CN116043699A - Construction method of steel truss girder arch bridge - Google Patents

Abstract

The invention relates to a construction method for a steel truss girder arch bridge, which comprises the following steps: erecting a main beam; erecting an assembling bracket and a lifting bracket on the main beam; assembling the assembled bracket to form an arch foot section and a central section; lifting the central section to a design height by the lifting brackets; and closing the arch leg sections and the central sections to form bridge arch ribs. The support is not required to be built or assembled, the cost of building the support is reduced, the passage of a channel or high-altitude assembly cannot be influenced, the application range is wider, and the safety is higher.

Description

Construction method of steel truss girder arch bridge

Technical Field

The invention relates to the field of bridge erection, in particular to a construction method of a steel truss girder arch bridge.

Background

At present, with the development of rapid construction technology of bridges, in the existing construction technology of the upper structure of the lower-bearing type steel arch and beam combined system bridge, a common construction method is to firstly utilize a pushing method or a cantilever frame to try to finish the construction of a steel main beam, and then construct the arch rib.

In the related art, the construction of the arch rib is mainly realized in two ways, one is realized by lifting the arch rib section through the lifting support of the landing pile, and the other is realized by erecting the splicing support on the main beam.

The mode that the support is lifted by the landing pile can influence the passage of a channel, the limitation is larger, the mode that the support is assembled can need high-altitude assembly, and the construction risk is larger. And the two construction modes are large in size, high in construction cost, complex in structure and high in construction difficulty.

Disclosure of Invention

The embodiment of the invention provides a construction method of a steel truss girder arch bridge, which aims to solve the problem of high limitation of a construction method of an arch rib in the related art.

In a first aspect, a construction method of a steel truss girder arch bridge is provided, which includes the following steps: erecting a main beam; erecting an assembling bracket and a lifting bracket on the main beam; assembling the assembled bracket to form an arch foot section and a central section; lifting the central section to a design height by the lifting brackets; and closing the arch leg sections and the central sections to form bridge arch ribs.

In some embodiments, the sectional brackets include a footing bracket and a center bracket; the assembling bracket is assembled to form the arch foot section and the arch rib central section, and the method comprises the following steps: assembling the arch leg support to form the arch leg section, and fixedly connecting the arch leg section with the main girder; -assembling the rib central sections at the central brackets.

In some embodiments, the lifting bracket comprises a first bracket and a second bracket which are arranged at intervals, the central section is lifted to a design height by the lifting bracket, and the method comprises the following steps: connecting a tensioning cable to both ends of the central section and tensioning the tensioning cable; connecting a first lifting device at the top of the first bracket with one end of the central section, and connecting a second lifting device at the top of the second bracket with the other end of the central section; the first lifting device and the second lifting device lift the central section simultaneously so that the central section reaches the designed height.

In some embodiments, after the bridge rib is formed by closing the toe segment with the center segment, the method of construction further comprises: the tensioning cables are removed from both ends of the central section.

In some embodiments, the first and second lifting devices lift the central section simultaneously, and the first and second lifting devices lift the central section in a staged loading manner.

In some embodiments, before the erecting the splicing bracket and the lifting bracket on the main beam, the construction method further includes the following steps: and weights are arranged at two ends of the main beam.

In some embodiments, after said closing the toe segment with the central segment to form a bridge rib, the method of construction further comprises: connecting one end of an arch rib suspender with the bridge arch rib, connecting the other end of the arch rib suspender with the main beam, and tensioning the arch rib suspender; and removing the weight.

In some embodiments, the erecting the main beam comprises the steps of: the side piers at two sides of the bridge are provided with jacks; two steel truss girder segments are formed by erecting the centers of the two lateral bridges of the bridge, the steel truss girder segments are supported on corresponding jacks, and the jacks jack the steel truss girder segments to close the two steel truss girder segments.

In some embodiments, the erecting from the center of the bridge to the two sides of the bridge forms two steel truss girder segments, including: a temporary support is erected between the side pier and the main pier; hoisting the steel truss girder rod piece to the temporary support; and assembling the steel truss girder rod pieces on the temporary supports to form the steel truss girder segments, wherein the steel truss girder segments are supported on the jacks at the tops of the side piers and the jacks at the tops of the main piers.

In some embodiments, closing the toe segment with the central segment to form a bridge rib includes the steps of: and assembling a closure segment in a gap between the arch foot segment and the central segment, wherein the closure segment connects the arch foot segment with the central segment.

The technical scheme provided by the invention has the beneficial effects that:

the embodiment of the invention provides a construction method of a steel truss girder arch bridge, because a lifting support is arranged above a bridge, the lifting support is not required to be arranged in water, the height of the lifting support is greatly reduced, the construction cost is reduced, and the construction of a channel is not influenced. And it accomplishes the erection of arch rib through the mode of promoting the festival section, can be with assembling the high reduction of support, compare the arch rib that forms through assembling completely, reduced the height of assembling, reduced the degree of difficulty of construction. Therefore, the high lifting support or the splicing support is not required to be built, the cost for building the support is reduced, the passage of a channel or the high-altitude splicing is not influenced, and the application range is wider.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a steel truss girder arch bridge provided by an embodiment of the present invention before a girder is erected;

FIG. 2 is a schematic view of a structure for erecting steel truss girder segments on temporary brackets according to an embodiment of the present invention;

FIG. 3 is a schematic view of a structure for erecting steel truss girder segments on main piers and side piers according to an embodiment of the present invention;

FIG. 4 is a schematic view of a structure for providing weights to steel truss girder segments according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a girder formed by joining girder segments according to an embodiment of the present invention;

fig. 6 is a schematic structural view of an arch springing segment and a central segment assembled on an assembled bracket according to an embodiment of the present invention;

FIG. 7 is a schematic view of a lifting bracket according to an embodiment of the present invention lifting a central section;

fig. 8 is a schematic structural diagram of a rear arch bridge of a tensioning boom according to an embodiment of the present invention.

1. A main beam; 11. steel truss girder segments;

2. assembling a bracket; 21. arch leg support; 22. a central support;

3. lifting the bracket; 31. a first bracket; 32. a second bracket;

41. arch foot segments; 42. a central section; 43. a closure section;

51. side piers; 52. a main pier; 53. a temporary support;

6. stretching a guy cable;

7. weighting;

8. arch rib suspender;

91. a jack; 92. and (5) temporarily shoveling the pad.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment of the invention provides a construction method of a steel truss girder arch bridge, which can solve the problem of high limitation of a construction method of an arch rib in the related art.

Referring to fig. 5 to 8, an embodiment of the present invention provides a construction method of a steel truss arch bridge, which may include the steps of:

erecting a main girder 1;

an assembling bracket 2 and a lifting bracket 3 are erected on the main beam 1;

assembling the assembled bracket 2 to form an arch foot section 41 and a central section 42;

lifting the central section 42 to a design height by means of the lifting brackets 3;

the abutment sections 41 are closed with the central section 42 to form bridge ribs.

That is, after the girder 1 is erected, the assembly bracket 2 and the lifting bracket 3 are all erected on the girder 1, compared with the situation that the lifting bracket 3 is arranged in water, the fixed point of the lifting bracket 3 erected on the girder 1 is raised, the total height of the lifting bracket 3 can be greatly reduced, and the erection of the lifting bracket 3 can not influence the passage of a channel because the lifting bracket 3 is not buried in a river channel. By assembling the arch leg segments 41 and the central segments 42 on the assembling bracket 2, the whole arch rib is not required to be directly assembled, the sectional construction can be realized, and the arrangement of the construction site is facilitated. When the central section 42 is assembled, the central section 42 is not required to be assembled with the arch foot section 41 integrally in the assembling process, so that the assembling height of the central section 42 can be reduced, the size of the assembled bracket 2 is reduced, the construction cost is reduced, high-altitude assembling is avoided, high-altitude construction is reduced, and the difficulty of construction is reduced. After the assembly of the arch foot sections 41 and the central sections 42 is completed, the central sections 42 are lifted to the designed height through the lifting brackets 3 arranged on the main beams 1, and bridge arch ribs can be formed by closing the arch foot sections 41 and the central sections 42, so that the construction of the arch ribs is completed. The present embodiment is particularly suitable for a single flexible arch rib, and positions two ends of a bridge arch rib by assembling arch leg sections 41, so that compared with lifting the whole single flexible arch rib, the problem of inaccurate positioning of two ends of the arch rib caused by deformation of the arch rib is avoided.

The splicing bracket 2 and the lifting bracket 3 are spliced in an auxiliary mode through a girder erection crane, and the splicing bracket 2 and the lifting bracket 3 can be detached after arch rib erection is finished for next construction.

Referring to fig. 6 and 7, in some alternative embodiments, the sectional frame 2 includes a leg frame 21 and a center frame 22;

the assembling of the arch springing segments 41 and the rib central segments 42 on the assembled bracket 2 comprises the following steps:

assembling the arch leg segments 41 at the arch leg brackets 21, and fixedly connecting the arch leg segments 41 with the main girder 1;

the rib center segments 42 are assembled at the center brackets 22.

That is, the arch springing segments 41 are assembled on the arch springing support 21, the central segments 42 are assembled on the central support 22, the construction of the central segments 42 and the arch springing segments 41 are independent of each other, the assembled arch springing segments 41 and the assembled central segments 42 can be simultaneously constructed, and the construction efficiency is improved. Or reasonably distributing construction equipment to complete related work according to the actual construction condition of the site. And when assembling the arch leg sections 41, the arch leg sections 41 are directly fixedly connected with the main girder 1 so as to avoid the position deviation of the arch rib when the arch rib is closed. In the assembling process, the auxiliary assembling can be realized by means of a girder erection crane. In this embodiment, the central section 42 has an axisymmetric structure, and when the central section 42 is lifted, the center of gravity of the central section 42 is on the center line in the length direction, so that the lifting is simpler, and the central section 42 is prevented from deflecting when the central section 42 is lifted later.

Referring to fig. 6 and 7, in some alternative embodiments, the lifting frame 3 includes a first frame 31 and a second frame 32 that are disposed at intervals, and the central section 42 is lifted to a design height by the lifting frame 3, which includes the following steps:

connecting a tensioning cable 6 to both ends of the central section 42 and tensioning the tensioning cable 6;

connecting a first lifting means at the top of the first bracket 31 to one end of the central section 42 and connecting a second lifting means at the top of the second bracket 32 to the other end of the central section 42;

the first and second lifting devices simultaneously lift the central section 42 to a design height of the central section 42.

For the single flexible arch rib, the rigidity of the arch rib is intersected, and deformation is easy to occur when the stress is uneven, in the embodiment, the central section 42 is lifted by means of lifting two ends at the same time, so that the lifting forces at two ends of the central section 42 are approximately the same as far as possible, and two ends of the central section 42 are connected by using the stay cable 6 before lifting, so that the two ends of the central section 42 are prevented from being relatively far away after lifting, and the central section 42 is prevented from being deformed. Facilitating subsequent closure of the central segment 42 to the toe segment 41. In this embodiment, the first lifting device includes a vertical lifting rope disposed on the first bracket 31, the top of the vertical lifting rope is connected to a jack disposed on the first bracket 31, and the bottom of the vertical lifting rope is connected to the central section 42. The central section 42 is lifted to a designed height by the jack pulling the vertical lifting rope, and the central section 42 is lifted simultaneously by the first lifting device and the second lifting device to avoid deflection during lifting.

Referring to fig. 6-8, in some alternative embodiments, after the rib segments 41 are formed into bridge ribs by closing the center segments 42, the construction method further includes:

the tensioning cables 6 are removed from both ends of the central section 42.

That is, the tensioning cable 6 is removed after the rib is closed, preventing the central segment 42 from being deformed by opening at both ends during closure. In this embodiment, the assembly bracket 2, the lifting bracket 3, and the first lifting device and the second lifting device disposed on the lifting bracket 3 are also removed after the arch rib is closed, where the arch rib can be closed to support the arch leg segment 41 by using the arch leg bracket 21, so as to ensure that the arch leg segment 41 is positioned accurately during the closing process.

Preferably, the first lifting device and the second lifting device lift the central section 42 at the same time, and the first lifting device and the second lifting device lift the central section 42 in a staged loading manner. That is, the lifting force is gradually increased by the step loading manner so that the final lifting force just satisfies the lifting of the central section 42, and the central section 42 is not unstable in the lifting process due to the excessive lifting force.

Referring to fig. 3 to 8, in some alternative embodiments, before the erection of the splicing stent 2 and the lifting stent 3 on the main girder 1, the construction method further includes the steps of:

weights 7 are arranged at two ends of the main beam 1.

The two ends of the main beam 1 are provided with the weights 7 so as to prevent the main beam from bending downwards due to the erection of the splicing bracket 2 and the lifting bracket 3. In this embodiment, weights 7 are disposed at two ends of the main beam 1 before the main beam 1 is closed, and the main beam 1 is closed by a girder erecting crane after the weights 7 are stabilized.

Referring to fig. 7 and 8, in some alternative embodiments, after the closing of the toe segment 41 with the central segment 42 to form a bridge rib, the construction method further includes:

connecting one end of an arch rib suspender 8 with the bridge arch rib, connecting the other end of the arch rib suspender with the main beam, and tensioning the arch rib suspender 8; the weight 7 is removed.

That is, after the rib boom 8 is installed and tensioned, the weight 7 is removed. The line shape of the main girder 1 is maintained by the tension of the arch rib suspender 8. And the deformation resistance of the single flexible arch rib is improved. The cable force of the rib boom 8 needs to be adjusted to a target value during the tensioning of the rib boom 8.

Referring to fig. 1 to 5, in some alternative embodiments, the erecting girder 1 comprises the steps of:

jacks 91 are arranged on the side piers 51 on two sides of the bridge;

two steel truss girder segments 11 are formed by erecting the center of the bridge from the two sides of the bridge, the steel truss girder segments 11 are supported on corresponding jacks 91,

the jack 91 lifts the steel truss girder segments 11, and the two steel truss girder segments 11 are closed.

That is, a jack 91 is provided to the side pier 51 during erection of the main girder 1, and the two steel girder segments 11 are closed by lifting the steel girder segments 11 by the jack 91. The difficulty of closure of the main girder 1 is reduced. In this embodiment, jacks 91 are provided on both the side piers 51 and the main piers 52, and the positions of the steel truss girder segments 11 can be adjusted by adjusting the jacks 91 during closure. In this embodiment, temporary shoveling pads 92 are further disposed on the side piers 51 and the main piers 52, and the support of the steel truss girder segments 11 after the lifting can be satisfied by adjusting the height of the temporary shoveling pads 92.

Referring to fig. 1 and 2, in some alternative embodiments, the two steel truss sections 11 are formed by erecting two steel truss sections from the two sides of the bridge to the center of the bridge, including:

a temporary support 53 is erected between the side pier 51 and the main pier 52;

hoisting the steel truss girder rod pieces to the temporary supports 53;

the steel truss girder members are assembled on the temporary supports 53 to form the steel truss girder segments 11, and the steel truss girder segments 11 are supported on the jacks at the top of the side piers 51 and the jacks at the top of the main piers 52.

That is, by splicing the steel girder segments 11 forming the bridge end on the temporary supports 53 until the steel girder segments 11 can be simultaneously supported on the side piers 51 and the main piers 52, the temporary supports 53 are removed, wherein the removed temporary supports 53 can be used for the next construction or for constructing the spliced brackets 2 or the lifting brackets 3, and the construction cost is reduced.

Referring to fig. 6-8, in some alternative embodiments, closing the toe segment 41 with the center segment 42 to form a bridge rib includes the steps of:

a closure segment 43 is formed by the assembly in the gap between the abutment segment 41 and the central segment 42, the closure segment 43 connecting the abutment segment 41 with the central segment 42. That is, closure is accomplished by splicing closure segments 43 at the gaps between adjacent segments, reducing the difficulty of closure as compared to not leaving gaps between adjacent segments.

The construction method of the steel truss girder arch bridge provided by the embodiment of the invention comprises the following principle:

by assembling the arch leg segments 41 and the central segments 42 on the assembling bracket 2, the linearity of the arch leg segments 41 and the central segments 42 can be ensured, and the assembling is not required to form a complete arch rib, so that the assembling construction height is reduced, and the construction safety is improved. Through the lifting support 3 that sets up on girder 1 promotes central section 42, can assemble the arch foot section 41 with central section and form the bridge arch rib, compare the lifting support that buries in water, shortened the height of lifting support by a wide margin, reduced construction cost, and can not cause the influence to shipping, application scope is wider.

In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present invention, 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. 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 invention. Thus, the present invention 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 (10)

1. The construction method of the steel truss girder arch bridge is characterized by comprising the following steps of:

erecting a main girder (1);

erecting an assembling bracket (2) and a lifting bracket (3) on the main beam (1);

-assembling the assembled brackets (2) to form a toe segment (41) and a central segment (42);

-lifting the central section (42) to a design height by means of the lifting brackets (3);

-closing the abutment section (41) with the central section (42) to form a bridge rib.

2. The method of constructing a steel truss arch bridge of claim 1, wherein:

the assembling bracket (2) comprises an arch support (21) and a central support (22);

the assembling bracket (2) is assembled to form an arch foot section (41) and an arch rib central section (42) and comprises the following steps:

assembling the arch leg support (21) to form the arch leg section (41), and fixedly connecting the arch leg section (41) with the main girder (1);

-assembling the rib central section (42) at the central bracket (22).

3. A method of constructing a steel truss arch bridge according to claim 1, wherein said lifting brackets (3) comprise first brackets (31) and second brackets (32) arranged at intervals, said lifting of said central section (42) to a design height by said lifting brackets (3) comprising the steps of:

connecting a tensioning cable (6) to both ends of the central section (42) and tensioning the tensioning cable (6);

connecting a first lifting device at the top of the first bracket (31) with one end of the central section (42) and connecting a second lifting device at the top of the second bracket (32) with the other end of the central section (42);

the first and second lifting means simultaneously lift the central section (42) to a design height of the central section (42).

4. A method of constructing a steel truss arch bridge in accordance with claim 3,

after closure of the toe segment (41) with the central segment (42) to form a bridge rib, the construction method further comprises:

-removing the tensioning cables (6) from both ends of the central section (42).

5. A method of constructing a steel truss arch bridge in accordance with claim 3,

the first lifting device and the second lifting device lift the central section (42) at the same time, and the first lifting device and the second lifting device lift the central section (42) in a staged loading mode.

6. A method of constructing a steel truss arch bridge according to claim 1, wherein prior to said erecting of the splice brackets (2) and lifting brackets (3) on the main beams (1), the method further comprises the steps of:

and weights (7) are arranged at two ends of the main beam (1).

7. A method of constructing a steel truss arch bridge according to claim 6, wherein after said closing of said toe section (41) with said center section (42) to form a bridge rib, said method of constructing further comprises:

one end of an arch rib suspender (8) is connected with the bridge arch rib, the other end of the arch rib suspender is connected with the main girder, and the arch rib suspender (8) is tensioned;

-removing said weight (7).

8. A method of constructing a steel truss arch bridge according to claim 1, wherein said erecting a main girder (1) comprises the steps of:

a jack (91) is arranged on each side pier (51) at two sides of the bridge;

two steel truss girder segments (11) are formed by erecting the center of the bridge from the two sides of the bridge, the steel truss girder segments (11) are supported on corresponding jacks (91),

the jack (91) lifts the steel truss girder segments (11) and closes the two steel truss girder segments (11).

9. A method of constructing a steel truss arch bridge according to claim 8, wherein said erecting two steel truss sections (11) from the center of the bridge on both sides of the bridge comprises:

a temporary support (53) is erected between the side pier (51) and the main pier (52);

hoisting the steel truss girder rod pieces to the temporary supports (53);

and assembling the steel truss girder rod pieces on the temporary supports (53) to form the steel truss girder segments (11), wherein the steel truss girder segments (11) are supported on the jacks at the tops of the side piers (51) and the jacks at the tops of the main piers (52).

10. The method of constructing a steel truss arch bridge of claim 1, wherein:

-closing the arch-foot section (41) with the central section (42) to form a bridge rib, comprising the steps of:

-joining a closure segment (43) in a gap between a footing segment (41) and the central segment (42), the closure segment (43) connecting the footing segment (41) with the central segment (42).

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