CN111441251A - Construction method for folding steel box girder striding over existing steel girder - Google Patents
Construction method for folding steel box girder striding over existing steel girder Download PDFInfo
- Publication number
- CN111441251A CN111441251A CN202010258170.5A CN202010258170A CN111441251A CN 111441251 A CN111441251 A CN 111441251A CN 202010258170 A CN202010258170 A CN 202010258170A CN 111441251 A CN111441251 A CN 111441251A
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- steel box
- box girder
- closure section
- section steel
- girder
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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
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a construction method of a closure section steel box girder striding over an existing bridge, which is characterized in that a pad seat and a vertical jack are installed on the top surface of a cantilever end of the side span steel box girder striding over two sides of the existing bridge, a lifting lug and a counter-force seat are welded on the top surface of two sides of the closure section steel box girder, and the closure section steel box girder is lifted to the pad seat by using lifting equipment until the vertical jack props up a lifting frame; a longitudinal jack is arranged by utilizing a counter-force seat welded on the steel box girder at the closure section in advance to support the cushion seat; and lifting the lifting frame by a vertical jack on one side of the side span steel box girder to adjust the vertical displacement of the closure section steel box girder, pushing a cushion seat by a longitudinal jack to adjust the longitudinal displacement, and adjusting the closure section steel box girder until the adjustment is finished. And welding the closure section steel box girder and the side span steel box girder of the adjacent section, completing system conversion, and finally dismantling the vertical jack, the longitudinal jack, the hanging bracket, the counter-force seat and the cushion seat. The invention has the advantages that: the construction auxiliary device has a simple structure and high positioning precision, and effectively accelerates the construction progress.
Description
Technical Field
The invention relates to the field of municipal bridge construction, in particular to a construction method of a closure section steel box girder striding over an existing bridge.
Background
With the continuous development of municipal bridge construction technology, in order to reduce the congestion of the existing municipal traffic to the maximum extent, the construction of municipal elevated frames becomes the inevitable choice for the development of the urban traffic. When the viaduct is designed, the viaduct inevitably intersects with the existing bridge, and when the steel box girder striding the existing bridge is installed, how to install the steel box girder quickly avoids influencing the traffic and the structure safety of the existing bridge, which is a difficult problem in construction. The conventional construction method mostly adopts a support method to carry out the installation and construction of the steel box girder, and has the defects that a support needs to be erected on the existing bridge, the structural safety and the traffic of the existing bridge are influenced, and the construction is not facilitated.
Disclosure of Invention
The invention aims to provide a construction method of a closure section steel box girder striding over an existing bridge, which has the advantages of simple structure, convenience in operation, high positioning precision and capability of effectively accelerating the construction progress.
The object of the invention is achieved in that:
a construction method of a closure section steel box girder of an existing overpass is characterized by comprising the following steps: the method comprises the following specific steps:
A. firstly, constructing the side-span steel box girders of each section in the two side areas of the existing viaduct girder by using a support method, and connecting the side-span steel box girders into a whole by welding so that the side-span steel box girders of two adjacent piers of the existing viaduct girder are suspended above the existing viaduct girder;
b: installing a cushion seat and a vertical jack on the top surface of the cantilever end of the side span steel box girder on two sides of the existing viaduct girder;
c: welding lifting lugs and counter-force seats on the top surfaces of two sides of the middle closure section steel box girder, mounting a lifting frame on the lifting lugs, hanging the lifting lugs on the top surfaces of two sides of the closure section steel box girder by using a hoisting device to hoist the closure section steel box girder to a pad seat, and hooking after the closure section steel box girder is aligned with the bridge axis of the side span steel box girder until a vertical jack jacks the lifting frame;
d: a longitudinal jack is arranged at the counter-force seat on the steel box girder at the closure section to support the cushion seat;
e: lifting a hanging bracket by a vertical jack on one side of the existing viaduct beam to adjust the vertical displacement of the closure section steel box beam, adjusting the longitudinal displacement of the closure section steel box beam by a longitudinal jack pushing seat, adjusting the closure section steel box beam, temporarily fixing one side of the closure section steel box beam and the side span steel box beam of the adjacent section after the adjustment is in place, and adjusting the other side of the closure section steel box beam until the adjustment is finished;
f: and welding the closure section steel box girder and the side span steel box girder of the adjacent section to complete system conversion, and finally removing the vertical jack, the longitudinal jack, the hanging bracket, the counter-force seat and the cushion seat to complete construction of the closure section steel box girder.
When the steel box girder construction spanning the existing viaduct is carried out, the side-span steel box girders of each section in the two side areas of the existing viaduct are constructed by utilizing a support method, the side-span steel box girders are connected into a whole by welding, and only the steel box girders of the closure section are left; installing a pad seat and a vertical jack on the top surface of the cantilever end of the side span steel box girder which spans two sides of the existing bridge, welding a lifting lug and a counter-force seat on the top surface of two sides of the closure section steel box girder, installing a hanging bracket, hoisting the closure section steel box girder to the pad seat by using hoisting equipment, and hooking after the closure section steel box girder is aligned with the bridge axis of the side span steel box girder until the vertical jack jacks the hanging bracket; a longitudinal jack is arranged by utilizing a counter-force seat welded on the steel box girder at the closure section in advance to support the cushion seat; and lifting the lifting frame by a vertical jack on one side of the side-span steel box girder to adjust the vertical displacement of the closure section steel box girder, pushing the cushion seat by a longitudinal jack to adjust the longitudinal displacement, adjusting the closure section steel box girder, temporarily fixing one side of the closure section steel box girder and the side-span steel box girder of the adjacent side-span steel box girder after the adjustment is in place, and adjusting the other side of the closure section steel box girder until the adjustment is finished. And welding the closure section steel box girder and the side span steel box girder of the adjacent section to complete system conversion, and finally removing the vertical jack, the longitudinal jack, the hanging bracket, the counter-force seat and the cushion seat to complete construction of the closure section steel box girder.
The invention fully considers traffic jam of municipal works, quickly finishes the adjustment of the closure section steel box girder by arranging the hanging bracket and the fine adjustment device consisting of the longitudinal jack and the vertical jack on the side span steel box girder, ensures the installation quality of the closure section steel box girder and solves the problem that the existing elevated bridge cannot be provided with the bracket. The invention has the advantages that: the construction auxiliary device is simple in structure, convenient to operate, high in positioning accuracy and capable of effectively accelerating construction progress.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a right side view of FIG. 1;
reference numerals: 1-existing elevated bridge, 2-bridge pier, 3-side span steel box girder, 4-closure section steel box girder, 5-pad seat, 6-vertical jack, 7-lifting lug, 8-hanging bracket, 9-counterforce seat, 10-longitudinal jack, and 11-hoisting equipment.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings.
A construction method of a closure section steel box girder of an existing overpass comprises the following specific steps:
A. firstly, constructing the side-span steel box girders 3 of each section in the two side areas of the existing elevated bridge 1 by using a support method, and connecting the side-span steel box girders 3 into a whole by welding, so that the side-span steel box girders 3 of the two adjacent piers 2 of the existing elevated bridge 1 are cantilevered above the existing elevated bridge 1;
b: installing a cushion 5 and a vertical jack 6 on the top surface of the cantilever end of the side span steel box girder 3 which spans two sides of the existing viaduct girder 1;
c: welding lifting lugs 7 and counter-force seats 9 on the top surfaces of two sides of the middle closure section steel box girder 4, mounting a lifting frame 8 on the lifting lugs 7, hanging the closure section steel box girder 4 to a pad seat 5 by using a hoisting device 11 to hang the lifting lugs 7 on the top surfaces of two sides of the closure section steel box girder 4, and hooking after the closure section steel box girder 4 is aligned with the bridge axis of the side span steel box girder 3 until a vertical jack 6 props against the lifting frame 8;
d: a longitudinal jack 10 is arranged at a counter-force seat 9 on the closure section steel box girder 4 and props against the pad seat 5;
e: lifting a hanger 11 by a vertical jack 6 at one side of the existing elevated bridge 1 to adjust the vertical displacement of a closure section steel box girder 4, lifting a cushion seat 5 by a longitudinal jack 10 to adjust the longitudinal displacement of the closure section steel box girder 4, adjusting the closure section steel box girder 4, temporarily fixing one side of the closure section steel box girder 4 and an adjacent section side span steel box girder 3 after the adjustment is in place, and adjusting the other side of the closure section steel box girder 4 until the adjustment is finished;
f: and welding the closure section steel box girder 4 and the side span steel box girder 3 of the adjacent section to complete system conversion, and finally removing the vertical jack 6, the longitudinal jack 10, the hanger 8, the counter-force seat 9 and the cushion seat 5 to complete construction of the closure section steel box girder 4.
In the steps B-E, the closure section steel box 4 beam is adjusted through the vertical jack 6 and the longitudinal jack 10, the precision of the large-scale steel box beam during fine adjustment can be well guaranteed, and meanwhile, the operation is convenient and fast, and the safety risk is low.
Claims (1)
1. A construction method of a closure section steel box girder of an existing overpass is characterized by comprising the following steps: the method comprises the following specific steps:
A. firstly, constructing the side-span steel box girders of each section in the two side areas of the existing viaduct girder by using a support method, and connecting the side-span steel box girders into a whole by welding so that the side-span steel box girders of two adjacent piers of the existing viaduct girder are suspended above the existing viaduct girder;
b: installing a cushion seat and a vertical jack on the top surface of the cantilever end of the side span steel box girder on two sides of the existing viaduct girder;
c: welding lifting lugs and counter-force seats on the top surfaces of two sides of the middle closure section steel box girder, mounting a lifting frame on the lifting lugs, hanging the lifting lugs on the top surfaces of two sides of the closure section steel box girder by using a hoisting device to hoist the closure section steel box girder to a pad seat, and hooking after the closure section steel box girder is aligned with the bridge axis of the side span steel box girder until a vertical jack jacks the lifting frame;
d: a longitudinal jack is arranged at the counter-force seat on the steel box girder at the closure section to support the cushion seat;
e: lifting a hanging bracket by a vertical jack on one side of the existing viaduct beam to adjust the vertical displacement of the closure section steel box beam, adjusting the longitudinal displacement of the closure section steel box beam by a longitudinal jack pushing seat, adjusting the closure section steel box beam, temporarily fixing one side of the closure section steel box beam and the side span steel box beam of the adjacent section after the adjustment is in place, and adjusting the other side of the closure section steel box beam until the adjustment is finished;
f: and welding the closure section steel box girder and the side span steel box girder of the adjacent section to complete system conversion, and finally removing the vertical jack, the longitudinal jack, the hanging bracket, the counter-force seat and the cushion seat to complete construction of the closure section steel box girder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258170.5A CN111441251A (en) | 2020-04-03 | 2020-04-03 | Construction method for folding steel box girder striding over existing steel girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258170.5A CN111441251A (en) | 2020-04-03 | 2020-04-03 | Construction method for folding steel box girder striding over existing steel girder |
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| CN111441251A true CN111441251A (en) | 2020-07-24 |
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| CN202010258170.5A Pending CN111441251A (en) | 2020-04-03 | 2020-04-03 | Construction method for folding steel box girder striding over existing steel girder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112726412A (en) * | 2020-12-28 | 2021-04-30 | 山东大学 | Precise three-dimensional positioning device and method for steel box girder hoisting closure |
| CN113944103A (en) * | 2021-10-22 | 2022-01-18 | 中交路桥建设有限公司 | Assembled support device applied to installation of steel box girder road-crossing bridge and construction method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112726412A (en) * | 2020-12-28 | 2021-04-30 | 山东大学 | Precise three-dimensional positioning device and method for steel box girder hoisting closure |
| CN113944103A (en) * | 2021-10-22 | 2022-01-18 | 中交路桥建设有限公司 | Assembled support device applied to installation of steel box girder road-crossing bridge and construction method |
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Application publication date: 20200724 |