CN109778702B - Incremental launching construction method for steel box girder spanning existing city overpass - Google Patents

Incremental launching construction method for steel box girder spanning existing city overpass Download PDF

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Publication number
CN109778702B
CN109778702B CN201910139956.2A CN201910139956A CN109778702B CN 109778702 B CN109778702 B CN 109778702B CN 201910139956 A CN201910139956 A CN 201910139956A CN 109778702 B CN109778702 B CN 109778702B
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China
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pushing
steel
box girder
steel box
steel pipe
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CN109778702A (en
Inventor
胡晓飞
李世茂
张帆
李辉
张宇
赵灏
丁一
鲍建文
王亚锋
邓朝辉
丁新胜
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China Railway Seventh Group Co Ltd
Zhengzhou Engineering Co Ltd of China Railway Seventh Group Co Ltd
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China Railway Seventh Group Co Ltd
Zhengzhou Engineering Co Ltd of China Railway Seventh Group Co Ltd
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Abstract

The invention discloses a incremental launching construction method for a steel box girder spanning an existing urban interchange, which comprises the following steps of 1, placing a concrete foundation and installing a steel pipe column; 2. the steel pipe column hoop fasteners are assembled into hoops and are installed on each steel pipe column, and then the adjacent steel pipe columns are connected and fixed through the horizontal connecting rods and the oblique connecting rods; 3. the installation of the horizontal connecting rods and the oblique connecting rods is repeated according to set intervals, and the installation of the construction platform is completed; 4. installing pushing equipment on the construction platform, and installing a load dispersing device above the pushing equipment; 5. the walking type pushing pushes the steel box girder to a designed position through 4 steps of pushing, descending and returning; 6. and after the pushing of the steel box girder is finished, removing the pushing equipment and the steel support system, and finally removing the concrete foundation. The invention has the advantages that the utilization rate of the lateral connecting material of the concrete foundation and the steel pipe column is improved, and the load dispersing device avoids the deformation of the steel box girder.

Description

Incremental launching construction method for steel box girder spanning existing city overpass
Technical Field
The invention relates to a steel box girder pushing construction method, in particular to a steel box girder pushing construction method for crossing an existing city.
Background
The construction of the steel box girder by pushing method refers to a construction method that the steel box girder is assembled section by section on a bridge head assembling platform and pushed forwards longitudinally by pushing equipment to enable the steel box girder to be in place gradually. Generally, after the cast-in-place concrete foundation is poured, maintenance must be carried out for at least 7 days, and the next construction can be carried out after the concrete strength meets the requirement, so that a large amount of time is wasted. General steel box girder construction platform is set up by the steel-pipe column, and the side direction of traditional steel-pipe column support is connected and is cut steel-pipe column side direction connecting rod one by one with connecting rod lug weld in the steel-pipe column side, when treating to demolish steel-pipe column support after the steel-pipe column construction is accomplished, generally uses the gas cutting to cut apart from interface 1 ~ 2m within range when cutting. Because the steel box girder spanning the existing overpass is higher in position, the construction platform is higher in height, more steel pipe column lateral connecting rods need to be arranged, and a large amount of connecting rod loss and a large amount of labor are wasted when the steel pipe columns are erected and dismantled each time. When the general steel box girder is used for pushing, the local stress of a contact surface between a girder body and a fulcrum is overlarge to generate deformation due to the fact that the weight of the steel box girder is large and the area of the fulcrum of pushing equipment is small, meanwhile, due to the fact that the inertia of the girder body is large and the friction force of the contact surface of the fulcrum is small, effective braking force is difficult to form, and pushing speed is limited.
Disclosure of Invention
The invention aims to provide a safe and reliable pushing construction method for crossing the existing urban overpass steel box girder, which reduces loss, saves construction period.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the invention relates to a incremental launching construction method for a steel box girder spanning an existing urban interchange, which comprises the following construction steps:
step 1, placing a prefabricated concrete foundation with an embedded steel plate at a set measuring position; then, respectively installing and fixing a steel pipe column on each concrete foundation;
step 2, after the adjacent 2 steel pipe columns are installed to a set height, firstly assembling hoops through steel pipe column hoop fasteners to install the hoops on each steel pipe column, and then connecting and fixing the adjacent steel pipe columns through horizontal connecting rods and oblique connecting rods;
step 3, repeating the installation of the horizontal connecting rods and the oblique connecting rods according to a set interval distance along the axial direction of the steel pipe column to form a steel supporting system; after the steel support system is installed, placing a main beam and a secondary beam at the top end of the steel pipe column to complete installation of the construction platform;
step 4, installing pushing equipment at the design position of the construction platform, and installing a load dispersing device above each pushing equipment; the load dispersing device consists of a pad beam and a pushing limiting mechanism, and the pad beam and the pushing limiting mechanism are welded into a whole when in use and then sleeved above a walking type pushing jack of a pushing device; the pushing equipment realizes multipoint synchronous pushing through the computer operating hydraulic drive control;
step 5, the walking type pushing comprises 4 steps of pushing, descending and returning, the steel box girder is integrally lifted and supported, then the pushing translation oil cylinder pushes a stroke forwards, then the steel box girder integrally descends and is placed on the temporary buttress, the pushing translation oil cylinder pushes back again to complete pushing of a stroke, and in this way, circulation is performed, and finally the steel box girder is pushed to a designed position through the reciprocating pushing step; in order to avoid overlarge deflection generated in the pushing process of the steel box girder, a guide beam is required to be arranged and is arranged at the front end of the pushing process of the steel box girder;
and 6, after the pushing of the steel box girder is finished, removing the pushing equipment, then dismantling the steel support system, and finally removing the concrete foundation.
The hoop fastener is composed of four arc plates, two ends of each arc plate are respectively provided with outward flanges extending along the radial direction, bolt holes are formed in the outward flanges, the middle parts of the outer surfaces of the arc plates are provided with inserting lugs extending along the radial direction, and pin holes are formed in the inserting lugs.
The pad beam is of a hollow steel box beam structure formed by welding a top plate, a bottom plate, a web plate and a transverse plate; the two sets of pushing limiting mechanisms are respectively welded on the bottom plate at intervals, and each set of pushing limiting mechanism is of an annular structure formed by a pair of arc-shaped vertical plates at intervals.
The invention has the advantages that the utilization rate of lateral connecting materials (horizontal connecting rods and oblique connecting rods) of the concrete foundation and the steel pipe column is improved, the material loss is reduced, and the construction time is saved; the load dispersing device disperses the concentrated load borne by the steel box girder at the pushing fulcrum, and avoids the deformation of the steel box girder. Meanwhile, the lateral connecting material of the concrete foundation and the steel pipe column can be recycled.
Drawings
FIG. 1 is a schematic longitudinal section of the incremental launching construction of the existing overpass steel box girder.
FIG. 2 is a schematic cross-sectional view of the incremental launching construction of the existing overpass steel box girder.
Fig. 3 is a schematic plan view of a concrete foundation according to the present invention.
Fig. 4 is a sectional view taken along line a-a of fig. 3.
FIG. 5 is a schematic plane structure diagram of the lateral connection of two adjacent steel pipe columns according to the invention.
Fig. 6 is a schematic elevational view of fig. 5.
Fig. 7 is a schematic structural view of the hoop fastener of the present invention.
Fig. 8 is a schematic structural view of the horizontal connecting rod (or the diagonal connecting rod) according to the present invention.
Fig. 9 is a schematic view of the assembly of the load spreading device of the present invention with a steel box beam and jacking equipment.
Fig. 10 is a schematic view of the structure of the load dispersing device of the present invention.
Fig. 11 is a schematic diagram of the right-side view of fig. 10.
Fig. 12 is a schematic top view of the structure of fig. 10.
Detailed Description
As shown in fig. 1-10, the incremental launching construction method for the steel box girder spanning the existing urban interchange comprises the following construction steps:
step 1, prefabricating concrete foundations 1.2 in advance, and embedding a steel plate 1.1 at the center of each concrete foundation 1.2 during prefabrication to conveniently fix a steel pipe column 1.3; the lifting lugs are arranged on the concrete foundation 1.2 to facilitate lifting, and the prefabricated concrete foundation 1.2 is placed at the measured position during site construction; then, respectively installing and fixing a steel pipe column 1.3 for supporting a construction platform on each concrete foundation 1.2;
step 2, installing a lateral connecting rod after each steel pipe column 1.3 is installed to a set height to enable the steel pipe columns 1.3 to be connected into a whole, namely: as shown in fig. 5-8, the hoops are assembled by the steel pipe column hoop fasteners to be installed on each steel pipe column 1.3, and then the hoops on the adjacent steel pipe columns 1.3 are connected and fixed by the horizontal connecting rods 2.1 and the oblique connecting rods 2.2; each steel pipe column hoop fastener group consists of four circular arc plates 3.1, two ends of each circular arc plate 3.1 are respectively provided with a flanging 3.2 extending along the radial direction, the flanging 3.2 is provided with a bolt hole, the middle part of the outer surface of the circular arc plate 3.1 is provided with an inserting lug 3.3 extending along the radial direction, and the inserting lug 3.3 is provided with a pin hole; when in connection, two end parts of the horizontal connecting rod 2.1 and the oblique connecting rod 2.2 are respectively inserted into the corresponding inserting lugs 3.3 and are connected and fixed through the inserting pins;
step 3, repeating the installation of the hoop, the horizontal connecting rod 2.1 and the oblique connecting rod 2.2 section by section upwards along the axial direction of the steel pipe column 1.3 according to a set spacing distance, thereby forming a steel supporting system; after the steel support system is installed, placing a main beam and a secondary beam at the top end of the 1.3 steel pipe column to complete installation of the construction platform;
step 4, installing pushing equipment 4.1 at the design position of the construction platform, and installing a load dispersing device above each pushing equipment 4.1; the load dispersing device consists of a pad beam; when in use, the pad beam and the pushing limiting mechanism are welded into a whole and then sleeved on the walking type pushing jack; the pushing equipment 4.1 realizes multipoint synchronous pushing through the computer operation hydraulic drive control;
step 5, the walking type pushing comprises 4 steps of pushing, descending and returning, the steel box girder 4.2 is integrally lifted and supported, the pushing translation oil cylinder is used for pushing forward for a stroke, the steel box girder 4.2 is integrally descended and placed on the temporary buttress, the pushing translation oil cylinder is pushed back to the bottom, and pushing of a stroke is completed, so that the cycle is repeated; finally pushing the steel box girder 4.2 to a designed position through a reciprocating pushing step; in order to avoid overlarge deflection generated in the pushing process of the steel box girder 4.2, a guide beam is required to be arranged and is arranged at the front end of the steel box girder 4.2.
And 6, after the pushing of the steel box girder 4.2 is finished, removing the pushing equipment 4.1, then dismantling the steel support system, and finally removing the concrete foundation 1.2.
As shown in fig. 10-12, the pad beam is a hollow steel box beam structure formed by welding a top plate 5.1, a bottom plate 5.2, a web plate 5.3 and a transverse plate 5.4; two sets of pushing limiting mechanisms are respectively welded on the bottom plate 5.2 at intervals, and each set of pushing limiting mechanism is of an annular structure formed by a pair of circular arc vertical plates 5.5 and 5.6 which are arranged at intervals.
During actual manufacturing, the pad beam can be properly adjusted according to the 4.2 weight of the pushed steel box beam, steel materials are saved, dead weight is reduced, and the pad beam is convenient to mount while stress dispersion of the pad beam is met.
The inner diameters of the arc-shaped vertical plates 5.5 and 5.6 can be adjusted according to the outer diameter of a vertical jack of the pushing equipment 4.1, and the gap is not too large, preferably 5 mm. The heights of the arc-shaped vertical plates 5.5 and 5.6 are determined according to the maximum stroke of the vertical jack of the pushing equipment 4.1, and are preferably 10cm larger than the maximum stroke of the vertical jack; the distance between the two pushing limiting mechanisms is kept the same as the distance between the two vertical jacks of the pushing equipment 4.1.
When the device is used for bridge top pushing construction operation, the load dispersing device is arranged between the pushing equipment 4.1 and the pushed steel box girder 4.2.

Claims (3)

1. A incremental launching construction method for steel box girders crossing existing cities is characterized by comprising the following steps: the method comprises the following construction steps:
step 1, placing a prefabricated concrete foundation (1.2) with an embedded steel plate (1.1) at a set measuring position; then, respectively installing and fixing a steel pipe column (1.3) on each concrete foundation (1.2);
step 2, after 2 adjacent steel pipe columns (1.3) are installed to a set height, firstly assembling a hoop through a steel pipe column hoop fastener to install the hoop on each steel pipe column (1.3), and then connecting and fixing the adjacent steel pipe columns (1.3) through horizontal connecting rods (2.1) and oblique connecting rods (2.2);
step 3, repeating the installation of the horizontal connecting rods (2.1) and the oblique connecting rods (2.2) according to a set interval distance along the axial direction of the steel pipe column (1.3) to form a steel supporting system; after the steel support system is installed, a main beam and a secondary beam are placed at the top end of the steel pipe column (1.3), and the installation of the construction platform is completed;
step 4, installing pushing equipment (4.1) at the design position of the construction platform, and installing a load dispersing device above each pushing equipment (4.1); the load dispersing device consists of a pad beam and a pushing limiting mechanism, and the pad beam and the pushing limiting mechanism are welded into a whole when in use and then sleeved above a walking type pushing jack of a pushing device (4.1); the pushing equipment (4.1) realizes multipoint synchronous pushing through the computer operation hydraulic drive control;
step 5, the walking type jacking supports the whole steel box girder (4.2) through 4 steps of jacking, pushing, descending and returning, then the jacking translation oil cylinder pushes forwards for a stroke, then the whole steel box girder (4.2) descends to be placed on a temporary buttress, the jacking translation oil cylinder jacks back again to finish jacking of a stroke, and the steel box girder (4.2) is pushed to a designed position through the circulation and the reciprocating jacking step; in order to avoid overlarge deflection generated in the pushing process of the steel box girder (4.2), a guide beam is required to be arranged and is arranged at the pushing front end of the steel box girder (4.2);
and 6, after the steel box girder (4.2) is pushed, removing the pushing equipment, then dismantling the steel support system, and finally removing the concrete foundation (1.2).
2. The incremental launching construction method for the steel box girder crossing the existing city according to claim 1, which is characterized in that: the hoop fastener is composed of four arc plates (3.1), two ends of each arc plate (3.1) are respectively provided with a flanging (3.2) extending along the radial direction, the flanging (3.2) is provided with a bolt hole, the middle part of the outer surface of each arc plate (3.1) is provided with an inserting lug (3.3) extending along the radial direction, and the inserting lug (3.3) is provided with a pin hole.
3. The incremental launching construction method for the steel box girder crossing the existing urban interchange according to claim 1 or 2, characterized in that: the pad beam is of a hollow steel box beam structure formed by welding a top plate (5.1), a bottom plate (5.2), a web plate (5.3) and a transverse plate (5.4); the two sets of pushing limiting mechanisms are respectively welded on the bottom plate (5.2) at intervals, and each set of pushing limiting mechanism is of an annular structure formed by a pair of arc-shaped vertical plates (5.5 and 5.6) which are arranged at intervals.
CN201910139956.2A 2019-02-26 2019-02-26 Incremental launching construction method for steel box girder spanning existing city overpass Active CN109778702B (en)

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CN110820542A (en) * 2019-10-11 2020-02-21 张育闻 Assembled buttress structure is used in bridge construction that takes precautions against earthquakes convenient to pour
CN111549670A (en) * 2020-04-30 2020-08-18 中冶(上海)钢结构科技有限公司 Vertical supporting system adopting Bailey frames and construction method

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JP3695716B2 (en) * 2003-02-03 2005-09-14 川田建設株式会社 Floor slab separator
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CN101694093B (en) * 2009-10-12 2011-08-10 中铁大桥局集团第四工程有限公司 Quick positioning and connecting system in inserting and driving steel pipe supporting pile and construction method thereof
CN102912737B (en) * 2012-11-16 2015-02-04 上海市机械施工集团有限公司 Liftable high-bracket trolley and adjacent-span forming and whole-span longitudinal moving mounting process for bridge
CN205295953U (en) * 2015-12-31 2016-06-08 中铁二十局集团第六工程有限公司 Long span steel case back of strideing across existing road pushes away system
CN109235274B (en) * 2018-10-26 2024-03-19 中铁三局集团广东建设工程有限公司 Novel temporary backing beam system for pushing construction and construction method thereof

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