CN115652768A - Arch rib support system and installation method of a continuous asymmetric non-thrust arch bridge - Google Patents

Abstract

The invention discloses an arch rib support system of a continuous asymmetric non-thrust arch bridge and an installation method thereof. The arch rib support system includes an arch rib foundation at a fixed end and a support structure at a sliding end. The fixed end of the arch rib is fixed on the main bridge deck. On the beam, the top of the arch rib foundation at the fixed end is fixedly connected with the main beam of the bridge deck and is located directly below the fixed end of the arch rib. The pre-buried foundation is fixed on the top of the foundation cap, the sliding end of the arch rib is pre-embedded in the foundation cap, the bottom of the brace is fixed on the pre-embedded foundation of the brace, and the top of the brace is fixed on the main beam of the bridge deck system. The tie rods are arranged vertically, the top and bottom ends of the tie rods are respectively hinged on the main girder of the bridge deck system and the foundation cap, and the tie rods are located outside the top of the diagonal brace. The invention can reduce the internal stress of the support system and eliminate the horizontal thrust of the arch rib.

Description

Arch rib support system and installation method of a continuous asymmetric non-thrust arch bridge

technical field

The invention relates to the construction field of a non-thrust arch bridge, in particular to an arch rib support system of a continuous asymmetric non-thrust arch bridge and an installation method thereof.

Background technique

At present, the support systems at both ends of the arch ribs of continuous asymmetric non-thrust arch bridges are fixed systems, which require higher foundations at the arch feet at both ends of the arch ribs, higher soil penetration depth for pile foundations, and more concrete consumption for pier bodies To ensure the stability of the structure, the construction process is generally a synchronous and symmetrical installation of large and small mileage, and the timing of the structural system conversion is relatively obvious, and the axial force borne by the main girder of the bridge deck system is directly converted into the horizontal reaction force of the foundation. Taking the medium-supported steel structure arch bridge as an example, the horizontal reaction force under constant load is about 2000t; under the standard combination, because the bridge structure cannot be freely expanded and contracted, the horizontal reaction force is as high as 7000t, which seriously restricts the design of the lower foundation.

Contents of the invention

The technical problem to be solved by the present invention is to provide an arch rib support system of a continuous asymmetric non-thrust arch bridge and its installation method, which can reduce the internal stress of the support system and eliminate the horizontal thrust of the arch rib.

Technical scheme of the present invention is:

An arch rib support system of a continuous asymmetric thrustless arch bridge, including a fixed end support structure and a sliding end support structure respectively used to support the two ends of the arch rib, and the two ends of the arch rib are respectively the fixed end of the arch rib and the sliding end;

The fixed-end support structure is a fixed-end arch rib foundation, the fixed end of the arch rib is fixed on the main beam of the bridge deck system, and the top of the fixed-end arch rib foundation is fixedly connected with the main beam of the bridge deck system and is located at the front of the fixed end of the arch rib. below;

The sliding end support structure includes a foundation cap, a diagonal brace embedded foundation, diagonal braces and tie rods. The diagonal brace embedded foundation is fixed on the top of the foundation cap, and the sliding end of the arch rib is along the axis of the arch rib. The bottom end of the diagonal brace is fixed on the embedded foundation of the diagonal brace, the top of the diagonal brace is fixed on the main beam of the bridge deck system, and the diagonal brace is adjacent to the arch rib. The sliding end of the pull rod is vertically arranged, the top end of the pull rod is hinged on the main beam of the bridge deck and is located outside the top of the diagonal brace, and the bottom end of the pull rod is hinged on the foundation cap.

The main girder of the bridge deck system includes N longitudinal beams extending axially along the bridge deck and a plurality of cross beams perpendicular to the longitudinal beams, N is an integer not less than two, the fixed ends of the arch ribs, the fixed The top ends of the end arch rib foundations are all fixed on the corresponding longitudinal beams. The sliding end support structure includes N diagonal braces embedded foundations, N diagonal braces and 2N tie rods. The bottom end of each diagonal brace is fixed on the corresponding On the pre-embedded foundation of diagonal braces, the tops of N diagonal braces are respectively fixed on N longitudinal beams, and each longitudinal beam is hinged with two tie rods arranged in parallel.

There are M arch ribs, M is an integer not less than two, and there are M fixed-end arch rib foundations, and the fixed end of each arch rib is correspondingly connected directly above a fixed-end arch rib foundation.

The diagonal brace embedded foundation is a triangular support block, the bottom surface of the diagonal brace embedded foundation is fixed on the foundation cap, and the bottom end of the diagonal brace is fixed on the outer oblique side of the diagonal brace embedded foundation.

The anti-seismic spherical hinge support is fixedly connected to the pre-buried foundation of the diagonal brace, and the bottom end of the diagonal brace is fixed on the anti-seismic spherical hinge support.

The lower ear plate extending upward is pre-embedded on the foundation cap, the upper ear plate extending downward is welded on the main girder of the bridge deck, the top end of the tie rod is hinged with the upper ear plate through a pin shaft, and the bottom end of the tie rod passes through The pin shaft is hinged with the lower ear plate.

A method for installing the arch rib support system of a continuous asymmetric non-thrust arch bridge, specifically comprising the following steps:

(1) First, pour the embedded foundation of diagonal braces on the foundation cap, and pre-embed the anchorage section on the embedded foundation of diagonal braces, then install the temporary support of diagonal braces on the side of the embedded foundation of diagonal braces, and then install Install the anti-seismic spherical joint bearing on the outer slope of the pre-buried foundation, weld and fix the bottom plate of the anti-seismic spherical joint support and the pre-embedded anchorage section of the pre-embedded foundation of the diagonal brace, and then lift the diagonal brace so that the diagonal brace is supported on the temporary support of the diagonal brace and temporarily fixed with the temporary support of the diagonal brace, and at the same time, the bottom end of the diagonal brace is supported on the anti-seismic spherical joint support, and then the bridge deck system is assembled, and the top of the diagonal brace is docked with the longitudinal beam of the bridge deck system. After the butt joint adjustment of the top and bottom ends is completed, temporarily fix the top and longitudinal beams of the diagonal brace with a code plate, and finally weld the bottom of the diagonal brace to the top plate of the anti-seismic spherical joint support, and release the temporary restraint of the anti-seismic spherical joint support , and then weld the top of the brace and the longitudinal beam to complete the installation of the brace;

(2) Pre-buried multiple lower ear plates on the foundation cap, welded upper ear plates at the bottom of each longitudinal beam, and then hoisted the tie rods so that the tie rods were vertical and the ear holes at the upper end overlapped with the ear holes on the corresponding upper ear plates , after accurately aligning the holes, immediately penetrate the pin shaft on the upper ear plate, and then adjust the position of the bottom end of the tie rod so that the ear hole at the lower end overlaps with the corresponding ear hole on the lower ear plate. Finally, tighten the nuts on the pin shafts of the upper lug plate and the lower lug plate to complete the installation of the tie rod.

In the step (2), the top of the pull rod is tied and fixed with the steel wire rope, the bottom end of the bridge deck system is located on the side of the upper ear plate and a lifting lug is installed, the steel wire rope passes through the lifting lug, and the top of the pull rod is slowly lifted by pulling the wire rope , adjust the air posture of the pull rod so that the ear hole at the upper end of the pull rod overlaps with the ear hole on the corresponding upper ear plate. After the holes are accurately aligned, immediately penetrate the pin shaft on the upper ear plate, and then adjust the pull rod by pulling the bottom end of the pull rod through the chain hoist The air posture makes the lower ear hole overlap with the ear hole on the corresponding lower ear plate. After the holes are accurately aligned, immediately penetrate the pin shaft on the lower ear plate.

Advantages of the present invention:

The present invention is equipped with diagonal braces and tie rods, so that all the horizontal thrust of the arch ribs is borne by the main girder of the bridge deck system. Changes in internal forces caused by displacement. The invention can improve the tension cable force of the suspender between the arch rib and the bridge deck system, so that the success rate of the tension cable force of the suspender meets the requirements, and has great significance for the smooth development of subsequent construction procedures.

Description of drawings

Fig. 1 is a structural schematic diagram of the arch rib support system of the present invention.

Fig. 2 is an enlarged view of part A in Fig. 1 .

Fig. 3 is a top perspective view of the arch rib support system of the present invention installed on the longitudinal beam.

Reference signs: 1-longitudinal beam, 2-arch rib, 3-fixed end arch rib foundation, 41-foundation cap, 42-diagonal brace embedded foundation, 43-diagonal brace, 44-tie rod, 45-seismic spherical hinge Bearing, 46-upper ear plate, 47-lower ear plate.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

See Fig. 1-Fig. 3, the continuous asymmetric non-thrust arch bridge includes the deck system main girder and three arch ribs 2, the bridge deck system main girder includes four longitudinal girders 1 extending axially along the bridge deck and a plurality of Longitudinal girders 1 vertically intersecting beams, two of which are located in the middle of the bridge deck system, and the other two longitudinal girders 1 are respectively located on both sides of the bridge deck system, and among the three arch ribs 2, one of the arch ribs 2 is positioned In the middle of the deck system, the other two arch ribs 2 are positioned on both sides of the deck system.

An arch rib support system of a continuous asymmetric thrustless arch bridge, including a fixed end support structure and a sliding end support structure respectively used to support the two ends of the arch rib 2, and the two ends of the arch rib 2 are the fixed end and the arch rib respectively. the sliding end of the rib;

The fixed-end support structure is three fixed-end arch rib foundations 3, the fixed ends of the middle arch rib 2 are fixed on the two middle longitudinal beams 1 of the bridge deck system, and the fixed ends of the two side arch ribs 2 are respectively fixed on the bridge deck It is tied to the two side longitudinal beams 1, the top of one of the fixed end arch rib foundations 3 is fixed on the two middle longitudinal beams 1 and is located directly below the fixed end of the middle arch rib 2, and the other two fixed end arch ribs The top ends of the foundation 3 are respectively fixed on the longitudinal beams 1 at the two ends and located directly below the fixed ends of the arch ribs 2 at the two ends;

The sliding end support structure includes a foundation cap 41, four diagonal braces embedded foundation 42, four diagonal braces 43 and eight tie rods 44, and the sliding ends of the three arch ribs 2 extend along the axial direction of the arch rib 2 and pass through After crossing the bridge deck system, it is pre-embedded into the foundation cap 41. The four diagonal bracing pre-buried foundations 42 are all triangular support blocks. The outer slopes of the bracing embedded foundation 42 are fixedly connected with anti-seismic spherical hinge bearings 45, and the bottom end of each diagonal brace 43 is fixed on the anti-seismic spherical hinge bearing 45 of the corresponding diagonal brace embedded foundation 42. The four diagonal braces The tops of 43 are respectively fixed on the four longitudinal beams 1 of the bridge deck system, and the diagonal braces 43 are adjacent to the sliding ends of the arch ribs 2, and eight tie rods 44 are vertically arranged, and each longitudinal beam 1 is welded with two The upper lugs 46 extending downwards, the top ends of every two pull rods 44 are hinged to the two upper lugs 46 of a corresponding longitudinal beam 1 through pin shafts and are located on the outer side of the top of a corresponding diagonal brace 43 , the foundation platform 41 Eight lower lugs 47 extending upward are pre-embedded on the top, and the bottom ends of the eight pull rods 44 are correspondingly hinged with the eight lower lugs 47 through pin shafts.

Installation method of the present invention:

(1), first pouring the diagonal brace embedded foundation 42 on the foundation cap 41, and pre-embed the anchor section on the diagonal brace embedded foundation 42, then install the diagonal brace temporary support on the side of the diagonal brace embedded foundation, and then Install the anti-seismic spherical joint support 45 on the outer inclined surface of the inclined brace embedded foundation 42, the base plate of the anti-seismic spherical hinge support 45 is welded and fixed with the pre-embedded anchorage section of the inclined brace embedded foundation 42, and then the inclined brace 43 is hoisted, so that The diagonal brace 43 is supported on the temporary support of the diagonal brace and temporarily fixed with the temporary support of the diagonal brace. At the same time, the bottom end of the diagonal brace 43 is supported on the anti-seismic spherical joint support 45, and then the bridge deck system is assembled, and the top of the diagonal brace 43 Docking with the longitudinal beam 1 of the bridge deck system, after the butt joint adjustment of the top and bottom ends of the diagonal brace 43 is completed, immediately use the code plate to temporarily fix the top of the diagonal brace 43 and the longitudinal beam 1, and finally connect the bottom end of the diagonal brace 43 with the anti-seismic ball The top plate of the hinge support 45 is welded, and the temporary restraint of the anti-seismic spherical hinge support 45 is released, and then the top of the diagonal brace 43 and the longitudinal beam 1 are welded to complete the installation of the diagonal brace;

(2), eight lower lugs 47 are pre-embedded on the foundation cap 41, two upper lugs 46 are welded at the bottom of each longitudinal beam 1, and then the pull rod 44 is hoisted, and the top of the pull rod 44 is bound and fixed with a steel wire rope, The bottom end of the bridge deck system is located at the side of the upper ear plate 46 and a lifting lug is installed. The wire rope passes through the lifting lug, and the top of the pull rod 44 is slowly lifted by pulling the wire rope to adjust the attitude of the pull rod 44 in the air, so that the ear hole at the upper end of the pull rod 44 is aligned with the upper end of the pull rod 44. The ear holes on the corresponding upper lug plate 46 overlap. After the holes are accurately aligned, immediately penetrate the pin shaft on the upper lug plate 46, and then adjust the air posture of the pull bar by pulling the bottom end of the pull rod 44 through the hand chain hoist, so that the ear hole at the lower end is aligned with the corresponding lower end. The ear holes on the lug plate 47 overlap, and after the holes are accurately aligned, immediately penetrate the pin shaft on the lower lug plate 47, and finally tighten the nuts on the pin shafts of the upper lug plate 46 and the lower lug plate 47 to complete the installation of the pull rod 44 .

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (8)

1. The arch rib support system of a continuous asymmetrical arch bridge without thrust is characterized in that: it comprises a fixed end support structure and a sliding end support structure respectively used to support the two ends of the arch rib, and the two ends of the arch rib are respectively arch ribs the fixed end and the sliding end of the arch rib; The fixed-end support structure is a fixed-end arch rib foundation, the fixed end of the arch rib is fixed on the main beam of the bridge deck system, and the top of the fixed-end arch rib foundation is fixedly connected with the main beam of the bridge deck system and is located at the front of the fixed end of the arch rib. below; The sliding end support structure includes a foundation cap, a diagonal brace embedded foundation, diagonal braces and tie rods. The diagonal brace embedded foundation is fixed on the top of the foundation cap, and the sliding end of the arch rib is along the axis of the arch rib. The bottom end of the diagonal brace is fixed on the embedded foundation of the diagonal brace, the top of the diagonal brace is fixed on the main beam of the bridge deck system, and the diagonal brace is adjacent to the arch rib. The sliding end of the pull rod is vertically arranged, the top end of the pull rod is hinged on the main beam of the bridge deck and is located outside the top of the diagonal brace, and the bottom end of the pull rod is hinged on the foundation cap. 2. The arch rib support system of a continuous asymmetric thrustless arch bridge according to claim 1, characterized in that: the main girder of the bridge deck system includes N longitudinal beams extending axially along the bridge deck and multiple A crossbeam perpendicular to the longitudinal beam, N is an integer not less than two, the fixed end of the arch rib and the top of the arch rib foundation at the fixed end are all fixed on the corresponding longitudinal beam, and the sliding end support structure includes N diagonal brace embedded foundations, N diagonal braces and 2N tie rods, the bottom end of each diagonal brace is fixed on the corresponding diagonal brace embedded foundation, and the top ends of N diagonal braces are respectively fixed on N longitudinal beams, Two tie rods arranged in parallel are hinged on each longitudinal beam. 3. The arch rib support system of a continuous asymmetrical thrustless arch bridge according to claim 1, characterized in that: the number of said arch ribs is M, and M is an integer not less than two, and said fixed end arch There are M rib foundations, and the fixed end of each arch rib is connected directly above a fixed end arch rib foundation. 4. The arch rib support system of a continuous asymmetric non-thrust arch bridge according to claim 1, characterized in that: the embedded foundation of diagonal braces is a triangular support block, and the bottom surface of the embedded foundation of diagonal braces is fixed on the foundation On the bearing platform, the bottom end of the diagonal brace is fixed on the outer oblique side of the embedded foundation of the diagonal brace. 5. The arch rib support system of a continuous asymmetric non-thrust arch bridge according to claim 1, characterized in that: the embedded foundation of the diagonal brace is fixedly connected with an anti-seismic spherical joint bearing, and the bottom end of the diagonal brace Fixed on the anti-seismic ball joint bearing. 6. The arch rib support system of a continuous asymmetric non-thrust arch bridge according to claim 1, characterized in that an upwardly extending lower ear plate is pre-embedded on the foundation cap, and the bridge deck is on the main girder An upper ear plate extending downward is welded, the top end of the pull rod is hinged with the upper ear plate through a pin shaft, and the bottom end of the pull rod is hinged with the lower ear plate through a pin shaft. 7. The installation method of the arch rib support system according to claim 1, characterized in that: it specifically includes the following steps: (1) First, pour the embedded foundation of diagonal braces on the foundation cap, and pre-embed the anchorage section on the embedded foundation of diagonal braces, then install the temporary support of diagonal braces on the side of the embedded foundation of diagonal braces, and then install Install the anti-seismic spherical joint bearing on the outer slope of the pre-buried foundation, weld and fix the bottom plate of the anti-seismic spherical joint support and the pre-embedded anchorage section of the pre-embedded foundation of the diagonal brace, and then lift the diagonal brace so that the diagonal brace is supported on the temporary support of the diagonal brace and temporarily fixed with the temporary support of the diagonal brace, and at the same time, the bottom end of the diagonal brace is supported on the anti-seismic spherical joint support, and then the bridge deck system is assembled, and the top of the diagonal brace is docked with the longitudinal beam of the bridge deck system. After the butt joint adjustment of the top and bottom ends is completed, temporarily fix the top and longitudinal beams of the diagonal brace with a code plate, and finally weld the bottom of the diagonal brace to the top plate of the anti-seismic spherical joint support, and release the temporary restraint of the anti-seismic spherical joint support , and then weld the top of the brace and the longitudinal beam to complete the installation of the brace; (2) Pre-buried multiple lower ear plates on the foundation cap, welded upper ear plates at the bottom of each longitudinal beam, and then hoisted the tie rods so that the tie rods were vertical and the ear holes at the upper end overlapped with the ear holes on the corresponding upper ear plates , after accurately aligning the holes, immediately penetrate the pin shaft on the upper ear plate, and then adjust the position of the bottom end of the tie rod so that the ear hole at the lower end overlaps with the corresponding ear hole on the lower ear plate. Finally, tighten the nuts on the pin shafts of the upper lug plate and the lower lug plate to complete the installation of the tie rod. 8. The installation method of the arch rib support system according to claim 7, characterized in that: in the step (2), the top of the pull rod is bound and fixed with the steel wire rope, and the bottom end of the bridge deck system is located on the side of the upper ear plate There are lifting lugs installed on the side, and the wire rope passes through the lifting lugs. By pulling the wire rope, the top of the pull rod is slowly lifted, and the air posture of the pull rod is adjusted, so that the ear hole at the upper end of the pull rod overlaps with the ear hole on the corresponding upper ear plate. After the holes are accurately aligned, immediately wear Insert the pin shaft on the upper lug plate, and then adjust the air posture of the pull rod by pulling the bottom end of the pull rod through the hand chain hoist, so that the ear hole at the lower end overlaps with the ear hole on the corresponding lower lug plate. After the holes are accurately aligned, immediately penetrate into the lower lug plate pin shaft.

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