CN113216014A - Construction method of viaduct slope-adjusting elevated-junction jacking structure - Google Patents
Construction method of viaduct slope-adjusting elevated-junction jacking structure Download PDFInfo
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- CN113216014A CN113216014A CN202110451327.0A CN202110451327A CN113216014A CN 113216014 A CN113216014 A CN 113216014A CN 202110451327 A CN202110451327 A CN 202110451327A CN 113216014 A CN113216014 A CN 113216014A
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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
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Abstract
The invention relates to a construction method of a viaduct slope-adjusting elevated jacking structure, which comprises the following steps: 1) traffic guidance and modification; 2) mounting a support system; 3) installing a limiting device; 4) pre-jacking a jack; 5) jacking the whole viaduct; 6) heightening the pier stud. The invention has the beneficial effects that: according to the invention, the adjustable steel box cushion blocks are arranged on the bent cap, and comprise standard steel box cushion blocks and finely adjustable cushion blocks, so that the height of the steel box cushion blocks can be finely adjusted to serve as temporary protection supports; the two bent cap hoops are arranged on the bent caps, and the limiting steel plates are arranged on the bent cap hoops. Fixing a limiting steel upright post at the bottom of the box girder, enabling the limiting steel upright post to be positioned between two limiting steel plates, and limiting the transverse and longitudinal displacement of the box girder; according to the invention, the pier column hoops are arranged on the pier columns, the brackets are arranged on two sides of the pier column hoops, then the section steel support frames are arranged and erected on the brackets and connected among the steel pipe supports through the section steel support frames, so that the stability of the support system is improved.
Description
Technical Field
The invention relates to a construction method of a viaduct slope-adjusting elevated jacking structure, in particular to a construction method of a viaduct slope-adjusting elevated jacking structure which has the advantages of good field construction efficiency, good stability of a supporting system and enough safe storage, belongs to the field of civil engineering and is suitable for elevated jacking construction engineering of viaducts.
Background
The bridge jacking technology is an economic, efficient and environment-friendly displacement processing means, is mainly applied to projects such as support replacement, elevation adjustment, lower structure maintenance, reinforcement and modification and the like, and is widely applied to bridge construction and maintenance, reinforcement and modification.
Aiming at a specific bridge jacking transformation project, a beam body is easy to generate transverse and longitudinal displacement in the jacking process, and how to strengthen the design of longitudinal and transverse limiting devices ensures that the device has enough rigidity, meets the requirements of longitudinal and transverse limiting, and has enough safety reserve. How to avoid the hydraulic jack to lead to jack inefficacy because of hydraulic failure and cause the roof beam accident that falls. The design of stability of the supporting system is ensured, and enough safety reserve is ensured. These problems will be related to the economics, feasibility and even safety of the project itself.
In conclusion, although the construction of the existing jacking technology obtains better construction effect under the appropriate working condition, the existing jacking technology is not enough in the aspects of limiting the transverse and longitudinal displacement of the beam body in the jacking process, the stability of a supporting system, the failure of a jack and the like. In view of this, in order to improve the quality and efficiency of the field construction, improve the stability of the supporting system, and reduce the construction risk, the invention of the construction method of the viaduct slope-adjusting elevated jacking structure, which has the advantages of good field construction efficiency, good stability of the supporting system, and enough safety reserves, is urgently needed at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the construction method of the viaduct slope-adjusting high-rise jacking structure, which has the advantages of high site construction efficiency, high stability of a supporting system and enough safe storage.
The construction method of the viaduct slope-adjusting elevated jacking structure comprises the following construction steps:
1) traffic guidance and modification: carrying out traffic guide and modification before the construction of the viaduct slope-adjusting overhead connection and jacking;
2) installing a supporting system: arranging a cast-in-place pad beam on the bearing platform, arranging embedded bolts on the cast-in-place pad beam, then installing a steel pipe support between the box beam and the bearing platform, installing a jack on the top of the steel pipe support, and arranging an adjustable steel box cushion block on the cover beam as a temporary protection support;
3) installing a limiting device: the bottom of the box girder is provided with a bridge limiting device, limiting steel upright posts are arranged to limit the transverse and longitudinal displacement of the box girder, and a bridge deck longitudinal limiting device is arranged at a bridge deck expansion joint to limit the longitudinal displacement of the bridge deck in the jacking process;
4) pre-jacking a jack: debugging jacking equipment, then performing hydraulic jack pre-jacking, and installing a following jack;
5) integrally jacking the viaduct: synchronously adjusting the slope and jacking the whole viaduct in equal proportion through a jack, wherein the jacking speed is set according to the proportion of the jacking height;
6) heightening the pier column: and chiseling the curve section part at the top of the pier column, and performing heightening construction on the pier column.
Preferably, the method comprises the following steps: the step 1) of traffic guidance modification specifically comprises the following steps: the construction preparation working stage seals off the projection ground area of the viaduct, keeps the two-way four-lane traffic of the ground road and keeps the traffic of the viaduct; and the jacking construction stage and the under-bridge construction stage seal off the projection surface under the bridge and the upper viaduct area, and keep the two-way four-lane traffic on the ground road and the traffic on the bridge not to be communicated.
Preferably, the method comprises the following steps: and step 2) the adjustable steel box cushion block comprises a standard steel box cushion block and a fine-adjustable cushion block, wherein the fine-adjustable cushion block is positioned on the standard steel box cushion block and is divided into a lower cushion block with internal threads and an upper cushion block with external threads.
Preferably, the method comprises the following steps: and 2) installing a cushion block limiting clamp base at the bottom of the adjustable steel box cushion block, and anchoring the cushion block limiting clamp base on the bent cap.
Preferably, the method comprises the following steps: step 2), arranging a cast-in-place pad beam at the bottom of the steel pipe support, fixing the bottom of the steel pipe support through a pre-buried bolt, and connecting the steel pipe supports through a profile steel support frame; the steel pipe supports and passes through the supplementary drawknot of pier stud, sets up the pier stud staple bolt on the pier stud, and pier stud staple bolt both sides set up the bracket, install the shaped steel support frame on the bracket.
Preferably, the method comprises the following steps: step 3), fixing a steel plate at the bottom of the box girder through an anchor bolt, wherein the steel plate is connected with a limiting steel upright post; the bent cap staple bolt is installed on the bent cap, the bent cap staple bolt is fixed on the bent cap through the staple bolt fastener in a counter-pulling manner, the limiting steel plates are installed on the bent cap staple bolt, the counter-pulling bolt is arranged between the two limiting steel plates, and the limiting steel upright is positioned between the two limiting steel plates.
Preferably, the method comprises the following steps: and step 3) the bridge deck longitudinal limiting device comprises a bottom plate, a top plate, pull plates and counter-force supports, wherein the bottom plate is tightly attached to the bridge deck, the two pull plates are vertically erected on the two sides of the bottom plate, the top plate is located between the two pull plates, the counter-force supports are arranged at the two ends of each pull plate, and the bridge deck longitudinal limiting device is fixed on the bridge deck through anchoring bolts and is connected with the two sections of bridge decks.
Preferably, the method comprises the following steps: and 4) jacking the jack by adopting the combination of the hydraulic jack and the mechanical follow-up jack in the whole process, and supplementing the mechanical follow-up jack on the basis of the hydraulic jack.
The invention has the beneficial effects that:
(1) according to the invention, the adjustable steel box cushion blocks are arranged on the bent cap and comprise standard steel box cushion blocks and finely adjustable cushion blocks, so that the height of the steel box cushion blocks can be finely adjusted to serve as temporary protection supports.
(2) The two bent cap hoops are arranged on the bent caps, and the limiting steel plates are arranged on the bent cap hoops. And fixing a limiting steel upright column at the bottom of the box girder, so that the limiting steel upright column is positioned between the two limiting steel plates, and limiting the transverse and longitudinal displacement of the box girder.
(3) According to the invention, the pier column hoops are arranged on the pier columns, the brackets are arranged on two sides of the pier column hoops, then the section steel support frames are arranged and erected on the brackets and connected among the steel pipe supports through the section steel support frames, so that the stability of the support system is improved.
(4) The bridge deck longitudinal limiting device is arranged on the bridge deck and is connected with two sections of bridge decks to limit the longitudinal displacement of the bridge deck in the jacking process.
(5) The jack adopts the hydraulic and mechanical follow-up jacks to carry out combined jacking in the whole process, and the mechanical follow-up jack is supplemented on the basis of the hydraulic jack, so that the beam falling accident caused by the failure of the jack due to hydraulic failure of the hydraulic jack can be avoided.
Drawings
FIG. 1 is a layout diagram of a bridge limiting device of a viaduct slope-adjusting elevated-junction elevated jacking system of the invention;
FIG. 2 is a layout diagram of the auxiliary steel tube bracing system for pier stud of the present invention;
FIG. 3 is a detailed view of an adjustable steel box spacer of the present invention;
FIG. 4 is a layout view of the longitudinal bridge deck stop of the present invention;
FIG. 5 is a plan view of the deck longitudinal restraint of the present invention;
FIG. 6 is an elevational view of the deck longitudinal stop of the present invention;
fig. 7 is a construction flow chart of the viaduct slope-adjusting elevated-junction jacking structure of the invention.
Description of reference numerals: 1-box girder, 2-bearing platform, 3-capping beam, 4-pile foundation, 5-pier stud, 6-adjustable steel box cushion block, 7-cushion block limit clamp base, 8-standard steel box cushion block, 9-finely adjustable cushion block, 10-steel plate, 11-anchor bolt, 12-limit steel upright post, 13-split bolt, 14-limit steel plate and 15-capping beam hoop, 16-anchor ear fasteners, 17-jacks, 18-steel pipe supports, 19-section steel support frames, 20-pier column anchor ears, 21-brackets, 22-embedded bolts, 23-cast-in-place pad beams, 24-bridge deck, 25-bridge deck longitudinal limiting devices, 26-bottom plates, 27-top plates, 28-pulling plates, 29-counterforce supports and 30-anchoring bolts.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
Fig. 1 is a layout diagram of a limiting device for a viaduct slope-adjusting elevated-junction jacking system bridge, a bearing platform 2 is arranged above a pile foundation 4, a pier stud 5 is arranged above the bearing platform 2, a cover beam 3 is arranged at the top of the pier stud 5, and a box beam 1 is arranged above the pier stud 5. Two bent cap staple bolts 15 are installed on bent cap 3, and bent cap staple bolt 15 is two formula, and is fixed to drawing oppositely through staple bolt fastener 16, installs spacing steel sheet 14 on bent cap staple bolt 15, sets up between two spacing steel sheet 14 and draws bolt 13. Fixing steel plate 10 through crab-bolt 11 in 1 bottom of box girder, steel plate 10 connects spacing steel stand 12, and spacing steel stand 12 passes through welded connection, and the perpendicular of each component that need guarantee during the welding is level and smooth, makes spacing steel stand 12 be located between two spacing steel plates 14, reserves 20 mm's clearance between spacing steel stand 12 and the spacing steel plate 14, and this bridge stop device is spacing to 1 violently, the longitudinal displacement of box girder.
FIG. 2 is a layout diagram of an auxiliary steel pipe bracing system for a pier stud, steel pipe supports 18 are installed between a box girder 1 and a bearing platform 2, the steel pipe supports 18 are made of steel pipes with the diameter of 609mm and the wall thickness of 16mm, cast-in-place pad beams 23 are arranged at the bottoms of the steel pipe supports 18 and fixed through embedded bolts 22, jacks 17 are installed at the tops of the steel pipe supports 18, and the steel pipe supports 18 are connected through section steel bracing frames 19. The installation of shaped steel support frame 19 is passed through the supplementary drawknot of pier stud 5, sets up pier stud staple bolt 20 on pier stud 5, and pier stud staple bolt 20 both sides set up bracket 21, then installation shaped steel support frame 19 on bracket 21, and shaped steel support frame 19 adopts 14# channel-section steel.
FIG. 3 is a detailed view of an adjustable steel box cushion block of the present invention, the adjustable steel box cushion block 6 includes a standard steel box cushion block 8 and a finely adjustable cushion block 9, the standard steel box cushion block 8 adopts a standard steel box concrete cushion block of 450mmx450mm and phi 1250mm, the thickness is 100mm, 200mm and 300mm, and the finely adjustable cushion block 9 is divided into a lower cushion block with internal threads and an upper cushion block with external threads. The adjustable steel box cushion block 6 is provided with a cushion block limiting clamp base 7 at the bottom, and the cushion block limiting clamp base 7 is anchored on the bent cap 3.
FIG. 4 is a layout view of the deck longitudinal restraining device of the present invention, and FIG. 5 is a plan view of the deck longitudinal restraining device of the present invention; FIG. 6 is an elevational view of the deck longitudinal restraint of the present invention. The bridge deck longitudinal limiting device 25 is installed at the position of the bridge deck 24 expansion joint, and the bridge deck longitudinal limiting device 25 comprises a bottom plate 26, a top plate 27, a pulling plate 28 and a counterforce support 29, is fixed on the bridge deck 24 through an anchoring bolt 30, and is used for connecting two sections of bridge decks 24.
The jack 17 of the viaduct slope-adjusting elevated-junction jacking system adopts the hydraulic and mechanical follow-up jacks to jack in the whole process, and the mechanical follow-up jack is supplemented on the basis of the hydraulic jack, so that the beam falling accident caused by the failure of the hydraulic jack due to hydraulic failure of the hydraulic jack can be avoided.
The viaduct slope-adjusting overhead-connection high-lift system needs to be communicated and modified during construction, the viaduct projection ground area is sealed in the construction preparation working stage, bidirectional four-lane traffic of ground roads is kept, and traffic of the viaduct surface is kept. And the jacking construction stage and the under-bridge construction stage seal off the projection surface under the bridge and the upper viaduct area, and keep the two-way four-lane traffic on the ground road and the traffic on the bridge not to be communicated.
Example two
Fig. 7 is a construction flow chart of the viaduct slope-adjusting elevated jacking structure of the present invention, and referring to fig. 6, the construction method of the viaduct slope-adjusting elevated jacking structure includes the following construction steps:
1) traffic guidance and modification: carrying out traffic guide and modification before the construction of the viaduct slope-adjusting overhead connection and jacking;
2) installing a supporting system: arranging a cast-in-place pad beam 23 on the bearing platform 2, arranging embedded bolts 22 on the cast-in-place pad beam 23, then installing a steel pipe support 18 between the box beam 1 and the bearing platform 2, installing a jack 17 at the top of the steel pipe support 18, and arranging an adjustable steel box cushion block 6 on the bent cap 3 as a temporary protection support;
3) installing a limiting device: a bridge limiting device is arranged at the bottom of the box girder 1, limiting steel upright columns 12 are arranged to limit the transverse and longitudinal displacement of the box girder 1, a bridge deck longitudinal limiting device 25 is arranged at the position of an expansion joint of the bridge deck 24 to limit the longitudinal displacement of the bridge deck 24 in the jacking process;
4) jacking by a jack 17: debugging jacking equipment, then performing hydraulic jack pre-jacking, and installing a following jack;
5) integrally jacking the viaduct: the integral viaduct is synchronously adjusted in slope and jacked in equal proportion through a jack 17, and the jacking speed is set according to the proportion of jacking height;
6) heightening the pier stud 5: and chiseling the curve section part at the top of the pier stud 5, and performing pier stud heightening section construction.
The invention can greatly improve the construction efficiency of the viaduct heightening and jacking construction, improve the stability of the supporting system, limit the bridge in the jacking stage and have better safety reserve.
Claims (8)
1. The construction method of the viaduct slope-adjusting elevated jacking structure is characterized by comprising the following construction steps:
1) traffic guidance and modification: carrying out traffic guide and modification before the construction of the viaduct slope-adjusting overhead connection and jacking;
2) installing a supporting system: a cast-in-place pad beam (23) is arranged on the bearing platform (2), the cast-in-place pad beam (23) is provided with an embedded bolt (22), then a steel pipe support (18) is arranged between the box beam (1) and the bearing platform (2), the top of the steel pipe support (18) is provided with a jack (17), and an adjustable steel box cushion block (6) is arranged on the cover beam (3) to serve as a temporary protection support;
3) installing a limiting device: a bridge limiting device is arranged at the bottom of the box girder (1), limiting steel upright posts (12) are arranged to limit the transverse and longitudinal displacement of the box girder (1), a bridge deck longitudinal limiting device (25) is arranged at an expansion joint of a bridge deck (24) to limit the longitudinal displacement of the bridge deck (24) in the jacking process;
4) pre-jacking a jack (17): debugging jacking equipment, then performing hydraulic jack pre-jacking, and installing a following jack;
5) integrally jacking the viaduct: the integral viaduct is synchronously adjusted and jacked in equal proportion through a jack (17), and the jacking speed is set according to the proportion of jacking height;
6) heightening the pier stud (5): and chiseling the curve section part at the top of the pier stud (5) to construct a pier stud heightening section.
2. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: the step 1) of traffic guidance modification specifically comprises the following steps: the construction preparation working stage seals off the projection ground area of the viaduct, keeps the two-way four-lane traffic of the ground road and keeps the traffic of the viaduct; and the jacking construction stage and the under-bridge construction stage seal off the projection surface under the bridge and the upper viaduct area, and keep the two-way four-lane traffic on the ground road and the traffic on the bridge not to be communicated.
3. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: and step 2) the adjustable steel box cushion block (6) comprises a standard steel box cushion block (8) and a fine-adjustable cushion block (9), the fine-adjustable cushion block (9) is positioned on the standard steel box cushion block (8), and the fine-adjustable cushion block (9) is divided into a lower cushion block with internal threads and an upper cushion block with external threads.
4. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: and 2), installing a cushion block limiting clamp base (7) at the bottom of the adjustable steel box cushion block (6), and anchoring the cushion block limiting clamp base (7) on the bent cap (3).
5. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: step 2), arranging a cast-in-place pad beam (23) at the bottom of the steel pipe support (18), fixing the bottom of the steel pipe support (18) through an embedded bolt (22), and connecting the steel pipe supports (18) through a section steel support frame (19); the steel pipe support (18) is through supplementary drawknot of pier stud (5), sets up pier stud staple bolt (20) on pier stud (5), and pier stud staple bolt (20) both sides set up bracket (21), install shaped steel support frame (19) on bracket (21).
6. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: step 3), fixing a steel plate (10) at the bottom of the box girder (1) through an anchor bolt (11), and connecting the steel plate (10) with a limiting steel upright post (12); the bent cap anchor ear (15) is installed on the bent cap (3), the bent cap anchor ear (15) is fixed on the bent cap (3) in an opposite-pulling mode through an anchor ear fastener (16), a limiting steel plate (14) is installed on the bent cap anchor ear (15), an opposite-pulling bolt (13) is arranged between the two limiting steel plates (14), and the limiting steel upright post (12) is located between the two limiting steel plates (14).
7. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: and step 3), the bridge deck longitudinal limiting device (25) comprises a bottom plate (26), a top plate (27), pulling plates (28) and reaction supports (29), the bridge deck (24) is tightly attached to the bottom plate (26), the two pulling plates (28) are vertically erected on the two sides of the bottom plate (26), the top plate (27) is located between the two pulling plates (28), the reaction supports (29) are arranged at the two ends of each pulling plate (28), and the bridge deck longitudinal limiting device (25) is fixed on the bridge deck (24) through anchor bolts (30) and is connected with the two bridge decks (24).
8. The construction method of the viaduct slope-adjusting elevated jacking structure according to claim 1, characterized in that: and 4) the jack (17) is lifted by combining hydraulic and mechanical follow-up jacks in the whole process, and the mechanical follow-up jack is supplemented on the basis of the hydraulic jack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110451327.0A CN113216014B (en) | 2021-04-26 | 2021-04-26 | Construction method of viaduct slope-adjusting elevated-connection jacking structure |
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| CN202110451327.0A CN113216014B (en) | 2021-04-26 | 2021-04-26 | Construction method of viaduct slope-adjusting elevated-connection jacking structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114232518A (en) * | 2021-12-28 | 2022-03-25 | 中国建筑土木建设有限公司 | Method for large-altitude-difference reverse slope adjustment of urban bridge |
| CN114541284A (en) * | 2022-02-28 | 2022-05-27 | 浙江交工金筑交通建设有限公司 | Construction method of bracket system for replacing bridge plate type rubber support |
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| CN210712576U (en) * | 2019-09-27 | 2020-06-09 | 闽晟集团城建发展有限公司 | Multi-hoop truss supporting bailey bracket for cast-in-situ large-span box girder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114232518A (en) * | 2021-12-28 | 2022-03-25 | 中国建筑土木建设有限公司 | Method for large-altitude-difference reverse slope adjustment of urban bridge |
| CN114541284A (en) * | 2022-02-28 | 2022-05-27 | 浙江交工金筑交通建设有限公司 | Construction method of bracket system for replacing bridge plate type rubber support |
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