CN114150586A - Wave-shaped steel web continuous box girder bridge segment suspension casting asynchronous construction method - Google Patents
Wave-shaped steel web continuous box girder bridge segment suspension casting asynchronous construction method Download PDFInfo
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- CN114150586A CN114150586A CN202111522945.6A CN202111522945A CN114150586A CN 114150586 A CN114150586 A CN 114150586A CN 202111522945 A CN202111522945 A CN 202111522945A CN 114150586 A CN114150586 A CN 114150586A
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- 238000010276 construction Methods 0.000 title claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 239000000725 suspension Substances 0.000 title claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 238000011065 in-situ storage Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
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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
-
- 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
Abstract
The invention provides a corrugated steel web continuous box girder bridge segment suspension casting asynchronous construction method, which comprises the steps of lifting a 1# segment U-shaped prefabricated structure to a 0# segment cantilever after a 0# segment is cast in situ, and reinforcing and welding; then carrying out wet joint and residual height bottom plate concrete pouring construction; then pouring 1# segment top plate concrete; lifting the 2# section U-shaped prefabricated structure to a 1# section cantilever, welding corrugated steel webs on two sides, and performing wet joint and residual height bottom plate concrete pouring construction; and (5) circularly performing other segment construction, finishing the rest construction until the closure, and performing prestress tensioning after the full-bridge closure. According to the invention, the semi-prefabricated assembled bottom plate replaces a cast-in-place concrete bottom plate, and an asynchronous construction method is adopted, so that a plurality of operation surfaces are increased, the engineering period is effectively shortened, and in addition, the prefabricated assembled construction can effectively reduce high-altitude construction operation, reduce the construction safety risk and save the cost.
Description
Technical Field
The invention belongs to the technical field of bridge construction and particularly relates to a suspension casting asynchronous construction method for a corrugated steel web continuous box girder bridge section.
Background
The corrugated steel web concrete composite beam bridge adopts a steel web to replace a concrete web, and is a novel steel-concrete composite structure. During construction, the corrugated steel web box girder bridge usually adopts the construction method of traditional concrete bridge, for example support cast-in-place construction, cantilever pouring, top pushing construction etc. to lands such as plateau mountain area, the method of adopting cantilever construction is under construction usually, but among the prior art corrugated steel web box girder bridge cantilever pouring mostly adopts hanging basket class construction, hangs basket installation loaded down with trivial details in the work progress, and economic cost is higher, and the construction cycle is longer, the degree of difficulty is big scheduling problem needs to be solved urgently. Therefore, there is a need for improvements to existing construction methods.
Disclosure of Invention
In view of the above, the invention provides a suspension casting asynchronous construction method for a corrugated steel web continuous box girder bridge segment, aiming at overcoming the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a suspension casting asynchronous construction method for corrugated steel web continuous box girder bridge sections mainly comprises the following steps:
s1, manufacturing a U-shaped prefabricated structure;
s2, after the 0# segment is cast in situ, lifting the 1# segment U-shaped prefabricated structure to the 0# segment cantilever, temporarily fixing, adjusting the segment line shape to meet the design requirement, and then reinforcing and welding;
s3, carrying out wet joint between the 0# section concrete bottom plate and the 1# section concrete bottom plate and concrete pouring construction of the 1# section residual height bottom plate;
s4, erecting supports in the U-shaped prefabricated structure of the No. 1 segment and at the outer flange plates, paving templates, binding top plate steel bars and corrugated steel webs to be connected with the top plate steel bars, and pouring the concrete of the top plate of the No. 1 segment;
s5, lifting the U-shaped prefabricated structure of the 2# segment to the cantilever of the 1# segment, temporarily fixing, adjusting the line shape of the segment to meet the design requirements, and welding the corrugated steel webs on the two sides;
s6, carrying out wet joint between the 1# section concrete bottom plate and the 2# section concrete bottom plate and concrete pouring construction of the 2# section residual height bottom plate;
and S7, sequentially circulating according to the steps S4-S6, completing the construction of the rest N # segments (N > -2) until the segments are closed, and performing prestress tensioning after full-bridge closing.
Furthermore, each U type prefabricated construction all adopts the hoist crane to promote.
Furthermore, the hoisting points of the hoisting crane are hoisted by four points and are symmetrically arranged at the connecting positions of the two sides of the concrete bottom plate and the corrugated steel web.
Further, the hoisting points are arranged at the inner side positions of the joints of the concrete bottom plate and the corrugated steel web, and 2 hoisting points are arranged on each side of the concrete bottom plate.
Furthermore, when the U-shaped prefabricated structure is manufactured, the joint of the concrete bottom plate and the corrugated steel web plate is completely poured, and the bottom plate is poured to be partially high.
Further, the pouring height of the bottom plate during the manufacturing of the U-shaped prefabricated structure is obtained through finite element numerical simulation analysis calculation.
Compared with the prior art, the invention has the following advantages:
according to the invention, the semi-prefabricated assembled bottom plate replaces a cast-in-place concrete bottom plate, and an asynchronous construction method is adopted, so that a plurality of operation surfaces are increased, the engineering period is effectively shortened, in addition, the prefabricated assembled construction can effectively reduce the high-altitude construction operation, the construction safety risk is reduced, the investment of mechanical equipment and human resources is saved, and the engineering construction cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic view of a U-shaped prefabricated structure in the invention;
FIG. 2 is a schematic view of a wet seam section in accordance with the present invention;
fig. 3 is a schematic diagram of the invention when a U-shaped prefabricated structure is constructed by hoisting.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A suspension casting asynchronous construction method for a corrugated steel web continuous box girder bridge segment is shown in figures 1 to 3 and comprises the following steps:
firstly, manufacturing a U-shaped prefabricated structure 1;
specifically, when the 0# segment is poured, the suspension casting segment concrete bottom plate jig frames are manufactured on the ground, then corresponding segment concrete bottom plate reinforcing steel bars 3 and reinforcing steel bar binding connection between the bottom plate and the corrugated steel web 2 are performed on the finished segment concrete bottom plate jig frames, and the bottom plate concrete with the segment part height is poured, so that a U-shaped prefabricated structure with the segment concrete bottom plate 4 and the corrugated steel web stressed together is formed.
After the 0# section is cast in place, lifting the 1# section U-shaped prefabricated structure to a 0# section cantilever by using a crane, temporarily fixing the 0# section and the 1# section corrugated steel web by using high-strength bolts, adjusting the line shape, reinforcing and welding after meeting the design requirements, and then carrying out concrete pouring construction on a wet joint 5 between the 0# section concrete bottom plate and the 1# section concrete bottom plate and the residual height bottom plate of the 1# section;
then, erecting supports 6 in the U-shaped prefabricated structure of the No. 1 segment and at the outer flange plates, paving templates, binding top plate steel bars and corrugated steel webs to be connected with the top plate steel bars, and pouring the concrete of the top plate of the No. 1 segment to form a concrete top plate 7;
simultaneously, lifting the 2# segment U-shaped prefabricated structure to a 1# segment cantilever by using a crane 8, temporarily fixing the 1# segment and the 2# segment corrugated steel web by using a high-strength bolt, adjusting the line shape of the segment to meet the design requirement, and welding the corrugated steel webs at two sides; then carrying out wet joint between the concrete bottom plate of the No. 1 segment and the concrete bottom plate of the No. 2 segment and concrete pouring construction of the bottom plate with the residual height of the No. 2 segment;
and circulating the steps for constructing the U-shaped prefabricated structure, finishing the construction of the residual N # segment (N > ═ 2) until the segment is closed, and performing prestress tensioning after the full-bridge is closed.
The corrugated steel web continuous box girder bridge segment consists of a U-shaped prefabricated structure formed by prefabricating a corrugated steel web and a concrete bottom plate on a ground jig frame and a cast-in-place formed concrete top plate supported on the U-shaped prefabricated structure. And each U-shaped prefabricated structure is lifted by a crane. According to the construction method, the hoisting crane is used for replacing the construction hanging basket, the working planes are enlarged, the movement is flexible and convenient, the segmental corrugated steel web plate and the bottom plate are prefabricated on the ground, and the plurality of working planes are synchronously performed.
It should be noted that the hoisting points of the hoisting crane are hoisted by four points and symmetrically arranged at the joints of the two sides of the concrete bottom plate and the corrugated steel web. Preferably, the lifting points are arranged at the inner side position of the joint of the concrete bottom plate and the corrugated steel web plate, and 2 lifting points are arranged on each side of the concrete bottom plate.
Aiming at the problems of high construction requirement, high difficulty and safety risk of integrally prefabricated sections in the prior art, in the invention, when a U-shaped prefabricated structure is manufactured, the joint of a concrete bottom plate and a corrugated steel web plate is completely poured, the pouring height of the bottom plate is the partial height (the pouring height is usually 1/5-1/2 of the total height of the concrete bottom plate), and the pouring height of the bottom plate during prefabrication is obtained by finite element numerical simulation analysis calculation.
In an alternative embodiment, when the sections are butted, the butt joint structure can be erected on the concrete bottom plates which are preliminarily poured on the two adjacent sections, and then the concrete pouring is completed by secondarily pouring concrete on the two adjacent concrete bottom plates, so that the reliable connection function of the butt joint structure embedded between the two adjacent concrete bottom plates can be fully realized just by adopting the construction mode of preliminarily pouring and later completing the pouring of the residual height of the concrete bottom plates. For example, the butt joint structure may include a horizontally laid lap plate or a steel mesh, both ends of the lap plate or the steel mesh are respectively lapped on the concrete bottom plate on the corresponding side, when the concrete bottom plate is cast at the remaining height, a wet joint is synchronously constructed, and the butt joint structure and the combined structure of the wet joint are synchronously formed, so that the adjacent two sections are combined more firmly, the integrity of the adjacent two sections is ensured, the stress is better, the bearing capacity is stronger, and the butt joint structure is safer and more reliable.
According to the invention, the middle area of the concrete bottom plate is poured in layers, a part of the height bottom plate is poured when the U-shaped prefabricated structure is manufactured, the rest height is poured together at the wet joint between the construction section and the concrete bottom plate of the previous installed section, and the adopted secondary pouring mode effectively overcomes the defects that the post-pouring structure at the joint and the prefabricated structures at two sides are poor in combination degree and easy to crack when the fully prefabricated components in the prior art are spliced.
When the concrete bottom plate is prefabricated, the height of a pouring part can be reduced, the hoisting working strength can be reduced, the type selection of the hoisting crane is more flexible, the energy consumption is saved, and the cost is saved. And lighter prefabricated component can adopt littleer construction equipment to be under construction, and the operational environment limitation is little, has better adaptability, and the construction degree of difficulty reduces.
According to the construction method, the semi-prefabricated assembled bottom plate replaces a cast-in-place concrete bottom plate, an asynchronous construction method is adopted, a plurality of operation surfaces are increased, the engineering period is effectively shortened, in addition, the prefabricated assembled construction can effectively reduce high-altitude construction operation, the construction safety risk is reduced, the investment of mechanical equipment and human resources is saved, the engineering construction cost is reduced, and the economical efficiency is improved. Meanwhile, the prefabricated construction can effectively implement a green construction idea and reduce the environmental pollution caused by construction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (6)
1. A suspension casting asynchronous construction method for a corrugated steel web continuous box girder bridge segment is characterized by comprising the following steps:
s1, manufacturing a U-shaped prefabricated structure;
s2, after the 0# segment is cast in situ, lifting the 1# segment U-shaped prefabricated structure to the 0# segment cantilever, temporarily fixing, adjusting the segment line shape to meet the design requirement, and then reinforcing and welding;
s3, carrying out wet joint between the 0# section concrete bottom plate and the 1# section concrete bottom plate and concrete pouring construction of the 1# section residual height bottom plate;
s4, erecting supports in the U-shaped prefabricated structure of the No. 1 segment and at the outer flange plates, paving templates, binding top plate steel bars and corrugated steel webs to be connected with the top plate steel bars, and pouring the concrete of the top plate of the No. 1 segment;
s5, lifting the U-shaped prefabricated structure of the 2# segment to the cantilever of the 1# segment, temporarily fixing, adjusting the line shape of the segment to meet the design requirements, and welding the corrugated steel webs on the two sides;
s6, carrying out wet joint between the 1# section concrete bottom plate and the 2# section concrete bottom plate and concrete pouring construction of the 2# section residual height bottom plate;
and S7, sequentially circulating according to the steps S4-S6, completing the construction of the rest N # segments (N > -2) until the segments are closed, and performing prestress tensioning after full-bridge closing.
2. The asynchronous construction method for the cantilever casting of the corrugated steel web continuous box girder bridge segment according to claim 1, is characterized in that: and each U-shaped prefabricated structure is lifted by a crane.
3. The asynchronous construction method for the cantilever casting of the corrugated steel web continuous box girder bridge segment according to claim 2, is characterized in that: the hoisting points of the hoisting crane are hoisted by four points and are symmetrically arranged at the joints of the two sides of the concrete bottom plate and the corrugated steel web.
4. The asynchronous construction method for the cantilever casting of the corrugated steel web continuous box girder bridge segment according to claim 3, is characterized in that: the hoisting point is arranged at the inner side position of the joint of the concrete bottom plate and the corrugated steel web, and 2 hoisting points are arranged on each side of the concrete bottom plate.
5. The asynchronous construction method for the cantilever casting of the corrugated steel web continuous box girder bridge segment according to claim 1, is characterized in that: when the U-shaped prefabricated structure is manufactured, the joint of the concrete bottom plate and the corrugated steel web plate is completely poured, and the bottom plate is poured to be partially high.
6. The asynchronous construction method for the cantilever casting of the corrugated steel web continuous box girder bridge segment according to claim 5, is characterized in that: the pouring height of the bottom plate during the manufacturing of the U-shaped prefabricated structure is obtained through finite element numerical simulation analysis calculation.
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| CN202111522945.6A CN114150586A (en) | 2021-12-14 | 2021-12-14 | Wave-shaped steel web continuous box girder bridge segment suspension casting asynchronous construction method |
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| CN202111522945.6A CN114150586A (en) | 2021-12-14 | 2021-12-14 | Wave-shaped steel web continuous box girder bridge segment suspension casting asynchronous construction method |
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2021
- 2021-12-14 CN CN202111522945.6A patent/CN114150586A/en active Pending
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| CN101413247A (en) * | 2008-12-03 | 2009-04-22 | 中交公路规划设计院有限公司 | Streamline steel-concrete folding case beam |
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