CN111593665A - Bridge construction method integrating dismantling and construction - Google Patents

Bridge construction method integrating dismantling and construction Download PDF

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Publication number
CN111593665A
CN111593665A CN202010388210.8A CN202010388210A CN111593665A CN 111593665 A CN111593665 A CN 111593665A CN 202010388210 A CN202010388210 A CN 202010388210A CN 111593665 A CN111593665 A CN 111593665A
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China
Prior art keywords
bridge
construction
existing
newly
built
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CN202010388210.8A
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CN111593665B (en
Inventor
朱勇战
徐勇
苏国明
刘俊
王心顺
黄庭森
李方柯
包艺
刘欢
薛晓博
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China Railway Fifth Survey and Design Institute Group Co Ltd
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China Railway Fifth Survey and Design Institute Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges

Abstract

The invention relates to the technical field of bridge engineering, in particular to a bridge construction method integrating demolition and construction. The bridge construction method comprises the following steps: building a protective shed frame, a construction access road and a temporary support under a bridge; removing the middle two-hole simple supporting arch and the approach bridge of the existing bridge in situ; constructing a tower foundation, a newly-built pier, a bridge tower and a temporary pier of the newly-built cable-stayed bridge; the method comprises the following steps of (1) performing width binding and heightening treatment on existing piers of an existing bridge, and installing a fixed type lifting beam portal frame on the tops of the existing piers; lifting the existing bridge to a preset height through a fixed type lifting beam portal frame; carrying out incremental launching construction on a steel main beam of the newly-built cable-stayed bridge; installing a stay cable of the cable-stayed bridge; lowering the existing bridge to a steel main beam of a newly-built cable-stayed bridge; and (4) dismantling the existing bridge and the fixed type lifting beam portal frame. The construction method enables the construction of the newly-built bridge and the dismantling of the existing bridge to be carried out synchronously, and has the characteristics of easiness in construction, safety, reliability, short construction period, construction cost saving and reduction of influence on railway transportation.

Description

Bridge construction method integrating dismantling and construction
Technical Field
The application relates to the technical field of bridge engineering, in particular to a bridge construction method integrating demolition and construction.
Background
With the rapid development of economic construction, when the existing bridge is damaged or the old bridge cannot meet the requirements of urban construction and economic development, dismantling and reconstruction are needed. At present, no special standard guidance and experience can be used for reference in the aspect of bridge dismantling, and particularly, the bridge dismantling of a large-span over-railway lacks engineering practice, and the dismantling method is still imperfect and is in a starting stage. After years of operation, the strength, rigidity and stability of the old bridge are reduced to different degrees, and the structural stress is more complex; unforeseeable factors are more during the dismantling process, the difficulty of ensuring the safety of structures, personnel and equipment is high, and the old bridge dismantling process has more unknown numbers and is more dangerous than the newly-built bridge. The existing bridge dismantling and new construction scheme adopts a construction process of dismantling an old bridge first and then constructing a new bridge. According to the span of the old bridge, the old bridge is generally dismantled by three methods of integral hoisting dismantling, segmental cutting dismantling of a temporary support under the built bridge and incremental launching construction dismantling after reinforcement.
And the three processes of integral hoisting dismantling, support erection subsection cutting dismantling and reinforced back pushing dismantling all have different adaptability and risks. The integral hoisting is only suitable for bridge structures with small span, the integral hoisting weight is large in the bridge dismantling process, and the requirement on the stability of hoisting equipment is high; the idea of dividing the whole into parts is adopted in the process of erecting the bracket and cutting and dismantling the bracket in sections, so that potential safety hazards of sundries falling exist during beam cutting, the influence on navigation or railway operation of a bridge is large, key point construction is needed, and the construction period is long; the existing bridge pushing and dismantling process can be applied to dismantling of large-span bridge structures, and the problems of high construction difficulty, high safety risk, long construction period and high investment cost exist in the pushing process.
For bridges with large span and complex construction conditions, the construction is very complex no matter the bridge is dismantled or built. Taking a bridge of an upper-span railway marshalling station as an example, contact networks at bridge positions are criss-cross, soft crossing upright columns at two sides are higher than a bridge deck position, the dismantling and the building of the upper-span railway bridge need to be conducted towards railway key points so as to reduce the influence on an operation railway, the dismantling and the building of the existing bridge under the complex environment of the upper-span railway are extremely difficult due to the safety requirement of the railway, and the requirement of bridge construction under the complex environment cannot be met by a conventional bridge dismantling process.
Therefore, the method aims at the problems that the existing bridge of the cross-track railway is high in dismantling difficulty, the influence of newly-built bridge construction on the existing track is large, and the conventional bridge dismantling process cannot meet the requirement of bridge construction.
Disclosure of Invention
The embodiment of the application provides a bridge construction method integrating dismantling and building, wherein a cable-stayed bridge is adopted as a newly-built bridge in the construction method, the construction of the newly-built bridge and the dismantling of the existing bridge are synchronously carried out by lifting the existing bridge and pushing the newly-built bridge, and the method has the characteristics of easiness in construction, safety, reliability, short construction period, construction cost saving and reduction of influence on railway transportation.
The embodiment of the application provides a bridge construction method integrating demolition and construction, which comprises the following steps:
building a protective shed frame, a construction access road and a temporary support under a bridge;
removing the middle two-hole simple supporting arch and the approach bridge of the existing bridge in situ;
constructing a tower foundation, a newly-built pier, a bridge tower and a temporary pier of the newly-built cable-stayed bridge;
the method comprises the following steps of (1) performing width binding and heightening treatment on existing piers of an existing bridge, and installing a fixed type lifting beam portal frame on the tops of the existing piers;
lifting the existing bridge to a preset height through a fixed type lifting beam portal frame;
carrying out incremental launching construction on a steel main beam of the newly-built cable-stayed bridge;
installing a stay cable of the cable-stayed bridge;
lowering the existing bridge to a steel main beam of a newly-built cable-stayed bridge;
and (4) dismantling the existing bridge and the fixed type lifting beam portal frame.
Preferably, before the steel main beam of the newly-built cable-stayed bridge is constructed in a pushing manner, a beam splicing platform is further erected and used for welding a plurality of sections of steel box beams to form the steel main beam;
after the steel main beam of the newly-built cable-stayed bridge is constructed in a pushing mode, the beam splicing platform is detached.
Preferably, before constructing a tower foundation, a newly-built bridge pier, a bridge tower and a temporary pier of the newly-built cable-stayed bridge, the method further comprises assembling a tower crane.
Preferably, the tower column of the bridge tower is constructed by adopting a creeping formwork process.
Preferably, the lower cross beam of the bridge tower is constructed by adopting a vertical die casting process.
Preferably, the length of the steel box girder is 10-15 m.
Preferably, the steel main beam is constructed by adopting a gantry crane assembling and pushing method.
Preferably, the existing bridge is removed using a wheeled gantry system.
Preferably, in the dismantling of the existing bridge and the fixed girder portal, the existing bridge is dismantled directly on the deck of the newly built cable-stayed bridge.
Preferably, the fixed lifting beam gantry comprises a gantry upright, a gantry beam and a gantry lifting system;
the bottom end of the portal upright post is supported at the top of the existing pier.
The bridge construction method integrating the dismantling and the building has the following beneficial effects that:
according to the construction method, a cable-stayed bridge is adopted as a newly-built bridge, and the construction of the newly-built bridge and the dismantling of the existing bridge are synchronously carried out through a construction scheme of lifting the existing bridge and pushing the newly-built bridge; the mechanical model is simple and reliable because the structural stress system of the existing bridge is not changed; the steel main beam of the newly built bridge is used as a bridge dismantling platform, so that the bridge dismantling platform is safe and reliable, and the safety risk that the existing bridge is pushed to pass through the existing line is greatly avoided; the construction of newly-built bridges and the removal of existing bridges can be carried out synchronously, so that the construction period can be shortened; the newly built bridge and the existing bridge are integrated, and only the newly built bridge is pushed, so that the key point time of the over-the-railway construction can be greatly reduced, the influence on railway transportation is reduced, and the investment is saved; therefore, the construction method has the characteristics of easy construction, safety, reliability, short construction period, construction cost saving and reduction of influence on railway transportation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a process flow diagram of a bridge construction method according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a newly-built cable-stayed bridge;
fig. 3 is a side view of the newly constructed cable-stayed bridge of fig. 2;
FIG. 4 is a schematic view of a structure for lifting an existing bridge using a fixed handle gantry;
FIG. 5 is a side view of the fixed boom mast of FIG. 4;
FIG. 6 is a schematic structural view of a bridge tower and a steel girder for constructing a newly constructed bridge;
FIG. 7 is a schematic structural view of a newly constructed bridge when an existing bridge is removed;
fig. 8 is a schematic sectional structure view of fig. 7 when an existing bridge is removed from a newly constructed bridge.
Reference numerals:
1-existing bridge; 11-existing bridge piers;
2-newly building a bridge; 21-a tower foundation; 22-newly building a pier; 23-a bridge tower; 24-a steel main beam; 25-stay cables; 26-a lower cross beam; 27-temporary pier;
3-fixed lifting beam portal frame; 31-a gantry column; 32-gantry beam; 33-gantry lift system;
4-tower crane;
5-tyre gantry crane;
6-beam splicing platform.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the application provides a bridge construction method integrating dismantling and construction, which is mainly suitable for dismantling and building an existing bridge 1 in a complex environment, in particular to a long-span bridge of an upper-span railway. In the embodiment of the present application, taking an old bridge demolition and a newly-built bridge 2 project, in which an existing bridge 1 is a four-arch bridge (122m +62m +62m +122m) spanning an existing railway, as an example, the newly-built bridge 2 adopts a cable-stayed bridge scheme of a steel girder 24-space double-cable-surface cable-stayed bridge, and a deck of the newly-built bridge 2 is wider than that of the existing bridge 1. However, in the actual construction process, the existing bridge 1 which needs to be dismantled is not limited to a four-arch bridge, and the newly-built bridge 2 is not limited to a cable-stayed bridge, and the bridge construction method provided by the embodiment of the application can be adopted for other types of bridges.
As shown in fig. 1, the bridge construction method by the building and demolition integration may include the following steps:
step S100, building a protective shed frame, a construction access road and an under-bridge temporary support; in the actual construction process, in order to facilitate construction, the protective shed frame and the construction pavement can be erected above the auxiliary roads on the two sides in the middle of the existing bridge 1;
s200, removing a middle two-hole simple support arch and an approach bridge of the existing bridge 1 in situ; in order to facilitate the foundation construction of the newly-built cable-stayed bridge, the middle part of the existing bridge 1 and the approach bridge can be removed in situ;
step S300, constructing a tower foundation 21, a newly-built pier 22, a bridge tower 23 and a temporary pier 27 of the newly-built cable-stayed bridge; the newly-built cable-stayed bridge comprises a bridge tower 23, a newly-built bridge pier 22, a stay cable 25 and a steel girder 24; here, taking the steel girder 24 as an example, the newly-built cable-stayed bridge may be built by using other girders; in order to facilitate construction, the tower crane 4 can be assembled before the tower foundation 21, the newly-built bridge pier 22, the bridge tower 23 and the temporary pier 27 of the newly-built cable-stayed bridge are constructed, so that the tower crane 4 can be used for quickly constructing the tower foundation 21, the bridge tower 23, the newly-built bridge pier 22 and the temporary pier 27; the tower crane 4 can be assembled section by section; the design scheme of the newly-built cable-stayed bridge can be shown by referring to the structures in fig. 2 and 3, wherein the newly-built cable-stayed bridge is built at the position of the existing bridge 1, and the bridge floor is higher than that of the existing bridge 1;
step S400, performing width binding and heightening treatment on the existing bridge pier 11 of the existing bridge 1, and installing a fixed type lifting beam portal frame 3 at the top of the existing bridge pier 11; as shown in the configurations of fig. 4 and 5, the fixed handle mast gantry 3 may include a gantry upright 31, a gantry beam 32, and a gantry lift system 33; the portal columns 31 are arranged in pairs, and the bottom ends of the portal columns 31 are supported on the tops of the existing piers 11; the gantry beam 32 is lapped on the top ends of the two gantry upright columns 31 which are oppositely arranged; the gantry lifting system 33 is arranged on the gantry beam 32 and realizes the lifting of the existing bridge 1 through manual control;
step S500, lifting the existing bridge 1 to a preset height H through the fixed type lifting beam portal frame 3; as shown in the structure of fig. 4, the predetermined height H needs to be determined according to actual construction requirements, and the predetermined height H is based on meeting the pushing construction requirement of the steel main beam 24 of the newly-built cable-stayed bridge, so as to facilitate the pushing construction of the steel main beam 24;
s600, carrying out incremental launching construction on a steel main beam 24 of the newly-built cable-stayed bridge; as shown in the structure of fig. 6, in order to accelerate the construction progress and save the construction period, the steel girder 24 can be a prefabricated member, when a newly-built cable-stayed bridge is constructed, the prefabricated steel girder 24 can be directly pushed to a proper position, and when the steel girder 24 is pushed, the guide construction can be carried out through the guide beam, because the newly-built cable-stayed bridge spans the existing railway for construction, the guide beam is constructed to the main point of the railway when the cantilever above the railway moves, and the guide beam can be continuously pushed after being butted with the pier; when the steel main beams 24 need to be spliced on site, the beam splicing platform 6 can be erected on the construction site in advance, and the prefabricated multi-section steel main beams 24 are spliced on site through the beam splicing platform 6; after the steel main beam 24 is pushed to the proper position, the guide beam and the beam splicing platform 6 can be dismantled; the steel main beam 24 can be pushed by a gantry crane (not shown in the figure);
step S700, installing the stay cable 25 of the cable-stayed bridge, and installing the stay cable 25 on the bridge tower 23 and the steel main beam 24 to form a newly-built cable-stayed bridge structure as shown in fig. 7 and 8;
step S800, the existing bridge 1 is lowered to a steel main beam 24 of a newly-built cable-stayed bridge; as shown in the structures of fig. 7 and 8, after the steel main beam 24 of the newly-built cable-stayed bridge is pushed to the right position, the steel main beam 24 is positioned below the existing bridge 1, and the existing bridge 1 lifted to the preset height H by the fixed type girder lifting gantry 3 can be lowered onto the steel main beam 24 or the bridge deck of the newly-built cable-stayed bridge; the steel main beam 24 is reinforced at the corresponding position of the arch bridge support, and is partially filled in the steel main beam 24, so that the load of the existing bridge 1 can be transferred to the existing bridge pier 11;
and S900, removing the existing bridge 1 and the fixed type lifting beam portal frame 3, directly removing the existing bridge 1 on the bridge floor of the newly-built cable-stayed bridge when the existing bridge 1 is removed after the construction of the newly-built cable-stayed bridge is completed, and simultaneously removing the fixed type lifting beam portal frame 3 for lifting the existing bridge 1, wherein at the moment, the removal of the existing bridge 1 and the construction of the newly-built cable-stayed bridge are completed. When the existing bridge 1 is dismantled on the bridge floor of the newly-built cable-stayed bridge, the tire type gantry crane system can be adopted to dismantle the existing bridge 1.
In the construction method, the cable-stayed bridge is adopted as the newly-built bridge 2, the construction scheme of lifting the existing bridge 1 and pushing the newly-built bridge 2 is adopted, so that the construction of the newly-built bridge 2 and the removal of the existing bridge 1 are synchronously carried out, and the removal of the existing bridge 1 is carried out on the bridge floor of the newly-built cable-stayed bridge; different from the method of dismantling the existing bridge 1 and then building a new bridge in the prior art, the dismantling of the existing bridge 1 and the construction of the new bridge are synchronously carried out in the embodiment of the application; by adopting the construction method, the structural stress system of the existing bridge 1 does not need to be changed in the process of dismantling the existing bridge 1, and the mechanical model is simple and reliable; the steel main beam 24 of the newly built bridge 2 is used as a bridge dismantling platform, so that the bridge dismantling platform is safe and reliable, and the safety risk that the existing bridge 1 passes through an existing line in a pushing mode is greatly avoided; the construction of the newly built bridge 2 and the removal of the existing bridge 1 can be carried out synchronously, so that the construction period can be shortened; the newly built bridge 2 and the existing bridge 1 are dismantled and built into a whole, and only the newly built bridge 2 is pushed, so that the key point time of the over-the-railway construction can be greatly reduced, the influence on railway transportation is reduced, and the investment is saved; therefore, the construction method has the characteristics of easy construction, safety, reliability, short construction period, construction cost saving and reduction of influence on railway transportation.
In a specific embodiment, as shown in fig. 6 and fig. 7, before the girder 24 of the newly-built cable-stayed bridge is constructed by pushing, the bridge construction method may further include setting up a girder splicing platform 6, where the girder splicing platform 6 is used to weld multiple sections of steel box girders to form the girder 24; the beam splicing platform 6 can be erected at any end of the newly-built bridge 2; the multiple sections of steel box girders forming the steel main girder 24 can be prefabricated and then spliced after being transported to a construction site, so that the prefabricated multiple sections of steel box girders are spliced on site by other fixed connection methods such as welding and the like; the steel main beam 24 is divided into a plurality of sections of steel box beams for split prefabrication, so that manufacturing and transportation are facilitated, and hoisting on a construction site is facilitated;
meanwhile, after the steel main beam 24 of the newly-built cable-stayed bridge is constructed in a pushing manner, the beam splicing platform 6 can be detached.
In order to facilitate the construction of the newly-built cable-stayed bridge, the tower crane 4 is further arranged on the construction site, and the assembling of the tower crane 4 can be carried out before the construction of the tower foundation 21, the newly-built bridge pier 22, the bridge tower 23 and the temporary pier 27 of the newly-built cable-stayed bridge.
In the process of constructing a newly-built cable-stayed bridge, as shown in the structure of fig. 6, the tower columns of the bridge tower 23 can be constructed by adopting a climbing formwork process, the tower columns can comprise a lower tower column and an upper tower column, and a lower cross beam 26 for supporting a steel main beam 24 is further arranged between the two tower columns; the lower beam 26 is constructed by a vertical mold casting process.
On the basis of various embodiments of the bridge construction method, the length of the steel box girder for assembling and manufacturing the steel main girder 24 can be 10m to 15m, such as: 10m, 11m, 12m, 13m, 14m and 15m, and preferably a steel box girder with the length of 12m is adopted for splicing the steel main girder 24; in the process of splicing and welding the steel main beams by the steel box beams, the steel box beams can be hoisted by a 300t gantry crane for splicing, and the steel main beams 24 are subjected to continuous pushing construction by a pushing method.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A bridge construction method integrating demolition and construction is characterized by comprising the following steps:
building a protective shed frame, a construction access road and a temporary support under a bridge;
removing the middle two-hole simple supporting arch and the approach bridge of the existing bridge in situ;
constructing a tower foundation, a newly-built pier, a bridge tower and a temporary pier of the newly-built cable-stayed bridge;
the method comprises the following steps of (1) performing width binding and heightening treatment on existing piers of an existing bridge, and installing a fixed type lifting beam portal frame on the tops of the existing piers;
lifting the existing bridge to a preset height through a fixed type lifting beam portal frame;
carrying out incremental launching construction on a steel main beam of the newly-built cable-stayed bridge;
installing a stay cable of the cable-stayed bridge;
lowering the existing bridge to a steel main beam of a newly-built cable-stayed bridge;
and (4) dismantling the existing bridge and the fixed type lifting beam portal frame.
2. The bridge construction method according to claim 1, further comprising the step of building a girder splicing platform before the incremental launching construction of the steel girder of the newly-built cable-stayed bridge, wherein the girder splicing platform is used for welding a plurality of sections of steel box girders to form the steel girder;
after the steel main beam of the newly-built cable-stayed bridge is constructed in a pushing mode, the beam splicing platform is detached.
3. The bridge construction method according to claim 2, further comprising assembling a tower crane before constructing the tower foundation, the newly-built bridge pier, the bridge tower and the temporary pier of the newly-built cable-stayed bridge.
4. The bridge construction method according to claim 3, wherein the tower columns of the bridge tower are constructed using a creeping formwork process.
5. The bridge construction method according to claim 4, wherein the lower beam of the bridge tower is constructed by a vertical mold casting process.
6. The bridge construction method according to claim 2, wherein the length of the steel box girder is 10m to 15 m.
7. The bridge construction method according to claim 2, wherein the steel main beam is constructed by adopting a gantry splicing and jacking method.
8. The bridge construction method according to claim 1, wherein the existing bridge is dismantled using a tire type gantry crane system.
9. The method for constructing a bridge according to claim 8, wherein in the dismantling of the existing bridge and the fixed type girder gantry, the existing bridge is dismantled directly on the deck of the newly-built cable-stayed bridge.
10. The bridge construction method of any one of claims 1 to 9, wherein the fixed beam gantry comprises a gantry upright, a gantry beam and a gantry lifting system;
the bottom end of the portal upright post is supported at the top of the existing pier.
CN202010388210.8A 2020-05-09 2020-05-09 Bridge construction method integrating dismantling and construction Active CN111593665B (en)

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