CN113235388B - Flexible tied arch bridge structure with adjustable arch seat rigidity - Google Patents
Flexible tied arch bridge structure with adjustable arch seat rigidity Download PDFInfo
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- CN113235388B CN113235388B CN202110552776.4A CN202110552776A CN113235388B CN 113235388 B CN113235388 B CN 113235388B CN 202110552776 A CN202110552776 A CN 202110552776A CN 113235388 B CN113235388 B CN 113235388B
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- 239000000463 material Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a flexible tied arch bridge structure with adjustable arch abutment rigidity, which comprises bridge pier column limbs arranged on a bearing platform and a portal frame beam connected between the tops of two column limbs of the pier column limbs; an arch abutment is fixedly connected to the portal frame beam, and is fixedly connected with the arch rib, and the flexible tie rod penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a lower-bearing flexible tie-bar arch bridge system; the flexible tie bars are used for balancing horizontal thrust generated by the arch springing; an X-shaped supporting frame is arranged between two column limbs of the pier column limb and used for adjusting the integral anti-pushing rigidity of the pier. The flexible tied arch bridge structure with adjustable arch abutment rigidity has the advantages of higher stress mechanism and bearing efficiency, larger spanning capacity, excellent economic performance, smaller site operation amount and construction difficulty, and good connection with the traditional construction method, is convenient to implement, and has great practical value.
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 abutment rigidity.
Background
Bridges are structures used in road, railway, urban road and rural road and water construction to span various obstacles such as rivers, or other structures. The bridge is divided into a beam, an arch, a rigid frame, a crane and other combined systems according to the structural stress characteristics. The arch bridge is a classical bridge structure 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 middle and lower bearing type tied arch bridge is widely applied to areas with limited bridge deck elevation and under bridge clearance and poor geological conditions due to the characteristics of low building height, strong spanning capability, good economy, low foundation bearing capacity requirement and the like.
When the maximum span of the existing underlaid flexible tied arch bridge is not more than 300m and the span is further increased, the arch abutment and the foundation scale are required to be obviously increased to resist the horizontal thrust of the arch springing, the effective tension of the tie bar is obviously reduced, so that the economical efficiency is deteriorated, meanwhile, the horizontal deflection of the arch abutment is increased under the action of live load in the operation stage, the bridge deck system generates larger amplitude in the running process of the automobile, the running comfort is greatly reduced, and the safety and the durability of the bridge structure are influenced.
In general, the main factors affecting the increase in span of a flexible tied-arch bridge are:
(1) The bearing efficiency of the structure is low, 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 rigidity of the arch support results in significant reduction of structural driving comfort.
Disclosure of Invention
Based on the defects existing in the prior art, the technical problem to be solved by the invention is to provide the flexible tied arch bridge structure with adjustable arch abutment rigidity, which has higher structure stress mechanism and bearing efficiency, larger spanning capacity, superior economic performance, smaller field operation amount and construction difficulty and great practical value.
In order to achieve the above object, the present invention adopts the following technical measures:
the flexible tied arch bridge structure comprises a foundation arranged in a foundation layer and a bearing platform which is arranged on the foundation and is connected with the top of the foundation into a whole, wherein a bridge pier column and a portal frame beam connected between the tops of two column limbs of a pier column are arranged on the bearing platform; an arch abutment is fixedly connected to the portal frame beam, and is fixedly connected with the arch rib, and the flexible tie rod penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a lower-bearing flexible tie-bar arch bridge system; the flexible tie bars are used for balancing horizontal thrust generated by the arch springing; an X-shaped supporting frame is arranged between two column limbs of the pier column limb and used for adjusting the integral anti-pushing rigidity of the pier.
Preferably, the bridge pier column limbs and the gate frame cross beams form gate frame piers, a bridge deck system is connected between the tops of the two gate frame piers positioned at two ends of the arch rib, and a suspender is vertically connected between the bridge deck system and the arch rib; the flexible tie rod passes through the deck system and is anchored to the pier tops of the two gate frame piers.
The upper door-shaped frame pier is just connected with the arch leg at the pier top, the flexible tie rod passes through the door-shaped frame cross beam and is anchored at the pier top, a lower-bearing flexible tie rod arch bridge system is formed, and the tie rod balances the horizontal thrust generated by the arch leg.
Furthermore, the X-shaped supporting frames are multiple and are 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 limbs are combined to form a truss.
Further, the tops of two adjacent bearing platforms are connected through bearing platform tie beams; the tops of two adjacent gate-type frame piers are connected through a transverse tie beam.
By the method, the flexible tied arch bridge structure with adjustable arch abutment rigidity has the advantages of higher stress mechanism and bearing efficiency, larger spanning capacity, excellent economic performance, smaller site work load and construction difficulty, and good connection with the traditional construction method, is convenient to implement, and has at least the following beneficial effects:
(1) The rectangular frame is formed by the door-type frame bridge pier and the bearing platform during construction, at the moment, the thrust rigidity is small, the tension capability of the tie bars is effectively used for resisting horizontal thrust of arch feet, a frame arch structure with pier posts mainly pressed and tie bars balancing horizontal force is formed, and the performances of pier post concrete materials and tie bar steel bundles can be fully exerted;
(2) The gate-shaped frame structure forms an integral truss structure by arranging the X-shaped support frame, and the pier obtains larger thrust stiffness under the condition of smaller material consumption, so that the integral stress performance and the horizontal deflection resistance of the arch springing of the flexible tied arch bridge after the bridge is formed are effectively improved;
(3) The rigidity of the bridge pier in the construction and bridging state is designed to be adjusted by the X-shaped supporting frame, and the structural bearing efficiency is improved.
(4) Compared with the traditional constant-rigidity bridge pier, the rigidity-adjustable bridge pier can accurately adjust rigidity according to stress characteristics of different stages of the structure, improves material utilization efficiency, and is beneficial to increasing bridge crossing capacity;
(5) The mechanical characteristic advantage of the truss type structure of the door-type frame is fully utilized, the bearing efficiency of the lower-bearing type tied-arch bridge is improved, and when the span exceeds 200m, compared with the traditional structure, the truss type structure of the frame saves basic materials and has better engineering economy;
(6) The rigidity of the structural bridge stage is improved, the stress amplitude of the tie bar under live load is reduced, and the service life and fatigue resistance of the tie bar are improved; meanwhile, the displacement and 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 driving 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 that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are 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 illustration of a flexible tied arch bridge structure of the present invention with adjustable abutment rigidity.
FIG. 2 is an elevation view of an abutment pier at the construction stage;
FIG. 3 is an elevation view of an abutment pier with an X-shaped support bracket with adjustable stiffness;
fig. 4 is a cross-sectional view of an abutment pier.
Wherein: 1-arch rib, 2-arch seat, 3-pier column, 4-portal frame beam, 5-X-shaped support frame, 6-flexible tie bar, 7-bridge deck system, 8-suspender, 9-bearing platform, 10-foundation, 11-transverse tie beam and 12-bearing platform tie beam.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. 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 tie bar arch bridge structure with adjustable arch abutment rigidity, which aims to solve the problems of large engineering scale and the like of structural members such as bridge piers, foundations, tie bars and the like caused by the self weight of arch ribs and bridge deck systems.
The invention relates to a flexible tie bar arch bridge structure with adjustable arch abutment rigidity, which mainly comprises arch ribs 1, arch abutments 2, a gate-shaped pier column, an X-shaped support frame 5 of a pier body and tie bars 6, wherein the arch ribs 1 are just connected with the gate-shaped pier column through the arch abutments 2, the X-shaped support frame 5 can strengthen the connection between two column limbs, and the two-limb gate-shaped frame structure is converted into a truss structure, so that the pier column rigidity is greatly improved, and the X-shaped support frame 5 can finely adjust the integral rigidity of the pier column by changing the rigidity of a rod piece, thereby meeting different requirements of construction stages and bridge formation states on the pier rigidity.
The rectangular frame is formed by the door-type frame pier and the bearing platform during construction, at the moment, the thrust rigidity is small, the tension capability of the tie bars is effectively used for resisting horizontal thrust of arch feet, the frame arch structure with pier posts mainly pressed and tie bars balancing horizontal force is formed, and the performances of pier post concrete materials and tie bar steel bundles can be fully exerted.
The gate-shaped frame structure forms an integral truss structure by arranging the X-shaped support frame, and the pier obtains larger thrust stiffness under the condition of smaller material consumption, so that the integral stress performance and the horizontal deflection resistance of the arch springing of the flexible tied arch bridge after the bridge is formed are effectively improved. The rigidity of the bridge pier in the construction and bridging state is designed to be adjusted by the X-shaped supporting frame, and the structural bearing efficiency is improved.
The pier under the arch seat adopts the bearing platform 9 to pile the foundation 10, and as the tie bars balance most of the horizontal thrust of the arch feet, the pier bottom bending moment and the horizontal force are smaller, the pile foundation basically only bears the action of vertical shaft pressure, and the requirements on engineering geological conditions at the position of the arch seat are low.
Specifically, as shown in fig. 1 to 4, the flexible tied arch bridge structure with adjustable arch abutment rigidity of the invention is composed of an arch rib 1, an arch abutment 2, bridge pier limbs 3, a portal frame beam 4, an X-shaped supporting frame 5, a flexible tie bar 6, a bridge deck system 7, a suspender 8, a bearing platform 9, a foundation 10, a transverse tie beam 11 and a bearing platform tie beam 12.
As shown in fig. 1 and 2, the foundation 10 is arranged in a subsurface engineering geology suitable foundation layer, and the bearing platform 9 is positioned above the foundation 10 and is connected with the top of the foundation 10 into a whole.
As shown in fig. 3, the bridge pier column 3 is disposed above the bearing platform 9, and is rigidly connected to the bearing platform 9, and adopts a double-limb structure. The portal frame beam 4 rigidly connects the two legs of the bridge pier 3 at the pier top into a whole. The double-limb structure can convert pier bottom bending moment into axial force, effectively reduces pier and pile foundation bending moment, and the pier and pile foundation basically only bear the action of vertical axial pressure, so that the geological condition requirement of foundation engineering is reduced, and the economical efficiency of the structure is improved.
The arch base 2 is fixedly arranged on the portal frame beam 4, the arch rib 1 is fixedly arranged at the arch foot position, the flexible tie bars 6 penetrate through the portal frame beam 4 and are anchored at the end parts of the portal frame beam 4 to form a downward-supporting flexible tie bar arch bridge system, the flexible tie bars 6 balance horizontal thrust generated by the arch foot, and the bridge pier column 3 and the portal frame beam 4 form a portal frame pier with larger rigidity, so that the integral rigidity of the structure is increased, and the horizontal displacement of the arch foot is further reduced. Bridge deck system 7 is connected between the tops of two gate frame piers at two ends of arch rib 1, and suspender 8 is vertically connected between bridge deck system 7 and arch rib 1.
As shown in fig. 4, the tops of two adjacent bearing platforms 9 positioned on the same side of the arch rib 1 are connected through bearing platform tie beams 12; the tops of two adjacent gate frame piers on the same side of the arch rib 1 are connected by a transverse tie beam 11.
In addition, the X-shaped support frame 5 arranged between two column limbs of the door-shaped frame pier can adjust the integral anti-pushing rigidity of the pier, when the flexible tie bars 6 are tensioned during construction to balance the horizontal thrust of the arch ring, the rigidity of the door-shaped frame pier without the X-shaped support frame 5 is smaller, the utilization efficiency of the tie bars can be improved, the thrust of the arch ring is accurately balanced, after a bridge is formed, the whole bridge tie bars are tensioned, the rigidity of the door-shaped frame pier with the X-shaped support frame 5 is larger, and the deformation resistance of the bridge under the action of live load can be improved.
As shown in fig. 1 and 2, the X-shaped support frame 5 is formed by intersecting and combining the rod pieces, the anti-pushing rigidity of the portal frame pier can be adjusted through the position, the number and the change of the section of the rod pieces of the X-shaped support frame 5, the purpose of finely adjusting the anti-pushing rigidity is achieved, and the X-shaped support frame 5 can be arranged according to arch foot deformation limiting conditions. The X-shaped support frame 5 is designed by adopting 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 supporting frame 5 combines the bridge pier limbs 3 of the gate-shaped frame to form a truss, so that the pushing rigidity of the bridge pier is improved, the consumption of materials of the section of the pier is reduced, and the manufacturing cost is reduced.
In the invention, the rigidity of the portal frame pier with the X-shaped supporting frame 5 is adjustable, the X-shaped supporting frame 5 is not arranged during construction, the anti-pushing rigidity is small, when the flexible tie rod 6 is tensioned to balance the horizontal pushing force of the arch foot, the effective tensile force of the tie rod is large, the utilization rate is high, the tensile force is not more transferred to the pier body, the utilization rate of the tie rod is improved, the consumption of the flexible tie rod 6 is saved, the X-shaped supporting frame 5 added after the bridge increases the rigidity of the pier column but does not influence the tensioned flexible tie rod 6, the stress amplitude of the flexible tie rod 6 under live load can be effectively reduced, and the service life and fatigue resistance of the flexible tie rod 6 are improved.
Furthermore, the door-shaped frame pier with the X-shaped supporting frame 5 has high rigidity, and enough safety reserve for resisting horizontal thrust is reserved, so that the cable replacement of the flexible tie rod 6 at the later stage is facilitated.
The invention determines the proper size of the portal frame pier column, the cross section size of the tie bar, the number and arrangement of the X-shaped supporting frames and the cross section of the rod piece according to the stress of the structure and the current effective structural design specification.
As can be seen from the description, compared with the traditional constant-rigidity bridge pier, the rigidity of the bridge pier with adjustable rigidity can be accurately adjusted according to the stress characteristics of different stages of the structure, the material utilization efficiency is improved, and the bridge pier with adjustable rigidity is beneficial to the increase of spans of bridges of the same type; the mechanical characteristic advantages of the tie bar and the bridge pier structure are fully utilized, the bearing efficiency of the beam structure is improved, and better engineering economy is achieved; the rigidity of the structural bridge stage is improved, the stress amplitude of the tie bar under live load can be effectively reduced, and the service life and fatigue resistance of the tie bar are improved.
While the invention has been described with respect to specific embodiments thereof, it will be appreciated that the invention is not limited thereto, but is intended to cover modifications and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The flexible tied arch bridge structure with the rigidity of the arch base adjustable comprises a foundation arranged in a foundation layer and a bearing platform which is arranged on the foundation and is connected with the top of the foundation into a whole, and is characterized in that a bridge pier column and a portal frame cross beam which is connected between the tops of two column limbs of a pier column are arranged on the bearing platform;
an arch abutment is fixedly connected to the portal frame beam, and is fixedly connected with the arch rib, and the flexible tie rod penetrates through the portal frame beam and is then anchored at the end part of the portal frame beam to form a lower-bearing flexible tie-bar arch bridge system; the flexible tie bars are used for balancing horizontal thrust generated by the arch springing;
an X-shaped supporting frame is arranged between two column limbs of the pier column limb and is used for adjusting the integral anti-pushing rigidity of the pier; the X-shaped supporting frames are formed by intersecting and combining rod pieces, and the push-resistant rigidity of the door-shaped frame pier is adjusted through the change of the positions, the number and the section of the rod pieces of the X-shaped supporting frames; and arranging the X-shaped supporting frame according to the arch springing deformation limiting condition.
2. A flexible tied arch bridge structure with adjustable arch base rigidity according to claim 1, wherein the bridge pier limbs and the portal frame beams form a portal frame pier, a bridge deck system is connected between the tops of 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 rod passes through the deck system and is anchored to the pier tops of the two gate frame piers.
3. A flexible tied arch bridge structure with adjustable arch abutment rigidity according to claim 1, wherein the X-shaped support frames are plural and are distributed up and down in the space between two limbs of the pier limb.
4. A flexible tied-arch bridge structure of adjustable arch abutment rigidity according to claim 1 or 3, wherein the X-shaped support frame is installed after construction of the full-bridge main body structure is completed; the X-shaped support frame and the pier limbs are combined to form a truss.
5. A flexible tied arch bridge structure with adjustable arch abutment rigidity according to claim 2, wherein the tops of two adjacent bearing platforms are connected by 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN113235388B true CN113235388B (en) | 2024-02-09 |
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