CN113235388A - Flexible tied arch bridge structure with adjustable arch support rigidity - Google Patents
Flexible tied arch bridge structure with adjustable arch support rigidity Download PDFInfo
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- CN113235388A CN113235388A CN202110552776.4A CN202110552776A CN113235388A CN 113235388 A CN113235388 A CN 113235388A CN 202110552776 A CN202110552776 A CN 202110552776A CN 113235388 A CN113235388 A CN 113235388A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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Abstract
The invention discloses a flexible tied arch bridge structure with adjustable arch support rigidity, which comprises pier column limbs arranged on a cushion cap and a portal frame beam connected between the tops of the two column limbs of the pier column limbs; an arch support is fixedly connected to the portal frame beam, the arch support is fixedly connected with an arch rib, and a flexible tie bar penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a through type flexible tie bar arch bridge system; the flexible tie bar is used for balancing the horizontal thrust generated by the arch springing; an X-shaped support frame is arranged between two pier limbs of the pier column limb and used for adjusting the integral thrust rigidity of the pier. The flexible tied arch bridge structure with adjustable arch support rigidity has the advantages of higher stress mechanism and bearing efficiency, higher crossing capability, superior economic performance, smaller field operation amount and construction difficulty, good connection with the traditional construction method, convenient implementation and great practical value, and improves the bearing efficiency of the bridge structure from the aspects of a structure system and the internal stress mechanism.
Description
Technical Field
The invention relates to the technical field of bridges in civil engineering, in particular to a flexible tied arch bridge structure with adjustable arch support rigidity.
Background
The bridge is a structure for crossing various barriers (such as rivers or other structures) in highway, railway, urban road, rural road and water conservancy construction. The bridge is divided according to the stress characteristics of the structure, and can be divided into a beam, an arch, a rigid frame, a crane and other combined systems. The arch bridge is a classic bridge structure form and is divided into an upper bearing type, a middle bearing type and a lower bearing type according to the position of a bridge deck system. The through tied arch bridge has the characteristics of low building height, strong spanning capability, good economy, low requirement on foundation bearing capacity and the like, and is widely applied to areas with limited bridge deck elevation and bridge clearance and poor geological conditions.
At present, the maximum span of the through type flexible tied arch bridge is not more than 300m, when the span is further increased, the arch support and the foundation scale need to be obviously increased to resist the horizontal thrust of an arch foot, the effective tension of a tie rod is obviously reduced, the economic performance is deteriorated, meanwhile, the horizontal deflection of the arch support is increased under the action of live load in the operation stage, a bridge deck system generates larger amplitude in the automobile running process, the running comfort is greatly reduced, and the safety and the durability of a bridge structure are influenced.
In general, the main factors influencing the increase of the span of the flexible tied arch bridge are:
(1) the structure has low bearing efficiency, when the span exceeds 300m, the horizontal thrust of the arch springing is large, the technical risk is increased, the safety of the structure is deteriorated, and the engineering economy is deteriorated;
(2) insufficient arch rigidity results in a significant reduction in structural ride comfort.
Disclosure of Invention
Based on the defects of the prior art, the technical problem to be solved by the invention is to provide the flexible tied arch bridge structure with adjustable arch support rigidity, which has the advantages of higher structural stress mechanism and bearing efficiency, larger spanning capability, superior economic performance, smaller field operation amount and construction difficulty and great practical value.
In order to achieve the purpose, the invention adopts the following technical measures:
a flexible tied arch bridge structure with adjustable arch support rigidity comprises a foundation arranged in a foundation layer and a bearing platform which is positioned on the foundation and is connected with the top of the foundation into a whole, wherein a bridge pier column limb and a portal frame beam connected between the tops of two column limbs of the bridge pier column limb are arranged on the bearing platform; an arch support is fixedly connected to the portal frame beam, the arch support is fixedly connected with an arch rib, and a flexible tie bar penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a through type flexible tie bar arch bridge system; the flexible tie bar is used for balancing the horizontal thrust generated by the arch springing; an X-shaped support frame is arranged between two pier limbs of the pier column limb and used for adjusting the integral thrust rigidity of the pier.
Preferably, the pier column limbs and the portal frame cross beams form portal frame piers, a bridge deck system is connected between pier tops of the two portal frame piers positioned at two ends of the arch rib, and a hanging rod is vertically connected between the bridge deck system and the arch rib; the flexible tie bar passes through the deck system and is anchored with the pier tops of the two gate-type frame piers.
The gate-type frame pier is rigidly connected with the arch springing at the pier top, the flexible tie bar penetrates through the beam of the gate-type frame and is anchored at the pier top to form a through type flexible tie bar arch bridge system, and the tie bar balances the horizontal thrust generated by the arch springing.
Furthermore, the X-shaped support frames are multiple and distributed up and down in the space between two column limbs of the pier column limb.
Optionally, the X-shaped support frame is installed after the construction of the full-bridge main body structure is completed; the X-shaped support frame and the pier column are combined to form a truss.
Furthermore, the tops of two adjacent bearing platforms are connected through a bearing platform tie beam; the tops of two adjacent gate-type frame piers are connected through a transverse tie beam.
Therefore, the flexible tied arch bridge structure with adjustable arch support rigidity has the advantages of higher stress mechanism and bearing efficiency, higher spanning capability, superior economic performance, smaller field operation amount and construction difficulty, good connection with the traditional construction method and convenient implementation, and at least has the following beneficial effects:
(1) the portal frame pier and a bearing platform form a rectangular frame during construction, the push-resisting rigidity is low, the tension force capability of the tie bars is effectively used for resisting the horizontal pushing force of arch springing, a frame arch structure with the pier stud mainly stressed and the tie bars balancing the horizontal force is formed, and the performances of a pier stud concrete material and tie bar steel bundles can be fully exerted;
(2) the portal frame structure forms an integral truss structure by arranging the X-shaped support frame, the pier obtains larger anti-pushing rigidity under the condition of smaller material consumption, and the integral stress performance and the horizontal deflection resistance of arch springing of the flexible tied arch bridge after the bridge is formed are effectively improved;
(3) the construction and bridge-forming pier rigidity is designed to be adjusted by the X-shaped support frame, and the structural bearing efficiency is improved.
(4) Compared with the traditional pier with the unchanged rigidity, the pier with the adjustable rigidity can adjust the rigidity more accurately according to the stress characteristics of different stages of the structure, improve the utilization efficiency of materials and is beneficial to increasing the spanning capacity of a bridge;
(5) the mechanical characteristic advantages of the portal frame truss type structure are fully utilized, the bearing efficiency of the through tied arch bridge is improved, when the span exceeds 200m, compared with the traditional structure, the frame truss type structure saves base materials, and has better engineering economy;
(6) the rigidity of the bridge forming stage is improved, the stress amplitude of the tie bar under live load is reduced, and the service life and the fatigue resistance of the tie bar are improved; meanwhile, the displacement and the stress of the arch rib and the bridge deck structure under live load are reduced, the stress performance of the arch rib and the bridge deck structure is improved, and the driving comfort and the safety are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flexible tied arch bridge structure with adjustable arch support rigidity according to the invention.
FIG. 2 is an elevation view of an abutment pier at the construction stage;
FIG. 3 is an elevation view of an arch abutment pier with an X-shaped support frame and adjustable rigidity;
fig. 4 is a cross-sectional view of an abutment pier.
Wherein: the method comprises the following steps of 1-arch rib, 2-arch base, 3-pier column limb, 4-portal frame beam, 5-X-shaped support frame, 6-flexible tie bar, 7-bridge deck system, 8-suspender, 9-cushion cap, 10-foundation, 11-transverse tie beam and 12-cushion cap tie beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
The invention provides a flexible tied arch bridge structure capable of adjusting the rigidity of an arch abutment, which aims to solve the problems that the engineering scale of structural components such as piers, foundations, tied bars and the like is large due to the fact that an arch rib and a bridge deck are heavy in self weight, the flexible tied arch bridge structure comprises a main arch ring, tied bars, arch abutments and pier columns, the arch abutment of each arch rib is fixedly connected with the arch rib, the piers are of a forward bridge direction double-limb portal frame structure, two column limbs of the piers are combined with cross beams at the top of the piers to form a portal frame structure, and X-shaped support frames are arranged at different height positions of the column limbs in the portal frame to adjust the integral thrust rigidity of the portal frame pier columns so as to form an arch abutment system with adjustable rigidity.
The flexible tied arch bridge structure with the adjustable arch abutment rigidity mainly comprises an arch rib 1, an arch abutment 2, a door-shaped pier stud, an X-shaped support frame 5 of a pier body and a tied bar 6, wherein the arch rib 1 is rigidly connected with the door-shaped pier stud through the arch abutment 2, the X-shaped support frame 5 can enhance the connection between two column limbs, so that the double-limb door-shaped frame structure is converted into a truss structure, the rigidity of the pier stud is greatly improved, the rigidity of the whole pier stud can be finely adjusted through changing the rigidity of a rod piece by the X-shaped support frame 5, and different requirements of a construction stage and a bridge forming state on the rigidity of the pier are met.
The door type frame pier and a bearing platform form a rectangular frame during construction, the push-resisting rigidity is small, the tension force capability of the tie bars is effectively used for resisting the horizontal pushing force of arch springing, a frame arch structure with the pier stud mainly stressed and the tie bars balancing the horizontal force is formed, and the performance of a pier stud concrete material and tie bar steel bundles can be fully exerted.
The portal frame structure forms an integral truss structure by arranging the X-shaped support frame, the pier obtains larger anti-pushing rigidity under the condition of smaller material consumption, and the integral stress performance and the horizontal deflection resistance of arch springing of the flexible tied arch bridge after the bridge is formed are effectively improved. The construction and bridge-forming pier rigidity is designed to be adjusted by the X-shaped support frame, and the structural bearing efficiency is improved.
The pier under the arch abutment adopts a pile foundation 10 connected with a bearing platform 9, as the tie bars balance most of horizontal thrust of arch springing, the bending moment and the horizontal force of the pier bottom are smaller, and the pile foundation basically only bears the action of vertical axial pressure, the requirement on engineering geological conditions at the position of the arch abutment is low.
Specifically, as shown in fig. 1 to 4, the flexible tied arch bridge structure with adjustable arch support rigidity of the invention is composed of an arch rib 1, an arch support 2, pier stud limbs 3, portal frame cross beams 4, an X-shaped support frame 5, a flexible tied bar 6, a bridge deck system 7, a hanger rod 8, a cushion cap 9, a foundation 10, a cross tie beam 11 and a cushion cap tie beam 12.
As shown in fig. 1 and 2, the foundation 10 is disposed in a foundation layer suitable for engineering geology below the ground surface, and the bearing platform 9 is positioned above the foundation 10 and integrally connected with the top of the foundation 10.
As shown in fig. 3, the abutment limbs 3 are arranged on the platform 9, rigidly connected with the platform 9, and adopt a double-limb structure. The portal frame beam 4 rigidly connects the two pier limbs of the pier stud 3 into a whole at the pier top. The double-limb structure can convert the bending moment of the pier bottom into the axial force, effectively reduce the bending moment of the pier and the pile foundation, and basically only bear the action of vertical axial pressure, thereby reducing the requirement of the geological condition of foundation engineering and improving the economical efficiency of the structure.
The arch support 2 is fixedly connected to the portal frame beam 4, the arch rib 1 is fixedly connected to the arch foot position, the flexible tie bar 6 penetrates through the portal frame beam 4 and then is anchored to the end portion of the portal frame beam to form a lower-support type flexible tie bar arch bridge system, the flexible tie bar 6 balances the horizontal thrust generated by the arch foot, and the portal frame pier with large rigidity and composed of the pier column limbs 3 and the portal frame beam 4 increases the overall rigidity of the structure and further reduces the horizontal displacement of the arch foot. And a bridge deck system 7 is connected between the pier tops of the two door-shaped frame piers positioned at the two ends of the arch rib 1, and a suspender 8 is vertically connected between the bridge deck system 7 and the arch rib 1.
As shown in fig. 4, the tops of two adjacent bearing platforms 9 on the same side of the arch rib 1 are connected through a bearing platform tie beam 12; the tops of two adjacent gate-type frame piers on the same side of the arch rib 1 are connected by a cross tie 11.
In addition, the X-shaped support frame 5 arranged between the two column limbs of the gate-shaped frame pier can adjust the integral anti-thrust rigidity of the pier, when the flexible tie bar 6 is tensioned to balance the horizontal thrust of the arch ring during construction, the gate-shaped frame pier without the X-shaped support frame 5 is low in rigidity, the utilization efficiency of the tie bar can be improved, the thrust of the arch ring can be accurately balanced, after a bridge is formed, the tensioning of the full-bridge tie bar is completed, the gate-shaped frame pier with the X-shaped support frame 5 is high in rigidity, and the anti-deformation capacity of the bridge under the live load effect can be improved.
As shown in fig. 1 and 2, the X-shaped support frame 5 of the present invention is formed by cross-combining rod members, and the thrust stiffness of the gate-type frame pier can be adjusted by changing the position and number of the X-shaped support frame 5 and the cross-section of the rod members, so as to achieve the purpose of finely adjusting the thrust stiffness, and the X-shaped support frame 5 can be arranged according to the limitation condition of arch springing deformation. The X-shaped support frame 5 adopts a rear mounting design, and the X-shaped support frame 5 is mounted after the construction of the full-bridge main body structure is completed. The X-shaped support frame 5 combines the pier column limbs 3 of the portal frame to form a truss, so that the thrust resistance of the pier is improved, the material consumption of the section of the pier column is reduced, and the manufacturing cost is reduced.
In the invention, the rigidity of the door-shaped frame pier with the X-shaped support frame 5 is adjustable, the X-shaped support frame 5 is not used during construction, the anti-push rigidity is small, when the horizontal pushing force of the arch springing is balanced by stretching the flexible tie bar 6, the effective tension of the tie bar is large, the utilization rate is high, the tension force can not be transmitted to the pier body much, the utilization rate of the tie bar is improved, the using amount of the flexible tie bar 6 is saved, the X-shaped support frame 5 added after the bridge is formed increases the rigidity of the pier column without influencing the stretched flexible tie bar 6, the stress amplitude of the flexible tie bar 6 under live load can be effectively reduced, and the service life and the anti-fatigue performance of the flexible tie bar 6 are improved.
Furthermore, the gate-type frame pier with the X-shaped support frame 5 has high rigidity, and enough safe reserve for resisting horizontal thrust is reserved, so that cable replacement of the flexible tie bar 6 in the later period is facilitated.
The invention determines the proper size of the door-shaped frame pier stud, the size of the cross section of the tie bar, the number and arrangement of the X-shaped support frames and the cross section of the rod piece according to the structural stress and the current effective structural design standard.
Compared with the traditional pier with the unchanged rigidity, the adjustable-rigidity pier can adjust the rigidity more accurately according to the stress characteristics of different stages of the structure, improve the utilization efficiency of materials and is beneficial to increasing the span of bridges of the same type; the mechanical characteristic advantages of the tie bar and pier structures are fully utilized, the bearing efficiency of the beam type structure is improved, and the engineering economy is better; the rigidity of the bridge forming stage is improved, the stress amplitude of the tie bar under live load can be effectively reduced, and the service life and the fatigue resistance of the tie bar are improved.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention should be included in the scope of the present invention.
Claims (5)
1. A flexible tied arch bridge structure with adjustable arch support rigidity comprises a foundation arranged in a foundation layer and a bearing platform which is positioned on the foundation and is connected with the top of the foundation into a whole, and is characterized in that pier column limbs and a portal frame beam connected between the tops of the two column limbs of the pier column limbs are arranged on the bearing platform;
an arch support is fixedly connected to the portal frame beam, the arch support is fixedly connected with an arch rib, and a flexible tie bar penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a through type flexible tie bar arch bridge system; the flexible tie bar is used for balancing the horizontal thrust generated by the arch springing;
an X-shaped support frame is arranged between two pier limbs of the pier column limb and used for adjusting the integral thrust rigidity of the pier.
2. The flexible tied arch bridge structure with adjustable arch support rigidity according to claim 1, wherein the pier stud limb and the portal frame beam constitute portal frame piers, a bridge deck is connected between the pier tops of two portal frame piers at both ends of an arch rib, and a suspender is vertically connected between the bridge deck and the arch rib;
the flexible tie bar passes through the deck system and is anchored with the pier tops of the two gate-type frame piers.
3. An adjustable abutment stiffness flexible bowstring arch bridge structure according to claim 1, wherein the X-shaped support frames are plural and distributed up and down in a space between two of the pier columns.
4. The flexible tied arch bridge structure with adjustable arch center rigidity according to claim 1 or 3, wherein the X-shaped supporting frame is installed after the construction of the full-bridge main body structure is completed; the X-shaped support frame and the pier column are combined to form a truss.
5. The flexible tied arch bridge structure with adjustable arch support rigidity according to claim 2, wherein the tops of two adjacent bearing platforms are connected through a bearing platform tie beam; the tops of two adjacent gate-type frame piers are connected through a transverse tie beam.
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| CN202110552776.4A CN113235388B (en) | 2021-05-20 | 2021-05-20 | Flexible tied arch bridge structure with adjustable arch seat rigidity |
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| CN202110552776.4A CN113235388B (en) | 2021-05-20 | 2021-05-20 | Flexible tied arch bridge structure with adjustable arch seat rigidity |
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