CN112030780B - Steel arch bridge cantilever erection method - Google Patents

Steel arch bridge cantilever erection method Download PDF

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Publication number
CN112030780B
CN112030780B CN202010839021.8A CN202010839021A CN112030780B CN 112030780 B CN112030780 B CN 112030780B CN 202010839021 A CN202010839021 A CN 202010839021A CN 112030780 B CN112030780 B CN 112030780B
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section
longitudinal movement
longitudinal
fixed section
fixed
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CN112030780A (en
Inventor
胡帆
刘生奇
周凌杰
敬成进
郭焕
李勇波
邓超
肖树康
付孟
汪一波
窦雪飞
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7th Engineering Co Ltd of MBEC
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7th Engineering Co Ltd of MBEC
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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
    • E01D21/10Cantilevered erection
    • 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
    • E01D4/00Arch-type bridges

Abstract

The application relates to a steel arch bridge cantilever erection method, wherein the steel arch bridge comprises a fixed section and a longitudinal movement section, and the method comprises the following steps: a tensioning mechanism is assembled at one end of the fixed section, which is far away from the longitudinal movement section, and is used for applying downward tensioning force to the fixed section; applying a first counterweight to an end of the fixed section remote from the longitudinal movement section; one end of the upward tensioning fixed section, which is close to the longitudinal moving section, is used for balancing the fixed section; a balance beam is arranged at one end of the longitudinal movement section far away from the fixed section; applying a second counterweight to the balance beam; one end of the longitudinal movement section close to the fixed section is tensioned upwards to balance the longitudinal movement section; and moving the longitudinal moving section along the longitudinal bridge direction to enable the fixed section and the longitudinal moving section to be jointed and form the steel arch bridge. The method greatly reduces the quantity and the quality of the counter weight on the bridge structure, reduces the damage of the main structure of the bridge, and solves the problem that the side span counter weight is insufficient due to the limitation of environmental conditions when the large-span steel truss arch cantilever is erected under the urban complex environment.

Description

Steel arch bridge cantilever erection method
Technical Field
The application relates to the technical field of bridge construction, in particular to a steel arch bridge cantilever erection method.
Background
At present, cantilever construction is the most main construction method of a steel arch bridge, and the cantilever construction adopts a cantilever assembling method. Firstly, dividing the steel arch bridge into a fixed section and a longitudinal movement section along the center line of the bridge, constructing a side-span steel beam at the fixed section, assembling the side-span steel beam by side-span steel beam sections, assembling a mid-span steel beam section to form a mid-span steel beam, and forming the fixed section by the side-span steel beam and the mid-span steel beam together; the longitudinal moving section is also constructed with side-span steel beams firstly, the side-span steel beams are formed by assembling side-span steel beam sections, then middle-span steel beam sections are assembled to form middle-span steel beams, the side-span steel beams and the middle-span steel beams form the longitudinal moving section together, and finally the longitudinal moving section moves towards the fixed section along the longitudinal bridge direction to be closed with the fixed section to form the steel arch bridge.
The mid-span steel beam is assembled by using a cantilever without a support, the mid-span overturning moment is generally very huge, the anchor fastening system cannot resist the overturning moment, and in order to ensure that the fixed section and the longitudinal moving section do not integrally overturn in the assembling process of the large cantilever mid-span steel beam, the overturning moment is mainly resisted by adopting a mode of counterweight of a heavy object on the side span steel beams of the fixed section and the longitudinal moving section.
However, if only a heavy object is adopted for balancing weight, a large number of weight balancing blocks are needed, and after the fixed section and the longitudinal moving section are closed, the removed balancing weight cannot be reused, so that the material consumption is huge. In addition, the installation of balancing weight is demolishd and is needed a large amount of manpowers and large-scale mechanical equipment cooperation, and construction cost is high, and the installation of balancing weight is demolishd construction cycle simultaneously and is longer, influences main part engineering efficiency of construction, and the hoist and mount installation is more with demolishd the uncertain safe risk factor, and a large amount of balancing weights also can cause certain damage to the girder steel structure simultaneously.
Disclosure of Invention
The embodiment of the application provides a steel arch bridge cantilever erection method to solve the problems that in the prior art, the use of a large number of balancing weights consumes manpower and material resources, influences the construction efficiency and damages the steel beam structure.
In a first aspect, a steel arch bridge cantilever erection method is provided, the steel arch bridge comprises a fixed section and a longitudinal movement section, and the method comprises the following steps:
a tensioning mechanism is assembled at one end of the fixed section, which is far away from the longitudinal movement section, and is used for applying downward tensioning force to the fixed section;
applying a first counterweight to an end of the fixed section distal from the longitudinal movement section;
tensioning one end of the fixed section close to the longitudinal moving section upwards to balance the fixed section;
a balance beam is arranged at one end of the longitudinal movement section far away from the fixed section;
applying a second counterweight to the balance beam;
tensioning one end of the longitudinal movement section close to the fixed section upwards to balance the longitudinal movement section;
and moving the longitudinal moving section along the longitudinal bridge direction to enable the fixed section and the longitudinal moving section to be jointed and form the steel arch bridge.
In some embodiments, the first weight includes a plurality of sets of first sub-weights; the fixed section comprises a first fixed section and at least one second fixed section which are distributed and connected along the longitudinal bridge direction and are close to the longitudinal moving section;
the balancing of the fixed section specifically comprises the steps of:
a tensioning mechanism is assembled on the first fixed section;
applying a set of first sub-weights on the first fixed section;
tensioning the first stationary section upwardly to balance the first stationary section;
hoisting one second fixed section to be connected with the first fixed section;
applying another set of first sub-weights on the first fixed section;
tensioning the second stationary section upwardly to balance the second stationary section;
and repeating the steps until all the second fixed sections are hoisted, so as to finish the construction of the fixed sections.
In some embodiments, the first weights comprise three sets of first sub-weights; the fixed section comprises a first fixed section and two second fixed sections.
In some embodiments, each set of the first sub-weights includes two first balancing weights symmetrically distributed along the longitudinal bridge direction.
In some embodiments, the second weight comprises a plurality of sets of second sub-weights; the longitudinal moving section comprises a first longitudinal moving section and at least one second longitudinal moving section which are distributed along the longitudinal bridge direction and are close to the fixed section and are connected with each other;
the balancing of the longitudinal movement section specifically comprises the following steps:
arranging a balance beam on the first longitudinal movement section;
applying a set of second sub-weights on the balance beam;
tensioning the first longitudinal movement section upwards to balance the first longitudinal movement section;
hoisting one second longitudinal movement section to be connected with the first longitudinal movement section;
applying another set of second sub-weights on the first longitudinal movement section;
tensioning the second longitudinal movement section upwards to balance the second longitudinal movement section;
and repeating the steps until all the second longitudinal movement sections are hoisted, so as to finish the construction of the longitudinal movement sections.
In some embodiments, the second weights comprise three sets of second sub-weights; the longitudinal movement section comprises a first longitudinal movement section and two second longitudinal movement sections.
In some embodiments, each set of the second sub-weights includes two second weights symmetrically distributed along the longitudinal bridge direction.
In some embodiments, the first rip fence is formed by splicing a plurality of rip fence segments; the shape of the balance beam is matched with that of the longitudinal movement section.
In some embodiments, the tensioning mechanism comprises:
the lengthening section is connected to the fixed section and is used for lengthening the fixed section;
the bottom end and the top end of the steel strand are respectively anchored on the side pier bearing platform and the extension section and used for tensioning the extension section;
a tensioning mechanism is assembled at one end of the fixed section, which is far away from the longitudinal movement section, and the method specifically comprises the following steps:
and applying downward tension force to the extension section by tensioning the steel strands so as to tension the fixed section.
In some embodiments, after moving the longitudinal shift section along the longitudinal bridge direction, the method further comprises the following steps:
and removing the tensioning mechanism, the balance beam, the first balance weight and the second balance weight.
The beneficial effect that technical scheme that this application provided brought includes: this application combines multiple counter weight mode, the quantity and the quality of the counter weight that have significantly reduced reduce, reduce bridge major structure damage to receive the environmental condition restriction and the not enough problem of side span counter weight when accomplishing under the city complex environment large-span steel truss arch cantilever erection.
The embodiment of the application provides a steel arch bridge cantilever erection method, which is carried out by matching with a sling tower frame, and a fixed section is balanced in a mode of arranging a tensioning mechanism at the fixed section and applying a first balance weight; balancing the longitudinal movement section by additionally arranging a balance beam on the longitudinal movement section and applying a second balance weight on the balance beam; finally, the closure of the fixed section and the longitudinal movement section is realized, and a steel arch bridge is formed, so that the quantity and the quality of the counter weight on the bridge structure are greatly reduced, the damage to the main structure of the bridge is reduced, and the problem of insufficient side-span counter weight due to the limitation of environmental conditions during the erection of the large-span steel truss arch cantilever under the urban complex environment is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a steel arch bridge cantilever erection method provided in an embodiment of the present application;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a sectional view taken along line B-B of FIG. 1;
fig. 4 is a sectional view taken along line C-C of fig. 1.
In the figure: 1. a fixed section; 2. longitudinally moving the section; 3. a tensioning mechanism; 30. a lengthening section; 31. steel strand wires; 4. a balance beam; 5. a first counterweight; 50. a first weight block; 6. a second counterweight; 60. a second counterweight block; 7. side pier cushion cap.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application provides a steel arch bridge cantilever erection method, the steel arch bridge is divided into a fixed section 1 and a longitudinal movement section 2 along a bridge center line, the fixed section 1 includes an edge-span steel beam and a middle-span steel beam, the longitudinal movement section 2 also includes an edge-span steel beam and a middle-span steel beam, and the erection method includes the following steps:
s1: and (3) balancing the fixed section 1, and the steps are as follows:
s10: a tensioning mechanism 3 is assembled at one end of the fixed section 1 far away from the longitudinal movement section 2, and the tensioning mechanism 3 is used for applying downward tensioning force to the fixed section 1; a part of the balance weight is borne by the tensioning mechanism 3 so as to reduce the use of the balance weight.
S11: applying a first counterweight 5 on the end of the fixed section 1 remote from the longitudinal movement section 2; if the tensioning mechanism 3 can completely replace a counterweight, the first counterweight 5 does not need to be applied to the fixed section 1, but the first counterweight 5 needs to be additionally applied because the steel arch bridge is a large-span bridge, but the quantity and the mass of the first counterweight 5 are greatly reduced, so that the damage to the fixed section 1 is greatly reduced; the overturning moment in the cantilever construction process of the fixed section 1 is counteracted through the tensioning mechanism 3 and the first balance weight 5, and the fixed section 1 is guaranteed not to be overturned integrally in the assembling process.
S12: one end of the fixed section 1 close to the longitudinal movement section 2 is upwards tensioned through the sling tower to balance the fixed section 1, so that the fixed section 1 is kept balanced integrally, overturning cannot happen between the assembled sections, and the line type of the fixed section 1 bridge is maintained.
S2: balancing the longitudinal movement section 2, comprising the following steps:
s20: and a balance beam 4 is arranged at one end of the longitudinal moving section 2 far away from the fixed section 1, and the balance beam 4 can bear a part of balance weight so as to reduce the use of the balance weight.
S21: applying a second counterweight 6 on the balance beam 4; the second counter weight 6 is applied to the balance beam 4 and not applied to the longitudinal movement section 2, so that the damage of the second counter weight 6 to the longitudinal movement section 2 can be reduced, and the strength of the longitudinal movement section 2 is ensured. The overturning moment in the cantilever construction process of the longitudinal movement section 2 is counteracted through the balance beam 4 and the second balance weight 6, and the longitudinal movement section 2 is guaranteed not to be overturned integrally in the assembling process.
S22: one end of the longitudinal movement section 2 close to the fixed section 1 is upwards tensioned through the sling tower frame to balance the longitudinal movement section 2, so that the longitudinal movement section 2 is integrally kept balanced, overturning cannot happen between all assembled sections, and the line type of the bridge of the longitudinal movement section 2 is maintained.
S3: and moving the longitudinal moving section 2 along the longitudinal bridge direction to enable the fixed section 1 and the longitudinal moving section 2 to be jointed and form the steel arch bridge. And after the construction of the fixed section 1 and the longitudinal movement section 2 is finished, closing to obtain the bridge-forming linear steel arch bridge.
S4: and removing the tensioning mechanism 3, the balance beam 4, the first balance weight 5 and the second balance weight 6.
In the embodiment of the present application, step S1 and step S2 are not sequential and may be performed simultaneously. The steel arch bridge cantilever erection method is carried out in cooperation with a sling tower frame, the fixed section 1 is balanced in a mode that a tensioning mechanism 3 is arranged on the fixed section 1 and a first counter weight 5 is applied, the number and the quality of the counter weights on the fixed section 1 are greatly reduced, and the damage to a main structure of a bridge is reduced; the longitudinal movement section 2 is balanced by additionally arranging the balance beam 4 on the longitudinal movement section 2 and applying the second counter weight 6 on the balance beam 4, the number and the mass of the counter weights on the longitudinal movement section 2 are greatly reduced, and the damage to the main structure of the bridge is reduced; finally, closure of the fixed section 1 and the longitudinal moving section 2 is achieved, and a steel arch bridge is formed, so that the problem that the side span counterweight is insufficient due to limitation of environmental conditions when a large-span steel truss arch cantilever is erected under the urban complex environment is solved. This application embodiment combines multiple counter weight mode, when satisfying the cantilever erection side span girder steel counter weight of stride steel truss arch bridge greatly, the conversion of better adaptation steel truss arch cantilever erection in-process system.
Referring to fig. 2-4, further, the first counterweight 5 includes a plurality of sets of first sub-counterweights; the fixed section 1 comprises a first fixed section and at least one second fixed section which are distributed and connected along the longitudinal bridge direction and are close to the longitudinal moving section 2;
the balancing fixed segment 1 in the step S1 specifically includes the following steps, that is, the specific steps of S10-S12:
s100: a tensioning mechanism 3 is assembled on the first fixed section; wherein first fixed segment is the side span girder steel, is connected the side span girder steel with side pier cushion cap 7 through straining device 3 to the side span girder steel exerts decurrent tension.
S101: and applying a group of first sub-weights on the first fixed section to prevent the first fixed section from overturning.
S102: the first stationary section is tensioned upwardly by the sling tower to balance the first stationary section such that the first stationary section maintains an overall linear structure.
S103: one of the second fixed sections is hoisted to be connected with the first fixed section, the second fixed section is a midspan steel beam section, the weight of the beam body is increased after the second fixed section is hoisted, and the overturning moment is also increased.
S104: and applying another group of first sub-weights on the first fixed section, and resisting the overturning moment of the beam body formed by the first fixed section and the second fixed section through the first sub-weights.
S105: the second fixed section is tensioned upwards through the sling tower frame to balance the second fixed section, so that the first fixed section and the second fixed section are connected and then keep an integral linear structure.
S106: by analogy, all the second fixed sections are hoisted to complete the construction of the fixed section 1, and the danger that the fixed section 1 is overturned integrally is prevented.
Further, the first balance weight 5 includes three sets of first sub-weights; the fastening section 1 comprises a first fastening section and two second fastening sections. According to the span length of steel arch bridge, divide into a plurality of segmentations with canned paragraph 1, first canned paragraph is the side span girder steel, and the second canned paragraph is midspan girder steel segmental, forms canned paragraph 1 after two midspan girder steel segmental segments and the side span girder steel hoist and mount construction.
Furthermore, each set of first sub-weights includes two first weights 50 symmetrically distributed along the longitudinal bridge direction to ensure the balance of the transverse bridge direction.
Referring to fig. 2-4, further, the second counterweight 6 includes a plurality of sets of second sub-counterweights; the longitudinal moving section 2 comprises a first longitudinal moving section and at least one second longitudinal moving section which are distributed along the longitudinal bridge direction and are close to the fixed section 1 and are connected with each other;
the balancing longitudinal shift section 2 in the step S2 specifically includes the following steps, that is, the specific steps of S20-S22:
s200: a balance beam 4 is arranged on the first longitudinal movement section; wherein the first longitudinal movement section is an edge-span steel beam, and the balance beam 4 is arranged on the edge-span steel beam to replace part of the balance weight applied to the edge-span steel beam.
S201: a set of second sub-weights is applied to the balance beam 4 to prevent the first longitudinal movement section from overturning.
S202: the first longitudinal movement section is tensioned upwards through the sling tower frame to balance the first longitudinal movement section, so that the first longitudinal movement section keeps an integral linear structure.
S203: and hoisting one of the second longitudinal movement sections to be connected with the first longitudinal movement section, wherein the second longitudinal movement section is a midspan steel beam section, the weight of the beam body is increased after the second longitudinal movement section is hoisted, and the overturning moment is also increased.
S204: and applying another group of second sub-weights on the first longitudinal movement section, and resisting the overturning moment of the beam body formed by the first fixed section and the second fixed section through the second sub-weights.
S205: and tensioning the second longitudinal movement section upwards to balance the second longitudinal movement section, so that the first longitudinal movement section and the second longitudinal movement section are connected and then keep an integral linear structure.
S206: and analogizing until all the second longitudinal movement sections are hoisted to complete the construction of the longitudinal movement section 2, and preventing the longitudinal movement section 2 from being overturned integrally.
Further, the second balance weight 6 includes three sets of second sub-weights; the longitudinal movement section 2 comprises a first longitudinal movement section and two second longitudinal movement sections. According to the span length of the steel arch bridge, the longitudinal movement section 2 is divided into a plurality of sections, the first longitudinal movement section is an edge-span steel beam, the second longitudinal movement section is a mid-span steel beam section, and the longitudinal movement section 2 is formed after the hoisting construction of the two mid-span steel beam sections and the edge-span steel beam.
Further, each set of second sub-weights includes two second weights 60 symmetrically distributed along the longitudinal bridge direction to ensure the balance of the transverse bridge direction.
Preferably, the first longitudinal movement section is formed by splicing a plurality of longitudinal movement section sections; the shape of the balance beam 4 is matched with the shape of the longitudinal shift section. The balance beam 4 is equivalent to one and indulges the section of moving, and balance beam 4 with indulge to move and be connected between the section and just be equivalent to two and indulge and move the connection between the section, can adopt the same connecting piece, need not additionally to increase other connecting pieces again, practice thrift construction cost greatly, increase efficiency of construction.
Preferably, the tensioning mechanism 3 comprises an extension section 30 and a steel strand 31, the extension section 30 is connected to the fixed section 1 and is used for extending the fixed section 1, and the end of the fixed section 1 has no space for the steel strand 31 to connect, and the extension section 30 is added to prevent the tensioning mechanism 3 from damaging the fixed section 1; the bottom end and the top end of the steel strand 31 are anchored on the side pier bearing platform 7 and the extension section 30 respectively and used for tensioning the extension section 30, and downward tensioning force is applied to the fixed section 1 through the tensioning steel strand 31 to replace part of counterweight functions.
Step S10 is to assemble a tensioning mechanism 3 at one end of the fixed section 1 away from the longitudinal movement section 2, and specifically includes the following steps:
a downward tensile force is applied to the long section 30 by the tensile steel strand 31 to tension the fixed section 1. The tensioning force of steel strand 31 is related to the size of side pier cushion cap 7, and the cushion cap is big more, and the tensioning force is big more, exerts the biggest tensioning force through steel strand 31, and the whole fixed segment 1 is balanced to the rethread is exerted first counter weight 5, can reduce the use of counter weight in the at utmost, reduces bridge major structure damage.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, 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 present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A steel arch bridge cantilever erection method, this steel arch bridge includes fixed section (1) and moves about section (2) longitudinally, characterized by that, it includes the following steps:
a tensioning mechanism (3) is assembled at one end of the fixed section (1) far away from the longitudinal movement section (2), and the tensioning mechanism (3) is used for applying downward tension to the fixed section (1);
applying a first counterweight (5) to the end of the fixed section (1) remote from the longitudinal movement section (2);
tensioning one end of the fixed section (1) close to the longitudinal moving section (2) upwards through a sling tower to balance the fixed section (1);
a balance beam (4) is arranged at one end of the longitudinal movement section (2) far away from the fixed section (1);
-applying a second counterweight (6) on the balance beam (4);
tensioning one end of the longitudinal movement section (2) close to the fixed section (1) upwards through a sling tower frame to balance the longitudinal movement section (2);
moving the longitudinal moving section (2) along the longitudinal bridge direction to enable the fixed section (1) and the longitudinal moving section (2) to be jointed and form the steel arch bridge;
the second counterweight (6) comprises a plurality of groups of second sub-counterweights; the longitudinal moving section (2) comprises a first longitudinal moving section and at least one second longitudinal moving section which are distributed along a longitudinal bridge direction and are close to the fixed section (1) and are connected with each other;
the balancing of the longitudinal movement section (2) comprises the following steps:
a balance beam (4) is arranged on the first longitudinal movement section;
-applying a set of second sub-weights on the balance beam (4);
tensioning the first longitudinal movement section upwards through a sling tower to balance the first longitudinal movement section;
hoisting one second longitudinal movement section to be connected with the first longitudinal movement section;
applying another set of second sub-weights on the first longitudinal movement section;
tensioning the second longitudinal movement section upwards through a sling tower to balance the second longitudinal movement section;
and analogizing until all the second longitudinal movement sections are hoisted, so as to finish the construction of the longitudinal movement sections (2).
2. The steel arch bridge cantilever erection method of claim 1, wherein the first counterweight (5) comprises a plurality of sets of first sub-counterweights; the fixed section (1) comprises a first fixed section and at least one second fixed section which are distributed along the longitudinal bridge direction and are close to the longitudinal moving section (2) and are connected with each other;
the balancing of the fixed section (1) comprises in particular the following steps:
a tensioning mechanism (3) is assembled on the first fixed section;
applying a set of first sub-weights on the first fixed section;
tensioning the first stationary section upwardly through a sling tower to balance the first stationary section;
hoisting one second fixed section to be connected with the first fixed section;
applying another set of first sub-weights on the first fixed section;
tensioning the second stationary section upwardly through a sling tower to balance the second stationary section;
and analogizing until all the second fixed sections are hoisted so as to finish the construction of the fixed section (1).
3. A steel arch bridge cantilever erection method according to claim 2, wherein said first counterweight (5) comprises three sets of first sub-counterweights; the fastening section (1) comprises a first fastening section and two second fastening sections.
4. A method for erecting a steel arch bridge according to claim 2, wherein each set of said first sub-weights comprises two first weights (50) symmetrically distributed along the longitudinal bridge direction.
5. A method for cantilever erection of a steel arch bridge as claimed in claim 1, wherein said second counterweight (6) comprises three sets of second sub-counterweights; the longitudinal movement section (2) comprises a first longitudinal movement section and two second longitudinal movement sections.
6. A method for erecting a steel arch bridge according to claim 1, wherein each set of said second sub-weights comprises two second weights (60) symmetrically distributed along the longitudinal bridge direction.
7. A method for erecting a steel arch bridge cantilever according to claim 1, wherein the first longitudinally-shifted section is formed by splicing a plurality of longitudinally-shifted section segments; the shape of the balance beam (4) is matched with that of the longitudinal movement section.
8. The steel arch bridge cantilever erection method of claim 1, wherein the tension mechanism (3) comprises:
an extension section (30) connected to the fixed section (1) and used for extending the fixed section (1);
the bottom end and the top end of the steel strand (31) are respectively anchored on the side pier bearing platform (7) and the extension section (30) and used for tensioning the extension section (30);
a tensioning mechanism (3) is assembled at one end of the fixed section (1) far away from the longitudinal movement section (2), and the method specifically comprises the following steps:
applying a downward tensioning force to the lengthened section (30) by tensioning the steel strand (31) to tension the fixed section (1).
9. A method for erecting a steel arch bridge cantilever according to claim 1, wherein after moving the longitudinal shift section (2) in the longitudinal bridge direction, further comprising the steps of:
and removing the tensioning mechanism (3), the balance beam (4), the first balance weight (5) and the second balance weight (6).
CN202010839021.8A 2020-08-19 2020-08-19 Steel arch bridge cantilever erection method Active CN112030780B (en)

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CN112482248A (en) * 2020-12-04 2021-03-12 中铁北京工程局集团第二工程有限公司 Construction method of large-span arch stiffened asymmetric-section continuous beam
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