CN113652947A - Combined arch segment structure, bridge and construction method - Google Patents

Abstract

The invention provides a combined arch segment structure, a bridge and a construction method, relates to the technical field of bridge engineering, and aims to solve the problems that the existing stiffened skeleton arch bridge adopts a concrete-wrapped skeleton to cooperatively bear force, the stress state of the whole structure is complex, and the risk of web cracking exists; the truss structure formed by the web members is adopted to replace a concrete web, the stress of the whole structure is clear, the prefabricated assembly construction can be carried out, and the stress analysis and the later maintenance are convenient to carry out; comprises a middle box and a side box which are respectively connected with the two sides of the middle box; the side box comprises arch bars, chord members and web members, at least two arch bars are sequentially arranged at intervals and in parallel, at least two chord members are sequentially embedded in each arch bar, and a plurality of web members are connected between the chord members which are opposite in the adjacent arch bars so as to form a truss structure; be connected with intermediate lamella and many first studdles between two limit casees that same well case corresponds, the arch bar of different limit casees is connected at intermediate lamella both ends, and the intermediate lamella is coplane with the arch bar of connecting.

Description

Combined arch segment structure, bridge and construction method

Technical Field

The disclosure relates to the technical field of bridge engineering, in particular to a combined arch segment structure, a bridge and a construction method.

Background

The stiff skeleton arch bridge has good stress performance, the concrete stiff skeleton arch bridge is one of main bridge selection types of a large-span bridge, and the steel pipes in the concrete composite body have the functions of longitudinal steel bars and transverse stirrups, so that the stiff skeleton arch bridge can bear pressure and tension.

The traditional concrete arch bridge with the stiffened framework externally wrapped still has some problems, for the large-span concrete arch bridge with the stiffened framework, the large-span concrete arch bridge is usually applied to the construction condition of crossing a river or crossing a river, two sides of the concrete arch bridge work and are respectively poured on mountain bodies at two sides of a river trunk or a river channel, a half-span arch ring is longer in length, inconvenient to transport between mountains, high in construction difficulty and certain in safety risk, therefore, the concrete arch bridge is formed by ring division and section division during construction, but concrete is wrapped outside the framework, the concrete wrapped framework is stressed in a cooperative mode in the construction process and the use process, the whole structure is complex in stress state, the risk of web cracking exists, and stress analysis and risk prediction are difficult to be carried out on stress concentration positions of the concrete arch bridge.

Disclosure of Invention

The utility model aims at the defects that exist in the prior art, a combination arch segment structure, a bridge and a construction method are provided, a steel web member is adopted to replace a concrete web plate, the stress of the whole structure is clear, the stress analysis and the later maintenance are convenient to carry out, and the construction of large segment prefabrication assembly hoisting can be carried out due to the reduction of the structure weight.

The first purpose of the present disclosure is to provide a combined arch segment structure, which adopts the following technical solutions:

comprises a middle box and a side box which are respectively connected with the two sides of the middle box; the side box comprises arch bars, chord members and web members, at least two arch bars are sequentially arranged at intervals and in parallel, at least two chord members are sequentially embedded in each arch bar, and a plurality of web members are connected between the chord members which are opposite in the adjacent arch bars so as to form a truss structure; be connected with intermediate lamella and many first studdles between two limit casees that same well case corresponds, the arch bar of different limit casees is connected at intermediate lamella both ends, and the intermediate lamella is coplane with the arch bar of connecting.

Furthermore, the chord axes arranged in the corresponding arch boards of the same side box are arranged in parallel, and the web member connecting chord members are combined with the arch boards to form a box structure with a truss at the web plate.

Furthermore, a first inclined strut is connected between the web members corresponding to the adjacent chords in the same arch bar, and the end part of the first inclined strut is connected to the side surface of the web member and is close to the arch bar.

Furthermore, a second cross brace is arranged at the position where the first diagonal brace is connected with the web member, two ends of the second cross brace are respectively connected with the web member, and the axis of the second cross brace is perpendicular to the axis of the web member connected with the second cross brace.

Further, the web members include a first web member and a second web member; all first web members corresponding to the same chord member are arranged in parallel, and a second web member is connected between the adjacent first web members.

Further, the chord members are connected behind the end portions of the second web members in butt joint with the end portions of the first web members, the two ends of each second web member are connected to different chord members, and the second web members and the first web members are arranged at included angles.

Furthermore, the middle box comprises a plurality of middle plates, and the arch plates of one side box correspond to the arch plates of the other side box one by one and are connected through the middle plates.

Further, many first stull intervals and axis parallel arrangement between the side case are connected with the second bracing between the adjacent stull.

It is a third object of the present disclosure to provide a bridge constructed using the composite arch segment as described above.

A third object of the present disclosure is to provide a method of constructing a composite arch segment, comprising the steps of:

the method comprises the following steps that arch plates, chord members and web members are prefabricated in a factory, the chord members are embedded into the arch plates, the web members are connected between two arch plates which are arranged in parallel at intervals, the end parts of the web members are connected with the chord members, and a side box with a truss as a web plate and concrete as a top plate is formed;

the arch plates of the two side boxes are connected through the middle plate, the web members are connected through the first cross brace, and a middle box with a web as a truss and a top plate as concrete is formed between the two side boxes;

the side box and the middle box are integrally used as combined arch sections, arch rings are formed after the closure is sequentially butted from bottom to top, and other structures are built to form a bridge.

Compared with the prior art, the utility model has the advantages and positive effects that:

(1) aiming at the problems that the concrete is adopted to wrap the framework to cooperatively bear force, the stress state of the whole structure is complex, and the risk of web cracking exists in the existing stiff framework arch bridge; adopt the steel web member to replace the concrete web, the overall structure atress is clear and definite, conveniently carries out atress analysis and later maintenance, and because structure weight alleviates, can carry out the prefabricated assembly hoist and mount construction of big section.

(2) Compared with the traditional arch bridge with concrete wrapped outside the stiff skeleton, the steel web members are adopted to replace concrete webs, and only the steel web members need to be coated and maintained during later maintenance, so that the problem of cracking of the concrete webs is avoided; the prefabricated assembly construction is used, and the prefabricated steel plate is transported to a construction site for assembly only after being prefabricated in a factory, so that the high-altitude operation and the working procedures are fewer, the construction period is shortened, and the construction quality and the safety can be ensured.

(3) The construction method adopts a structure that the middle box and the side boxes on two sides are combined, firstly, the side boxes are constructed in parallel, and the construction method of forming the section by stages can obviously reduce the hoisting weight requirement under the condition that the length of the arch ring section is determined; in addition, the cross brace connecting structures between the parallel side boxes are stressed cooperatively, so that the arch forming can be stabilized, and after the arch forming, an intermediate plate is poured at the cross brace connecting positions to form a complete arch ring, so that the cooperative stress capability of the whole arch ring is further improved.

(4) Adopt web member to combine the chord member of arch bar and arch bar inside to constitute box section structure, guarantee holistic stability, increase the bracing between two relative web members and form the triangle-shaped structure, improve the sectional stability of box, the web member combination forms the triangle-shaped structure of arranging in proper order for the web position can stabilize the atress structure, and the triangle-shaped structure is convenient for subsequent mechanical analysis and maintenance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.

FIG. 1 is a schematic cross-sectional view of a composite arch segment configuration in embodiments 1, 2 of the present disclosure;

FIG. 2 is a schematic illustration of the splicing location of the composite arch segment construction in embodiments 1, 2 of the present disclosure;

fig. 3 is a schematic diagram of the combined arch cut-off structure in embodiments 1 and 2 of the present disclosure after splicing.

In the figure, 1-arch bar, 2-chord bar, 3-first web member, 4-second web member, 5-first cross brace, 6-second diagonal brace, 7-segment wet joint, 8-middle plate, 9-second cross brace, 10-first diagonal brace, 11-connecting pier, 12-bridge deck system, 13-arch base and 14-arch upright post.

Detailed Description

Example 1

In one exemplary embodiment of the present disclosure, a composite arch segment configuration is provided, as shown in fig. 1-3.

Aiming at the problems that the concrete is adopted to wrap the framework to cooperatively bear force, the stress state of the whole structure is complex, and the risk of web cracking exists in the existing stiff framework arch bridge; the combined arch segment structure is characterized in that a truss structure formed by the steel web members is adopted to replace a concrete web, the stress of the whole structure is clear, and the stress analysis and the later maintenance are convenient to carry out. And because the structure weight is lightened, the large-section prefabrication and assembly construction can be carried out.

The combined arch segment structure mainly comprises a middle box and side boxes, wherein the side boxes are connected to two sides of the middle box in the butt joint direction respectively, and as shown in fig. 1, a cross-sectional structure formed by sequentially butting the side boxes, the middle box and the side boxes is formed from left to right.

Side case and middle case atress in coordination, it corresponds the web position and is truss structure, compares in traditional strength nature skeleton outsourcing concrete arch bridge, adopts the truss that the steel member combination formed to replace the concrete web, and later stage maintenance only need carry out the application maintenance to the truss, has avoided the concrete web fracture problem.

For the side box structure, referring to fig. 1 and 2, the side box structure comprises arch bars 1, chords 2 and web members, wherein a plurality of arch bars 1 are sequentially arranged at intervals and in parallel, adjacent arch bars 1 are connected through a plurality of web members, in order to realize stable connection of the web members and the arch bars 1, the chords 2 are embedded in the arch bars 1, the end parts of the web members extend into the arch bars 1 to be connected with the chords 2, at least two chords 2 are sequentially embedded in each arch bar 1, and a plurality of web members are connected between the chords 2 which are opposite to each other in the adjacent arch bars 1; the web members are arranged in a plurality of rows, each row forms a truss web member structure, and the plurality of rows of truss structures are used as webs of the side boxes.

In this embodiment, take two arch bars 1, two chords 2 are installed in each arch bar as an example, the arch bars 1 are respectively used as a top plate and a bottom plate of a side box, a plurality of web members are connected between the chords 2 facing in the top plate and the bottom plate, and the two chords 2 of the top plate are connected with the two chords 2 in the bottom plate through two sets of web members to be used as a web structure.

Because the arch bars 1 are arranged in parallel, the internal chord members 2 are arranged in the splicing direction of the arch bars 1 and are parallel to each other, so that the planes of the two groups of truss web members are parallel. Two sets of truss web members are arranged at the end positions of the arch bar 1, thereby forming a box section structure.

In other embodiments, the number of the arch bars 1 may be increased, such as three, four, etc., each arch bar has a chord 2 embedded therein, and the chords 2 between adjacent arch bars 1 are connected by web members, so as to form a multi-chamber structure; other numbers of chords 2, such as four chords, six chords and the like, can be buried in each arch bar 1, and are determined according to the width of the arch bar 1, and the chords 2 in the adjacent arch bars 1 are connected through web members to form a multi-row truss structure.

For the arrangement of the inner chord 2 of the arch bar 1, the same side box is arranged in parallel corresponding to the axis of the chord 2 arranged in the arch bar 1, and the web member connecting chord 2 is combined with the arch bar 1 to form a box structure with a truss at the web plate position.

The side box section is the box, and in order to further improve the intensity of side box, be connected with first bracing 10 between the web member that adjacent chord member 2 corresponds in same arch bar 1, first bracing 10 end connection is in the web member side, and is close to arch bar 1 for the triangle-shaped structure is cut apart into to sectional box, further improves its stability.

Furthermore, a second cross brace 9 is arranged at the position where the first inclined brace 10 is connected with the web members, two ends of the second cross brace 9 are respectively connected with the web members, and the axis of the second cross brace 9 is perpendicular to the axis of the web members connected with the second cross brace.

The crossbrace can connect two sets of truss web members that arrange side by side, combines the bracing to form the triangle-shaped structure, improves its bearing capacity, satisfies the bearing capacity demand of big span arch bridge.

The chord members 2 in the adjacent arch slabs 1 are connected through web members, and each web member comprises a first web member 3 and a second web member 4; all the first web members 3 corresponding to the same chord member 2 are arranged in parallel, and the second web members 4 are connected between the adjacent first web members 3.

The end part of the second web member 4 is butted with the end part of the first web member 3 and then connected with the chord member 2, the two ends of the second web member 4 are connected with different chord members 2, and the second web member 4 and the first web member 3 are arranged at an included angle. The included angle ranges from 0 to 180 degrees.

On one hand, the second web members 4 are connected between the two parallel first web members 3 to form a triangular structure, so that the strength of the truss web members is improved; on the other hand, the first web member 3 and the second web member 4 are combined with the first inclined strut 10 to form a space triangular structure, and the first web member and the second web member are combined to form a triangular structure which is sequentially arranged, so that the stress structure can be stabilized at the web position, and the triangular structure is convenient for subsequent mechanical analysis and maintenance.

For the structure of center box, be connected with intermediate lamella 8 and many first stull 5 between two side casees that same center box corresponds, the arch bar 1 of different side casees is connected at intermediate lamella 8 both ends, and intermediate lamella 8 and the 1 coplanarity of arch bar connected, and intermediate lamella 8 combines the web member of side case to form box section structure, center box and side case sharing truss web member.

The middle box comprises a plurality of middle plates 8, the arch plates 1 of one side box correspond to the arch plates 1 of the other side box one to one, and the middle plates 8 are connected, so that the side boxes on two sides can be stressed in a coordinated mode, and the stability and the bearing capacity of the middle box are improved.

A plurality of first cross braces 5 between the side boxes are arranged at intervals and have parallel axes, and a second diagonal brace 6 is connected between adjacent cross braces; through stull combination bracing, form the skeleton texture of triangle-shaped structure amalgamation between intermediate lamella 8, improve the solid power of fixing of two side casees to improve the intensity of whole combination arch segment section.

It can be understood that, in the present embodiment, the thicknesses of the arch plates 1 and the middle plate 8 and the distance between the arch plates 1 are determined according to the actual engineering stress condition.

H-shaped steel can be selected for the chord member 2 and the web members, butt joint is achieved through welding, and the type selection and the specific length of the H-shaped steel are determined according to bridge design parameters and actual engineering stress conditions.

The first cross brace 5 and the second cross brace 9 can be made of I-shaped steel, and the specific size is determined according to the stress condition of the actual engineering.

The first inclined strut 10 and the second inclined strut 6 can adopt equal limb angle steel, and the specific size is determined according to the stress condition of the actual engineering.

The middle plate 8 can be made of concrete in a cast-in-place mode, the side boxes are arched firstly, and then the middle plate 8 is formed by casting concrete in the cast-in-place mode to improve the connection strength of the two side boxes.

The butt joint positions among the multiple combined arch segment structures adopt segment wet joints 7, and concrete can be poured into the joint positions after the internal chord members 2 are welded.

Example 2

In another embodiment of the present disclosure, as shown in fig. 1-3, a bridge is provided utilizing a composite arch segment construction as described in embodiment 1.

The arch structure of the bridge is formed by sequentially splicing a plurality of sections of combined arch segment structures, and other structures can be formed by adopting the existing bridge structure.

The detailed structure of the specific combined arch segment configuration is described in embodiment 1 and will not be described herein.

Compared with the traditional arch bridge with concrete wrapped outside the stiff skeleton, the steel web members are adopted to replace concrete webs, and only the steel web members need to be coated and maintained during later maintenance, so that the problem of cracking of the concrete webs is avoided; the prefabricated assembly construction is used, and the prefabricated steel plate is transported to a construction site for assembly only after being prefabricated in a factory, so that the high-altitude operation and the working procedures are fewer, the construction period is shortened, and the construction quality and the safety can be ensured.

Example 3

In yet another embodiment of the present disclosure, a method of constructing a composite arch segment is provided, as shown in fig. 1-2.

The method comprises the following steps:

the method comprises the following steps that arch plates 1, chord members 2 and web members are prefabricated in a factory, the chord members 2 are embedded into the arch plates 1, the web members are connected between two arch plates 1 which are arranged in parallel at intervals, the end parts of the web members are connected with the chord members 2, and a side box with a truss as a web plate and concrete as a top plate is formed;

the arch bars 1 of the two side boxes are connected through the middle plate 8, the web members are connected through the first cross brace 5, and a middle box with a web as a truss and a top plate as concrete is formed between the two side boxes;

the side box and the middle box are integrally used as combined arch sections, arch rings are formed after the closure is sequentially butted from bottom to top, and other structures are built to form a bridge.

With reference to fig. 1 and 2, in particular, the construction method of the combined arch segment includes the following steps:

(1) the construction of the arch support 13, the boundary pier 11, the cable crane anchor, the buckling tower frame, the cable system and the like is carried out according to the design requirements, meanwhile, the chord member 2, the web member, the cross brace and the diagonal member are processed in a factory and are all made of steel, the chord member 2 and the web member are combined to form a steel truss structure, and the connection relation of the chord member 2 and the web member is described in the embodiment 1.

(2) The upper chord 2 and the lower chord 2 of the steel truss framework are respectively embedded in the top arch springboard 1 and the bottom arch springboard 1, the arch springboards 1 are made of concrete materials, the connection of the concrete top arch springboard 1, the bottom arch springboard 1 and the steel truss framework is realized, and the second cross brace 9 and the first inclined brace 10 are welded between the vertical web members of the adjacent steel truss frameworks to form the side box rib arch segment as in embodiment 1, in the embodiment, the 1/2 main arch ring can be divided into 8 segments from arch springing to vault division.

(3) And after the factory prefabrication is finished, hoisting and assembling the side box sections. And hoisting the two side box arch rib sections I by the cable, connecting the first cross brace 5 and the second inclined brace 6 at the middle box, and tensioning the buckling cables at corresponding positions.

(4) And hoisting two side box arch rib sections II by using cables, connecting the upper chord member and the lower chord member 2 in the sections I and II, connecting a first cross brace 5 and a second diagonal brace 6 at the middle box of the sections II, and tensioning the corresponding position buckle cables.

(5) Hoisting two side box arch rib sections III by cables, connecting upper and lower chord rods 2 in the sections II and III, connecting a first cross brace 5 and a second diagonal brace 6 at a middle box of the sections III, tensioning the corresponding position buckling cables, and pouring joint concrete between the sections I and II to form section wet joints 7.

(6) And repeating the fourth step and the fifth step until the two side box arch ribs are closed.

(7) And pouring a transverse middle plate 8 of the middle box from bottom to top, and reinforcing the side box connecting structure to form a complete arch ring.

(8) The column 14 is arched during construction.

(9) An arch-over deck system 12 is constructed.

The structure that adopts well case and both sides limit case combination carries out the parallel construction of limit case earlier, connects stull structure atress in coordination between the parallel limit case, makes it can stabilize the arching, and after the arching, pours intermediate lamella 8 to its connection stull position, forms complete arch ring, further improves the atress ability in coordination of whole arch ring.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (10)

1. A combined arch segment structure is characterized by comprising a middle box and side boxes respectively connected with the two sides of the middle box; the side box comprises arch bars, chord members and web members, at least two arch bars are sequentially arranged at intervals and in parallel, at least two chord members are sequentially embedded in each arch bar, and a plurality of web members are connected between the chord members which are opposite in the adjacent arch bars so as to form a truss structure; be connected with intermediate lamella and many first studdles between two limit casees that same well case corresponds, the arch bar of different limit casees is connected at intermediate lamella both ends, and the intermediate lamella is coplane with the arch bar of connecting.

2. The composite arch segment construction of claim 1 wherein the chords of the same side box are arranged in parallel with respect to the axis of the chords arranged in the arch, and wherein the web connecting chords in combination with the arch form a box-like structure with trusses at the web.

3. The composite arch segment construction of claim 1 wherein a first brace is connected between the web members of adjacent chords in the same arch, the first brace having an end connected to a side of the web members adjacent the arch.

4. The composite arch segment structure of claim 3, wherein the first diagonal brace is provided with a second cross brace at the position where the web member is connected, the web member is connected to both ends of the second cross brace, and the axis of the second cross brace is perpendicular to the axis of the connected web member.

5. The composite arch segment configuration of claim 1 wherein the web members comprise first and second web members; all first web members corresponding to the same chord member are arranged in parallel, and a second web member is connected between the adjacent first web members.

6. The composite arch segment construction of claim 5 wherein the second web member ends butt against the first web member ends and the chords are connected at opposite ends to different chords, the second web members being angled with respect to the first web members.

7. The composite arch segment configuration of claim 1 wherein the center box includes a plurality of intermediate plates, and wherein the arch plates of one side box correspond one-to-one with the arch plates of another side box and are connected by the intermediate plates.

8. A composite arch segment construction according to claim 1 wherein a plurality of first cross braces between the side boxes are spaced apart and arranged with their axes parallel, and a second diagonal brace is connected between adjacent cross braces.

9. A bridge comprising a composite arch segment construction according to any one of claims 1 to 8.

10. A construction method of a combined arch segment is characterized by comprising the following steps:

the method comprises the following steps that arch plates, chord members and web members are prefabricated in a factory, the chord members are embedded into the arch plates, the web members are connected between two arch plates which are arranged in parallel at intervals, the end parts of the web members are connected with the chord members, and a side box with a truss as a web plate and concrete as a top plate is formed;

the arch plates of the two side boxes are connected through the middle plate, the web members are connected through the first cross brace, and a middle box with a web as a truss and a top plate as concrete is formed between the two side boxes;

the side box and the middle box are integrally used as combined arch sections, arch rings are formed after the closure is sequentially butted from bottom to top, and other structures are built to form a bridge.

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