, floating and dragging the two steel trusses respectively and hanging the two steel trusses on a pier; step 4, directly hoisting one assembled bridge deck plate between the two steel trusses through the first crawler crane, transporting the other bridge deck plate to the opposite bank by using a barge, and hoisting the other bridge deck plate between the two steel trusses by using the second crawler crane; and 5, assembling and welding the bridge deck plate sections and the steel truss to complete the assembly of the whole steel bridge. The installation process provided by the invention can complete arch bridge installation under the condition of little influence on river navigation, and has the advantages of simple and convenient operation and low installation cost.
Description
Technical Field
The invention relates to a floating-towing method installation process for a large-span steel structure arch bridge, and belongs to the technical field of bridge installation.
Background
When the large-scale steel bridge spans a river, the conventional installation mode is as follows because the river surface is wider: piling in a river, setting a temporary pier, dividing the steel bridge into a plurality of sections according to the span of the temporary pier, sequentially hoisting each section to the temporary pier on site after the construction of a factory to splice the sections into a whole bridge, and then dismantling the temporary pier and the pile.
The scheme has the defects that the method occupies the navigation width of a river channel, has great influence on the passage of the channel, and has high additional cost because the channel must be managed during the whole construction period to ensure the navigation safety. Meanwhile, the construction difficulty of piling and pile pulling is high, the required cost is high, and the construction cost is high.
As shown in fig. 1, the steel arch bridge 10 is a truss structure with a span of 65 meters, and has the structural characteristics that: the main bridge structure adopts a 65m simply supported steel truss bridge, the upper chord member and the lower chord member of the main truss both adopt box-shaped structures, the bridge deck is a whole steel plate, the lower part of the bridge deck is reinforced by a T-shaped cross beam and a U-shaped longitudinal rib, and the bridge deck form a plate frame structure. The total length of the bridge is 65m, the width is 21m, the height is 8m, and the total weight of the steel structure is 850 tons.
The bridge needs to cross a canal, the width of the canal is 55 meters, the water depth is about 2 meters, and the channel is busy. If the temporary bridge piers are erected in the river by piling according to the conventional method, the influence on the channel is large, and the construction cost is high.
Therefore, a new steel bridge river-crossing installation process needs to be developed.
Disclosure of Invention
The invention aims to provide an installation process of a large-span steel structure arch bridge, which does not need to pile and erect temporary piers in a river, can complete the installation of the arch bridge under the condition of little influence on the navigation of the river channel and meets the engineering requirements in the aspects of safety, quality, cost and the like.
In order to achieve the above object, the present invention provides a floating-towing installation process for a large-span steel structure arch bridge, which comprises:
and 3, respectively floating and dragging the two steel trusses and hanging the two steel trusses on a pier, and specifically comprising the following steps of:
step 3.1, a first crawler crane and a truck crane are used for hoisting a steel truss, and one end of the steel truss is hoisted to a barge berthed on the bank side through the walking of the first crawler crane and the rotation of the truck crane;
step 3.2, lowering steel wire ropes of the first crawler crane and the truck crane to fix the first end of the steel truss and the barge deck, and hoisting the second end of the steel truss by the first crawler crane;
3.3, driving the barge and the steel truss to slowly run to the opposite bank through a winch, and enabling the first crawler crane to travel along with the steel truss until the barge leans against the opposite bank;
3.4, arranging a second crawler crane in advance on the opposite bank, hoisting the first end of the steel truss by using the second crawler crane after the barge is close to the bank, hoisting the first end of the steel truss together with the first crawler crane, hoisting the steel truss to a pier by using a double-crane hoisting method, and positioning and connecting the steel truss to a support on the pier;
step 3.5, repeating the step 3.1-3.4 to hang the other steel truss on the pier, so that the two steel trusses are arranged symmetrically;
step 4, directly hoisting one assembled bridge deck plate between two steel trusses through a first crawler crane, transporting the other assembled bridge deck plate to the opposite bank by using a barge, and hoisting the other assembled bridge deck plate between the two steel trusses by using a second crawler crane;
and 5, assembling and welding the bridge deck plate sections and the steel truss to complete the assembly of the whole steel bridge.
The 'site' is the erection site of the steel structure arch bridge on the bank side of the canal.
The steel bridge and the steel arch bridge are short for the steel structure arch bridge.
Preferably, the steel structure arch bridge is divided into a plurality of sections of steel bridge components in a factory according to transportation limit conditions, construction site hoisting conditions and a construction scheme, and the steel bridge components are manufactured in sections.
Preferably, the steel structure arch bridge comprises ten sections of steel bridge components.
Preferably, the splicing area comprises a south steel truss, a north steel truss, an east bridge deck plate and a west bridge deck plate.
Preferably, in step 3.1, the barge is fixed by 4 winches.
Preferably, in step 3.2, the height above the ground of the second end of the steel truss hoisted by the first crawler crane is more than 200 mm.
After the steel bridge components manufactured in sections are transported to the site, the steel bridge components are assembled into a plurality of components (namely an assembly area) such as a steel truss and a bridge deck plate on the river bank on the site, a barge is parked at the bank side in the river, one end of the steel truss is hung on a barge deck, the other end of the steel truss is hung in the air by a crawler crane, the barge is dragged to the opposite bank by a winch, the crawler crane and the barge synchronously walk, when the barge arrives at the opposite bank, the steel truss is hung by the other crawler crane on the opposite bank, the two crawler cranes are lifted together, and the steel truss is hung on a pier and installed and positioned. The bridge deck is divided into two parts which are respectively and directly hoisted between the trusses by cranes on two sides to be assembled and welded with the steel trusses, and the steel bridge is successfully installed across a river.
The invention has the beneficial effects that:
1. the main construction site is on the shore, so that the influence on the passage of the navigation channel is small, and the influence on the navigation channel time is reduced to about 20 days from the original 3 months.
2. The cost (and the dismantling cost) for piling and building the temporary buttress in the river is saved, and compared with the cost for piling, the cost for renting the ship is saved by more than 50 ten thousand yuan.
3. A large amount of original overwater construction is changed into onshore construction, the construction conditions are greatly improved, the progress is accelerated by about one month, and the safety and the quality are ensured.
Drawings
Fig. 1 is an elevation view of a steel arch bridge 10 of truss construction spanning 65 meters.
Fig. 2 is a schematic sectional view of a steel arch bridge 10 according to an embodiment of the present invention.
Fig. 3 is a schematic view of a splicing area of the steel arch bridge 10 in the embodiment of the present invention.
Fig. 4a is a schematic plan view of a state in which the first crawler crane 2 and the truck crane 3 hoist the steel truss 111 according to the embodiment of the present invention; fig. 4b is a schematic elevation view of the first crawler crane 2 and the truck crane 3 in a state of hoisting the steel truss 111 according to the embodiment of the present invention; fig. 4c is a schematic view of the first crawler crane 2 and the truck crane 3 in an embodiment of the present invention in a state where the steel truss 111 is loaded on the ship.
Fig. 5 is a schematic view showing a state where the barge 1 and the steel truss 111 are slowly moved to the opposite bank in the embodiment of the present invention.
Fig. 6a is a schematic plan view of a state in which the second crawler crane 2' lifts the lifting steel truss 111 together with the first crawler crane 2 in the embodiment of the present invention; fig. 6b is a schematic elevation view of the second crawler crane 2' lifting the lifting steel truss 111 together with the first crawler crane 2 in the embodiment of the present invention; fig. 6c is a schematic view of a state that the steel hanging truss 111 is hoisted in place in the embodiment of the invention.
FIG. 7 is a schematic illustration of the east and west deck panels hoisted into position in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "east", "west", "south", "north", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
S1, the steel arch bridge 10 is divided into several sections of steel bridge components 11 (10 sections in this embodiment) in segments in a factory according to transportation limitation conditions, construction site hoisting conditions and construction schemes, and then pre-assembled in the factory according to the on-site assembly state, as shown in fig. 2.
And S2, after the steel bridge assembly 11 is transported to the site, assembling the steel bridge assembly 11 on the river bank of the site. The division of the assembly area is determined according to factors such as site conditions, the capacity of hoisting equipment, the load-carrying tonnage of the barge and the like. The bridge divides the whole bridge into 4 parts, namely a steel truss 111 at the south and the north sides and a bridge deck into an east bridge deck plate block and a west bridge deck plate block 112, as shown in figure 3.
And S3, after the steel trusses on the south and north sides are assembled, berthing a barge 1 with the carrying capacity of 500 tons on the shore in the river, and fixing the barge 1 on the shore through 4 windlasses for controlling the direction of the barge 1. The steel truss 111 is lifted by a first crawler crane 2 and a truck crane 3, and one end of the steel truss 111 is lifted to the barge 1 as shown in fig. 4c by the walking of the first crawler crane 2 and the rotation of the truck crane 3 as shown in fig. 4a and 4 b.
The wire ropes of the first crawler crane 2 and the truck crane 3 are lowered to fix one end of the steel truss 111 to the deck of the barge 1 and the other end thereof is landed on the ground on the shore.
And S4, driving the truck crane away, driving the first crawler crane 2 to one end of the steel truss on the shore, hoisting one end of the steel truss 111 on the shore to be about 200mm away from the ground, and fixing the other end of the steel truss 111 on the deck of the barge 1.
The winch is started to drive the barge 1 and the steel truss 111 to slowly run to the opposite bank, and the first crawler crane 2 simultaneously runs along the steel truss 111 until the barge 1 leans to the opposite bank, as shown in fig. 5.
S5, after the barge 1 is landed, a second crawler crane 2 'is used to lift one end of the steel truss 111, and the steel truss 111 is lifted by the second crawler crane 2' together with the first crawler crane 2, as shown in fig. 6a and 6b, and the steel truss 111 is lifted to the pier by a double crane lifting method, and is connected with the support on the pier in a positioning manner, as shown in fig. 6 c.
And dragging the other steel truss to the pier in the same way.
S6, after the small sections of the bridge deck manufactured by the factory are combined into a whole, the whole is divided into an east section and a west section, the bridge deck on the east side is directly hung between the two steel trusses through a crawler crane, the bridge deck on the west side is transported to the west bank through a barge, and then the bridge deck is hung between the two steel trusses through the crawler crane, as shown in figure 7.
And S7, assembling and welding the bridge deck segments and the steel truss to complete the assembly of the whole steel arch bridge 10.
By adopting the method, the steel arch bridge is successfully installed across the river. The main effects are as follows: 1. the main construction site is on the shore, so that the influence on the passage of the navigation channel is small, and the influence on the navigation channel time is reduced to about 20 days from the original 3 months. 2. The cost (and the dismantling cost) for piling and building the temporary buttress in the river is saved, and compared with the cost for piling, the cost for renting the ship is saved by more than 50 ten thousand yuan. 3. A large amount of original overwater construction is changed into onshore construction, the construction conditions are greatly improved, the progress is accelerated by about one month, and the safety and the quality are ensured.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (6)
1. A floating-towing method installation process for a large-span steel structure arch bridge is characterized by comprising the following steps:
step 1, the steel structure arch bridge comprises a plurality of steel bridge components manufactured in sections, and the steel bridge components are integrally pre-assembled in a factory according to the on-site assembling state;
step 2, after the steel bridge assembly is transported to the site, assembling the steel bridge assembly according to an assembling area on the river bank of the site, wherein the assembling area comprises: two steel trusses and two bridge deck plates;
and 3, respectively floating and dragging the two steel trusses and hanging the two steel trusses on a pier, and specifically comprising the following steps of:
step 3.1, a first crawler crane and a truck crane are used for hoisting a steel truss, and one end of the steel truss is hoisted to a barge berthed on the bank side through the walking of the first crawler crane and the rotation of the truck crane;
step 3.2, lowering steel wire ropes of the first crawler crane and the truck crane to fix the first end of the steel truss and the barge deck, and hoisting the second end of the steel truss through the first crawler crane;
3.3, driving the barge and the steel truss to slowly travel to the opposite bank through a winch, and enabling the first crawler crane to travel along with the steel truss until the barge leans against the opposite bank;
3.4, arranging a second crawler crane in advance on the opposite bank, hoisting the first end of the steel truss by using the second crawler crane after the barge is close to the bank, hoisting the first end of the steel truss together with the first crawler crane, hoisting the steel truss to a pier by using a double-crane hoisting method, and positioning and connecting the steel truss to a support on the pier;
step 3.5, repeating the steps 3.1 to 3.4 to hoist the other steel truss to the pier, so that the two steel trusses are oppositely and symmetrically arranged;
step 4, directly hoisting one assembled bridge deck plate between the two steel trusses through a first crawler crane, transporting the other assembled bridge deck plate to the opposite bank by using a barge, and hoisting the other assembled bridge deck plate between the two steel trusses by using a second crawler crane;
and 5, assembling and welding the bridge deck plate sections and the two steel trusses to complete the assembly of the whole steel structure arch bridge.
2. The floating-towing installation process for a large-span steel structure arch bridge according to claim 1, wherein the steel structure arch bridge is divided into a plurality of sections in a factory according to transportation limitation conditions, construction site hoisting conditions and construction schemes, and the steel bridge components are manufactured in sections.
3. The floating-towing installation process for a large-span steel-structure arch bridge according to claim 2, wherein the steel-structure arch bridge comprises ten sections of steel bridge components.
4. The floating drag method installation process for large-span steel structure arch bridges of claim 1, wherein the splicing area comprises south side steel trusses, north side steel trusses, east bridge deck slabs and west bridge deck slabs.
5. The floating-towing installation process for large-span steel structure arch bridges of claim 1, wherein in step 3.1, the barge is fixed by 4 winches.
6. The floating-towing installation process for the large-span steel structure arch bridge according to claim 1, wherein in the step 3.2, the second end of the steel truss is lifted by the first crawler crane to reach a height above 200mm from the ground.
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| CN201911053601.8A CN110747752A (en) | 2019-10-31 | 2019-10-31 | Floating-dragging method installation process for large-span steel structure arch bridge |
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Cited By (5)
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|---|---|---|---|---|
| CN111619760A (en) * | 2020-04-24 | 2020-09-04 | 中建三局集团有限公司 | Assembling, butt-jointing and positioning method for large floating raft in natural river |
| CN112323634A (en) * | 2020-10-28 | 2021-02-05 | 安徽省交通建设股份有限公司 | Installation system and construction method of steel arch bridge of upper-span channel |
| CN112456330A (en) * | 2020-10-30 | 2021-03-09 | 中国华冶科工集团有限公司 | Hoisting method for large-span steel structure gallery crossing river channel |
| CN112520578A (en) * | 2020-12-01 | 2021-03-19 | 中建八局第四建设有限公司 | Hoisting construction method for lightering-span steel truss girder pontoon |
| CN113651249A (en) * | 2021-08-06 | 2021-11-16 | 中交路桥建设有限公司 | Method for hoisting sling area beam section of half-through basket arch bridge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111619760A (en) * | 2020-04-24 | 2020-09-04 | 中建三局集团有限公司 | Assembling, butt-jointing and positioning method for large floating raft in natural river |
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| CN112456330A (en) * | 2020-10-30 | 2021-03-09 | 中国华冶科工集团有限公司 | Hoisting method for large-span steel structure gallery crossing river channel |
| CN112520578A (en) * | 2020-12-01 | 2021-03-19 | 中建八局第四建设有限公司 | Hoisting construction method for lightering-span steel truss girder pontoon |
| CN113651249A (en) * | 2021-08-06 | 2021-11-16 | 中交路桥建设有限公司 | Method for hoisting sling area beam section of half-through basket arch bridge |
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