CN112982200B - Underpinning method of existing continuous bridge - Google Patents
Underpinning method of existing continuous bridge Download PDFInfo
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- CN112982200B CN112982200B CN202110340967.4A CN202110340967A CN112982200B CN 112982200 B CN112982200 B CN 112982200B CN 202110340967 A CN202110340967 A CN 202110340967A CN 112982200 B CN112982200 B CN 112982200B
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- steel pipe
- underpinning
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
The invention discloses a underpinning method of an existing continuous bridge, which is characterized in that a steel pipe concrete arch and a new support are used for supporting the bridge below the existing bridge, jacks are arranged on two sides of the new support, arch seats are arranged on arch feet of the steel pipe concrete arch, bored cast-in-place pile foundations are adopted below the arch seats, the arch seats are connected through prestressed concrete tie beams, the steel pipe concrete arch is connected through steel web plates, the existing bridge is jacked up through the jacks, a box girder is dropped onto the new support through the jacks after existing bridge piers are cut, bridge load is transmitted to the arch seats through the steel pipe concrete arch, and finally the bridge load is transmitted to a pile foundation. The method for underpinning the bridge can effectively reduce the influence on the existing bridge in the construction process, effectively control the settlement deformation of the existing bridge in the underpinning process, ensure the reinforcing effect of the bridge, do not influence the normal driving of the existing bridge, and have good popularization and application values for underpinning construction of the small-span continuous bridge.
Description
Technical Field
The invention relates to the technical field of continuous bridge construction, in particular to a underpinning method of an existing continuous bridge.
Background
At present, city construction is developed rapidly, and a plurality of engineering constructions are carried out on the existing structure. The bridge underpinning technology is developed in order to solve the problems of foundation treatment of the original building, bearing of the influence of the adjacent new construction, the need of constructing underground engineering under the original building and the like. The bridge underpinning technology has various forms, and the underpinning method that open excavation foundation pits are positioned under the existing bridge is less, so that the defects still exist and need to be improved. How to effectively control the settlement deformation of the existing bridge in the bridge underpinning process, ensure the safety and the reliability and have good economical efficiency is an urgent problem to be solved.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides a underpinning method of the existing continuous bridge, a steel pipe concrete arch structure is adopted, the settlement deformation of the bridge can be effectively controlled, and an arch support, a tie beam and an open cut foundation pit are shared, so that the engineering cost can be effectively saved, and the technical problems are solved.
The invention realizes the aim by the following technical scheme that the underpinning method of the existing continuous bridge adopts a steel pipe concrete arch structure to perform underpinning construction, the steel pipe concrete arch structure comprises a steel pipe concrete arch, a steel web plate, a new support and a prestressed concrete tie beam, the steel pipe concrete arch and the new support are supported below an existing bridge, the jacks are arranged on two sides of the new support, the steel pipe concrete arch springing is provided with the arch support, the drill cast-in-place pile foundation is adopted below the arch support, the arch supports are connected through a prestressed concrete tie beam, the steel pipe concrete arch is connected through a steel web, the existing bridge is jacked up through the jacks, a box girder falls onto the new support through the jacks after the existing bridge pier is cut, bridge load is transmitted to the arch support through the steel pipe concrete arch, and finally the bridge load is transmitted to the drill cast-in-place pile foundation.
The underpinning method comprises the following construction steps:
s1: installing a drilling machine at a design position, and constructing an arch support drilling pile and a foundation pit supporting structure to be excavated;
s2: after the pile foundation reaches the strength, pile heads are broken to connect pile body reinforcing steel bars and arch seat tie beam reinforcing steel bars to form a whole, an arch seat and a prestressed concrete tie beam are cast and constructed, the arch seat and an open cut foundation pit supporting structure form a whole, and the prestressed concrete tie beam also serves as a supporting structure;
s3: erecting a support in a foundation pit, assembling a main arch steel pipe, constructing concrete in the pipe, and stretching the prestress of a main arch girder after the concrete reaches the strength;
s4: and four temporary jacks are installed at the designed positions of the vault, the box girder is jacked up by 1mm after a box girder bottom plate is tightly jacked, the existing pier stud is cut by the rope saw, and after the cutting is finished, the box girder falls onto a new support by using the jacks, so that the whole underpinning construction process is finished.
In the underpinning method of the existing continuous bridge, the steel pipe concrete arch is in a four-parallel circular steel pipe concrete arch structure.
According to the underpinning method of the existing continuous bridge, the steel web plate is connected with the steel pipe concrete arch in a welding mode, and the steel platform is welded on the steel web plate at the top of the steel pipe concrete arch and used for placing the new support and the new jack.
In the underpinning method of the existing continuous bridge, the new support and the existing bridge support are positioned on the same straight line.
In the underpinning method of the existing continuous bridge, the jacks are positioned at two sides of the new support, are symmetrically arranged and are arranged on the same straight line with the new support.
In the underpinning method of the existing continuous bridge, the bored pile foundations are bored piles, and the distances between the adjacent bored pile foundations are the same.
Generally, compared with the prior art, the technical scheme conceived by the invention can achieve the following beneficial effects: the underpinning method of the existing continuous bridge adopts a steel pipe concrete arch structure, and an arch support, a tie beam and an open cut foundation pit are shared, so that the engineering cost is effectively saved, the construction period is short, the influence on the existing bridge in the construction process can be effectively reduced, the settlement deformation of the existing bridge in the underpinning process can be effectively controlled, the bridge reinforcing effect is ensured, the normal driving of the existing bridge is not influenced, and the underpinning method has good popularization and application values on the underpinning construction of the continuous bridge across the construction area.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a view showing a vertical structure of a steel pipe concrete arch structure according to the present invention;
FIG. 2 is a plan view of a steel pipe concrete arch structure according to the present invention;
FIG. 3 is a schematic view of the connection between the concrete filled steel tubular arch and the steel platform according to the present invention;
FIG. 4 is a schematic view of the connection of the new support, jack and steel platform of the present invention;
in the figure: 1-steel pipe concrete arch, 2-steel web, 3-new support, 4-prestressed concrete tie beam, 5-arch support, 6-bored cast-in-place pile foundation, 7-jack and 8-steel platform.
Detailed Description
The invention relates to a underpinning method of an existing continuous bridge, which adopts a steel pipe concrete arch structure to carry out underpinning construction, as shown in figures 1 and 2, is a vertical view and a plane view of the steel pipe concrete arch structure, and comprises a steel pipe concrete arch 1, a steel web 2, a new support 3, a prestressed concrete tie beam 4, arch seats 5, a bored cast-in-place pile foundation 6, jacks 7 and a steel platform 8, wherein the steel pipe concrete arch 1 and the new support 3 are supported below the existing bridge, the jacks 7 are arranged at two sides of the new support 3, the arch feet of the steel pipe concrete arch 1 are provided with the arch seats 5, the bored cast-in-place pile foundation 6 is adopted below the arch seats 5, the arch seats 5 are connected by the prestressed concrete tie beam 4, the steel pipe concrete arch 1 is connected by the steel web 2, the jacks 7 jack up the existing bridge, a box girder is fallen onto the new support 3 by the jacks 7 after cutting the existing bridge, the bridge load is transferred to the arch seats 5 by the steel pipe concrete arch 1, and finally transferred to the bored pile foundation 6.
The steel pipe concrete arch 1 is of four parallel circular steel pipe concrete arch structures, a steel web plate 2 is connected with the steel pipe concrete arch 1 in a welding mode, steel platforms 8 are welded on the steel web plate 2 at the top of the steel pipe concrete arch 1 and used for placing a new support 3 and a jack 7, as shown in figure 3, the new support 3 and an existing bridge support are located on the same straight line, the jacks 7 are located on two sides of the new support 3 and are symmetrically arranged, the new support 3 and the new support are located on the same straight line, a bored cast-in-place pile foundation 6 is a bored cast-in-place pile, the distance between adjacent bored cast-in-place pile foundations 6 is the same, and as shown in figure 4, the steel pipe concrete arch is a schematic connection relation diagram of the new support 3, the jack 7 and the steel platforms 8.
The underpinning method comprises the following construction steps:
the method comprises the following steps: installing a drilling machine at a design position, and constructing an arch support drilling pile and a foundation pit supporting structure to be excavated;
step two: after the pile foundation reaches the strength, breaking off the pile head to connect the pile body steel bar and the arch seat tie beam steel bar to form a whole, pouring a construction arch seat 5 and a prestressed concrete tie beam 4, wherein the arch seat 5 and the open cut foundation pit supporting structure form a whole, and the prestressed concrete tie beam 4 is also used as a supporting structure;
step three: erecting a support in the foundation pit, assembling a main arch steel pipe, constructing concrete in the pipe, and tensioning the prestress of a main arch system beam after the concrete reaches the strength;
step four: the vault design position department installs four temporary jack 7, and after the tight case roof beam bottom plate in top, 1mm with the case roof beam jack-up, the existing pier stud of rope saw cutting, after the cutting was accomplished, utilize jack 7 to drop the case roof beam to new support 3 on, accomplish whole underpinning work progress.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A underpinning method of an existing continuous bridge is characterized in that the underpinning method adopts a steel pipe concrete arch structure to perform underpinning construction, the steel pipe concrete arch structure comprises a steel pipe concrete arch (1), a steel web (2), a new support (3), a prestressed concrete tie beam (4), an arch support (5), a bored cast-in-place pile foundation (6), jacks (7) and a steel platform (8), the steel pipe concrete arch (1) and the new support (3) are supported below the existing bridge, the jacks (7) are arranged on two sides of the new support (3), arch feet of the steel pipe concrete arch (1) are provided with arch supports (5), the bored cast-in-place pile foundation (6) is adopted below the arch supports (5), the arch supports (5) are connected through the prestressed concrete tie beam (4), the steel pipe concrete arch (1) is connected through the steel web (2), and the jacks (7) jack the existing bridge, cutting the existing bridge pier, then dropping the box girder onto a new support (3) by using a jack (7), transferring the bridge load to an arch support (5) from a steel pipe concrete arch (1), and finally transferring the bridge load to a bored pile foundation (6);
the underpinning method comprises the following construction steps:
s1: installing a drilling machine at a design position, and constructing an arch support drilling pile and a foundation pit supporting structure to be excavated;
s2: after the pile foundation reaches the strength, pile heads are broken to connect pile body reinforcing steel bars and arch seat tie beam reinforcing steel bars to form a whole, an arch seat (5) and a prestressed concrete tie beam (4) are cast and constructed, the arch seat (5) and an open cut foundation pit supporting structure form a whole, and the prestressed concrete tie beam (4) is also used as a supporting structure;
s3: erecting a support in the foundation pit, assembling a main arch steel pipe, constructing concrete in the pipe, and tensioning the prestress of a main arch system beam after the concrete reaches the strength;
s4: the vault design position department installs four temporary jack (7), after the tight case roof beam bottom plate in top, with 1mm of case roof beam jack-up, the existing pier stud of rope saw cutting, after the cutting was accomplished, utilize jack (7) to drop the case roof beam to new support (3) on, accomplish whole underpinning work progress.
2. Underpinning method of an existing continuous bridge according to claim 1, said steel reinforced concrete arch (1) being of four parallel circular steel reinforced concrete arch shaped structures.
3. A method for underpinning an existing continuous bridge according to claim 1, wherein the steel web (2) is connected with the steel pipe concrete arch (1) in a welding mode, and a steel platform (8) is welded on the steel web (2) at the top of the steel pipe concrete arch (1) and used for placing a new support (3) and a jack (7).
4. A method for underpinning an existing continuous bridge according to claim 1, wherein said new abutment (3) is positioned in line with the existing bridge abutment.
5. A method for underpinning an existing continuous bridge as claimed in claim 1, wherein said jacks (7) are positioned on both sides of the new support (3), symmetrically arranged, and in the same line with the new support (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110340967.4A CN112982200B (en) | 2021-03-30 | 2021-03-30 | Underpinning method of existing continuous bridge |
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| CN202110340967.4A CN112982200B (en) | 2021-03-30 | 2021-03-30 | Underpinning method of existing continuous bridge |
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| CN112982200A CN112982200A (en) | 2021-06-18 |
| CN112982200B true CN112982200B (en) | 2022-09-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001098514A (en) * | 1999-10-01 | 2001-04-10 | Ps Corp | Method for constructing arch rib of concrete arch bridge |
| CN102277885A (en) * | 2011-05-11 | 2011-12-14 | 中铁二院工程集团有限责任公司 | Method for underpinning pile foundation of high-speed railway continuous rigid frame bridge |
| CN207295510U (en) * | 2017-09-29 | 2018-05-01 | 中国水利水电第八工程局有限公司 | Cross-line continuous beam is whole across dismounting sectional shelf-unit |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN210684430U (en) * | 2019-08-08 | 2020-06-05 | 中铁二十局集团第一工程有限公司 | Main bridge jacking system of large-span tied arch bridge |
| CN112227232A (en) * | 2020-10-16 | 2021-01-15 | 浙江大学 | Pier upright post underpinning method of pier-beam consolidation continuous beam bridge |
-
2021
- 2021-03-30 CN CN202110340967.4A patent/CN112982200B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001098514A (en) * | 1999-10-01 | 2001-04-10 | Ps Corp | Method for constructing arch rib of concrete arch bridge |
| CN102277885A (en) * | 2011-05-11 | 2011-12-14 | 中铁二院工程集团有限责任公司 | Method for underpinning pile foundation of high-speed railway continuous rigid frame bridge |
| CN207295510U (en) * | 2017-09-29 | 2018-05-01 | 中国水利水电第八工程局有限公司 | Cross-line continuous beam is whole across dismounting sectional shelf-unit |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN210684430U (en) * | 2019-08-08 | 2020-06-05 | 中铁二十局集团第一工程有限公司 | Main bridge jacking system of large-span tied arch bridge |
| CN112227232A (en) * | 2020-10-16 | 2021-01-15 | 浙江大学 | Pier upright post underpinning method of pier-beam consolidation continuous beam bridge |
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| CN112982200A (en) | 2021-06-18 |
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