CN114837095B - Construction method of steel box girder and precast girder crossed overpass - Google Patents
Construction method of steel box girder and precast girder crossed overpass Download PDFInfo
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- CN114837095B CN114837095B CN202210623391.7A CN202210623391A CN114837095B CN 114837095 B CN114837095 B CN 114837095B CN 202210623391 A CN202210623391 A CN 202210623391A CN 114837095 B CN114837095 B CN 114837095B
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The application relates to a construction method of a steel box girder and precast girder crossed overpass, which relates to the technical field of road bridge construction and comprises the following steps: s1, prefabricating a component; s2, sealing construction; s3, constructing a main bridge; s4, temporary buttress construction of the ramp; s5, deblocking; s6, ramp construction; s7, sealing a skylight; the wing plate of one side of the concrete small box girder component close to the frame in the S1 is constructed by post-pouring, a skylight is formed at the frame, and the skylight is used for the temporary buttress in the S4 to penetrate through and support the ramp. Under the condition that the pre-construction of the main bridge is completed, the skylight is arranged at the left and right framing positions of the main bridge in advance, so that temporary buttresses are conveniently arranged at the positions at the later stage, and the supporting effect is achieved on the steel box girder members of the ramp above the main bridge; therefore, the construction difficulty of the later-stage ramp is reduced, and the influence on traffic below the main bridge during ramp construction is reduced.
Description
Technical Field
The application relates to the technical field of road and bridge construction, in particular to a construction method of a steel box girder and precast girder crossed overpass.
Background
With the progress of society, traffic networks are also growing. Due to limited space, overpasses are increasingly more and more; due to traffic jams in the urban area, viaducts are erected on the existing roads to improve the road transportation capacity; so that viaducts are often erected on the existing pavement; because the ground area is required to be fully closed and managed in the construction process, the influence on traffic is great in the construction process; therefore, the construction progress is required to be quickened, the full-closed time is shortened, and the influence on traffic is reduced.
In real construction, the engineering that needs to erect the ramp on the main bridge is frequently met, after the main bridge construction is completed, the ramp is very inconvenient to erect on the main bridge, and due to the influence of the traffic guiding half-width construction and the space up-down multipoint operation, the construction limiting factor of the steel box girder is large.
Disclosure of Invention
The invention aims to provide a construction method of a steel box girder and precast girder crossed overpass, which solves the problem that the erection of a ramp on a main bridge is limited by traffic guidance.
In a first aspect, the construction method of the cross type overpass between the steel box girder and the precast girder provided by the application adopts the following technical scheme:
a construction method of a steel box girder and precast girder crossed overpass comprises the following steps:
s1 component prefabrication
Prefabricating a concrete small box girder component used for the main bridge and a steel box girder component used for the ramp; the wing plates of the concrete small box girder components positioned at the two sides of the left and right frame parts of the main bridge and close to one side of the frame parts are subjected to post-pouring construction, and the wing plates of the other side and the wing plates of the rest concrete small box girder structure are integrally prefabricated along with the girder body;
s2 sealing construction
Performing closed control on a construction area under the main bridge;
s3 main bridge construction
Constructing a bridge pier, splicing concrete small box girder components on the bridge pier, symmetrically arranging the concrete small box girder components, which are not integrally prefabricated with a girder body, on one side wing plate at the frame of a main bridge, and forming a skylight at the frame of the main bridge;
s4 ramp temporary buttress construction
Building a buttress on the ground below the main bridge, and enabling the buttress to pass through a skylight;
s5 unblocking
Releasing the closed control of the construction area under the main bridge;
s6 ramp construction
Hoisting the steel box girder component, wherein the section position of the steel box girder component is positioned on a buttress, the buttress has a temporary supporting effect on the steel box girder component, and the steel box girder component is welded;
s7 skylight sealing
Dismantling the buttress, and performing post-pouring construction on wing plates which are not integrally prefabricated along with the girder body on the concrete small box girder components positioned on the two sides of the left and right frame division positions of the main bridge, so as to seal the skylight.
By adopting the technical scheme, under the condition that the main bridge is constructed in advance, the skylight is arranged at the left and right frame positions of the main bridge in advance, so that temporary buttresses are conveniently arranged at the positions at the later stage, and the supporting effect is achieved on the steel box girder components of the ramp above the main bridge; therefore, the construction difficulty of the later-stage ramp is reduced, and the influence on traffic below the main bridge during ramp construction is reduced.
Optionally, post-pouring construction is carried out by adopting a hanging die method in S7 skylight sealing.
By adopting the technical scheme, the influence on traffic below the main bridge in skylight sealing construction is reduced.
Optionally, the S7 skylight sealing includes the following steps:
7.1, arranging an upper main keel and an upper auxiliary keel which are vertically crossed in sequence in the downward direction of the post-pouring belt;
7.2, arranging a lower template at the bottom of the post-pouring belt, wherein the bottom of the lower template is downwards provided with a lower auxiliary keel and a lower main keel which are vertically crossed in sequence; and the upper main keel and the lower main keel are connected in a counter-pulling way by a counter-pulling connecting piece;
7.3, arranging two partition plates on the lower template to divide the post-cast strip into two independent post-cast areas, and fixing the positions of the partition plates by using fixing pieces;
and 7.4, tightening the opposite-pull connecting piece to enable the lower template to be tightly attached to the precast concrete small box girder component.
Through adopting above-mentioned technical scheme, lower auxiliary joist holds the lower bolster with lower main joist, and to drawing connecting piece one end and being connected with the last main joist of precast concrete small box girder component top, the other end is connected with lower main joist, twists to drawing connecting piece taut, hugs closely precast concrete small box girder component bottom with the lower bolster, reduces when pouring concrete and leaks thick liquid.
Optionally, the upper main joist and the lower main joist are made of square timber with the length of 8cm x 8 cm; the upper auxiliary keel and the lower auxiliary keel adopt 5cm 7cm steel clad wood.
By adopting the technical scheme, the square timber can play a role in bearing weight, and the toughness is improved; the ladle wood can reduce deformation quantity and prevent damage.
Optionally, the distance between the adjacent lower main keels is 50cm, and the distance between the adjacent lower auxiliary keels is 15cm.
Through adopting above-mentioned technical scheme, guarantee to play sufficient supporting role to the lower bolster, reduce fossil fragments use amount simultaneously, reduce cost and engineering time.
Optionally, the lower template and the partition plate adopt a thick phenolic aldehyde coated plywood.
Optionally, the opposite-pull connecting piece is a PVC hard plastic pipe sleeved with an opposite-pull screw rod.
By adopting the technical scheme, the construction is convenient.
Optionally, the edge of the lower template protrudes from the edge of the post-pouring strip by 10cm.
By adopting the technical scheme, the slurry leakage between the lower template and the concrete small box girder member is reduced, and the construction and the traffic below are affected.
Optionally, a sealing element is arranged at the close contact position of the lower template and the concrete small box girder component.
By adopting the technical scheme, the slurry leakage between the lower template and the concrete small box girder member is reduced, and the construction and the traffic below are affected.
In a second aspect, the present application provides a steel box girder and precast beam crossed overpass, which adopts the following technical scheme: a steel box girder and precast girder crossed overpass is applied to the construction method of the steel box girder and precast girder crossed overpass, wing plates on two sides of a concrete small box girder component are integrally precast with a girder body, and the other side wing plate is constructed by post-casting.
By adopting the technical scheme, the concrete small box girder component is provided for the construction method of the steel box girder and precast beam crossed overpass, so that the construction efficiency can be improved by a precast and post-cast construction mode.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the skylight is arranged at the frame of the main bridge, so that temporary buttresses are conveniently arranged at the frame of the main bridge, and the steel box girder members of the ramp above the main bridge are supported; therefore, the construction difficulty of the later-stage ramp is reduced, the influence on traffic below the main bridge during ramp construction is reduced, and the S2 closed construction time is reduced;
2. in the prefabrication process of the concrete small box girder components, the concrete small box girder components positioned at the two sides of the left and right frame positions of the main bridge are not prefabricated with the girder body integrally, so that the difficulty in arranging a skylight in the later stage is reduced and the difficulty in ramp construction is reduced while the construction time is reduced by prefabricating the concrete small box girder components;
3. and the integral strength of the concrete small box girder member is ensured through post-pouring construction of the skylight.
Drawings
FIG. 1 is a schematic illustration of the process flow of the present application;
FIG. 2 is a schematic side view of the structure of embodiment 1;
FIG. 3 is a schematic cross-sectional structure of embodiment 1;
FIG. 4 is a schematic cross-sectional view of a precast concrete trabecular girder member at the time of the suspension formwork construction described in example 1;
in the figure, 1, a main bridge; 11. prefabricating a concrete small box girder member; 12. a skylight; 2. ramp road; 21. a steel box girder member; 3. a buttress; 41. an upper main keel; 42. a last keel; 43. a lower template; 44. a lower keel; 45. a lower main keel; 46. and (5) a pull-to-pull connecting piece.
Detailed Description
The present application is described in further detail below with reference to fig. 1-4.
As shown in fig. 1, the construction method of the steel box girder and precast girder crossed overpass comprises the following steps:
s1 component prefabrication
Prefabricating a concrete small box girder component used for the main bridge and a steel box girder component used for the ramp; the wing plates of the concrete small box girder components positioned at the two sides of the left and right frame parts of the main bridge and close to one side of the frame parts are subjected to post-pouring construction, and the wing plates of the other side and the wing plates of the rest concrete small box girder structure are integrally prefabricated along with the girder body;
s2 sealing construction
Performing closed control on a construction area under the main bridge;
s3 main bridge construction
Constructing a bridge pier, splicing concrete small box girder components on the bridge pier, symmetrically arranging the concrete small box girder components, which are not integrally prefabricated with a girder body, on one side wing plate at the frame of a main bridge, and forming a skylight at the frame of the main bridge;
s4 ramp temporary buttress construction
Building a buttress on the ground below the main bridge, and enabling the buttress to pass through a skylight;
s5 unblocking
Releasing the closed control of the construction area under the main bridge;
s6 ramp construction
Hoisting the steel box girder component, wherein the section position of the steel box girder component is positioned on a buttress, the buttress has a temporary supporting effect on the steel box girder component, and the steel box girder component is welded;
s7 skylight sealing
Dismantling the buttress, and performing post-pouring construction on wing plates which are not integrally prefabricated along with the girder body on the concrete small box girder components positioned on the two sides of the left and right frame division positions of the main bridge, so as to seal the skylight.
Under the condition that the pre-construction of the main bridge is completed, a skylight is arranged at the left and right frame positions of the main bridge in advance, so that temporary buttresses are conveniently arranged at the positions at the later stage, and a supporting effect is achieved on a steel box girder component of a ramp above the main bridge; therefore, the construction difficulty of the later-stage ramp is reduced, and the influence on traffic below the main bridge during ramp construction is reduced.
Example 1:
the present embodiment will be described in detail with reference to fig. 2 to 4; the north clear road (Beijing high speed-Beijing bearing high speed) rapid transformation engineering 2# standard section, the east-west direction starting point is three-photoelectron garden east road, the end point is the west side of the front west street of the station, the pile number range is K2+740-K6+200, and the total length of the north clear road east-west transformation main line is 3.46km. The pile number K14+400-K18+200 is modified by Beijing-Tibetan auxiliary road in the north and south directions, and the total length is about 3.8Km. The main line spans the Beijing Tibetan high-speed place and is provided with an interchange.
The north clear road main line bridge 1 is of a precast concrete small box girder structure and consists of a plurality of precast concrete small box girder components 11, the north clear road main line bridge 1 straddles on a Z1 ramp 2, and the north clear road main line bridge 1 is of a steel box girder structure and consists of a plurality of steel box girder components 21. According to construction deployment, when the Z1 ramp 2 is constructed, the precast concrete small box girder of the lower main bridge 1 is constructed, traffic respectively passes under the precast concrete small box girders, wing plates are not integrally precast along with girder bodies when the left and right precast concrete small box girder members 11 of the main bridge 1 are prefabricated, a skylight 12 is reserved for the Z1 ramp 2 temporary buttress 3, and after the steel box girder member 21 is hoisted, the reserved skylight 12 is constructed by post-pouring through a hoisting mould process.
The post-pouring construction of the wing plates of the precast concrete small box girder component 11 is to remove the temporary buttress 3 after the structural system of the steel box girder is converted, and pouring is completed at the wing plates of the precast concrete small box girder component 11 by adopting a hanging die method, wherein the precast concrete small box girder component 11 is 15.65m away from the ground, the post-pouring width of the side girder is 0.55m, the hanging die method is adopted for construction, the reserved ends of the girder body and the middle diaphragm steel bars are connected according to a design drawing, the diaphragm plates at the two ends of the precast girder are firstly chiseled before the steel bars are connected, the steel bars are welded in a single side, and the welding length requirement meets the 10d of the standard requirement.
The lower template 43 of the post-cast strip is made of a high-quality bamboo plywood (a thick phenolic aldehyde coated plywood is used in an example) with 15mm, the lower template 43 is processed by expanding 10cm according to the longitudinal post-cast strip width, the lower main joist 45 is 8cm x 8cm square wood, the distance is 50cm, the lower joist 44 is made of 5cm x 7cm steel ladle wood, the distance is 15cm, the lower template 43 is fixedly connected and tensioned by adopting a counter-pull connecting piece 46, the counter-pull connecting piece 46 is exemplified by adopting a counter-pull screw rod to cover a PVC hard plastic pipe, the cross arms of the main joist 41 (8 cm x 8cm square wood) and the upper sub-joist 42 (5 cm x 7cm steel ladle wood) above the lower template 43 are hung on bridge deck flange plates by two rows of counter-pull connecting pieces 46, a sealing piece (a double-sided adhesive tape is adopted in an example) is adhered to the edge of the lower template 43, and the counter-pull connecting piece 46 is tightly adhered to the precast concrete small box girder component 11 by screwing a screw rod.
Specifically, the main and auxiliary isolation belts below the main bridge and the central isolation belt are subjected to hardening treatment (10 days); after the isolation belt is hardened, part of traffic is guided to the hardened isolation belt, local traffic of the north clear road is guided, the enclosure is closed, and construction (28 days) of a substructure with a Z1 ramp above a main bridge and a Z1 steel box girder temporary buttress is carried out.
And after the construction of the lower structure of the Z1 ramp above the main bridge and the temporary buttress is completed, carrying out the hoisting construction (3 days) of the reinforced concrete composite beam.
And (3) pouring concrete of the reinforced concrete composite beam, removing the temporary buttresses and the surrounding baffles after the concrete pouring is completed, and recovering the current traffic (12 days).
The steel box girder and precast girder crossed interchange construction method is adopted to save traffic guiding cost, temporary buttress cost, enclosing and blocking cost and construction cost by about 30 ten thousand yuan; the expected saving period is 53 days.
Example 2: a steel box girder and precast girder crossed overpass is applied to an embodiment 1, wing plates on two sides of a concrete small box girder component 11 are integrally precast with a girder body, and the other side wing plate is constructed by post-pouring.
The embodiments of this embodiment are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, in which like parts are denoted by like reference numerals. Therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. The construction method of the steel box girder and precast girder crossed overpass is characterized by comprising the following steps of:
s1 component prefabrication
Prefabricating a concrete small box girder component used for the main bridge and a steel box girder component used for the ramp; the wing plates of the concrete small box girder components positioned at the two sides of the left and right frame parts of the main bridge and close to one side of the frame parts are subjected to post-pouring construction, and the wing plates of the other side and the wing plates of the rest concrete small box girder structure are integrally prefabricated along with the girder body;
s2 sealing construction
Performing closed control on a construction area under the main bridge;
s3 main bridge construction
Constructing a bridge pier, splicing concrete small box girder components on the bridge pier, symmetrically arranging the concrete small box girder components, which are not integrally prefabricated with a girder body, on one side wing plate at the frame of a main bridge, and forming a skylight at the frame of the main bridge;
s4 ramp temporary buttress construction
Building a buttress on the ground below the main bridge, and enabling the buttress to pass through a skylight;
s5 unblocking
Releasing the closed control of the construction area under the main bridge;
s6 ramp construction
Hoisting the steel box girder component, wherein the section position of the steel box girder component is positioned on a buttress, the buttress has a temporary supporting effect on the steel box girder component, and the steel box girder component is welded;
s7 skylight sealing
Dismantling the buttress, and performing post-pouring construction on wing plates which are not integrally prefabricated along with the girder body on the concrete small box girder components positioned on the two sides of the left and right frame division positions of the main bridge, so as to seal the skylight.
2. The construction method of the cross-type overpass of the steel box girder and the precast girder according to claim 1, wherein post-pouring construction is carried out by adopting a hanging die method in S7 skylight sealing.
3. The construction method of the steel box girder and precast girder crossed overpass according to claim 2, wherein the S7 skylight sealing comprises the following steps:
7.1, arranging an upper main keel and an upper auxiliary keel which are vertically crossed in sequence in the downward direction of the post-pouring belt;
7.2, arranging a lower template at the bottom of the post-pouring belt, wherein the bottom of the lower template is downwards provided with a lower auxiliary keel and a lower main keel which are vertically crossed in sequence; and the upper main keel and the lower main keel are connected in a counter-pulling way by a counter-pulling connecting piece;
7.3, arranging two partition plates on the lower template to divide the post-cast strip into two independent post-cast areas, and fixing the positions of the partition plates by using fixing pieces;
and 7.4, tightening the opposite-pull connecting piece to enable the lower template to be tightly attached to the concrete small box girder component.
4. The construction method of the cross type overpass of the steel box girder and the precast girder according to claim 3, wherein the upper main joist and the lower main joist adopt 8cm square lumber; the upper auxiliary keel and the lower auxiliary keel adopt 5cm 7cm steel clad wood.
5. The construction method of the cross-type overpass of the steel box girder and the precast girder according to claim 4, wherein the distance between the adjacent lower main keels is 50cm, and the distance between the adjacent lower auxiliary keels is 15cm.
6. The construction method of the steel box girder and precast girder crossed overpass of claim 3, wherein the lower template and the partition plate are made of thick phenolic aldehyde coated plywood.
7. The construction method of the cross-shaped overpass of the steel box girder and the precast girder according to claim 3, wherein the opposite-pull connecting piece is a opposite-pull screw rod sleeve PVC hard plastic pipe.
8. The construction method of the cross-type overpass of the steel box girder and the precast girder according to claim 3, wherein the edge of the lower template protrudes 10cm from the edge of the post-cast strip.
9. A construction method of a steel box girder and precast girder crossed overpass according to claim 3, wherein a sealing member is arranged at a position where the lower template is tightly attached to a concrete small box girder member.
10. The steel box girder and precast beam crossed overpass is characterized in that the steel box girder and precast beam crossed overpass construction method is applied to any one of claims 1-9, wing plates on two sides of a concrete small box girder component are integrally prefabricated, and one wing plate and a girder body are integrally prefabricated, and the other wing plate is constructed by post-pouring.
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