Construction Method of Long-Span Tied Arch Bridge

Abstract

The invention discloses a construction method of a long-span tied arch bridge, comprising the following steps: step 1, processing an arch rib segment, an arch foot seat, an arch rib bracket, and a steel beam segment in a factory; step 2, installing the arch foot seats on both sides after constructing the foundation; step 3, symmetrically constructing two supporting piers between the arch foot seats on both sides under the bridge; step 4, assembling and constructing a steel beam segment on the two supporting piers and a pair of arch foot seats to form a steel beam; step 5, installing an arch rib bracket on the completed steel beam, and completing the installation of the arch rib segment by assembling the arch rib bracket in sequence to form an arch rib; step 6, installing a tie rod between the arch rib and the steel beam to complete the construction of the entire tied arch bridge. The invention performs rapid assembly construction to realize the rapid erection of the tied arch bridge, and at the same time, auxiliary erection is performed by a barge arranged under the bridge, and the bridge construction can be realized without using a large number of temporary piers and a large number of brackets, and the normal navigation under the bridge is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more specifically, to a construction method of a long-span tied-arch bridge. Background Art

[0002] At present, there are two main methods for the construction of tied arch bridges, one is to build the arch first and then the beam, and the other is to build the beam first and then the arch. Both methods have their own advantages and disadvantages. The large-span tied arch bridge of this application is located in a deep water and a navigation channel. It is not suitable to use the existing method of setting up a large number of temporary piers or a large number of brackets to assist the construction of tied arch bridges. This application intends to use the construction plan of building the bridge first and then the arch. How to achieve rapid construction without affecting navigation under the bridge during the construction process is the core technical problem to be solved in this application. Summary of the invention

[0003] One object of the present invention is to provide a construction method for a large-span tie-arch bridge, which uses three-section arch ribs for rapid assembly construction to achieve rapid erection of the tie-arch bridge, while auxiliary erection is performed by a barge set under the bridge, so that bridge construction can be achieved without using a large number of temporary piers and a large number of supports, and normal navigation under the bridge is not affected.

[0004] In order to achieve these purposes and other advantages according to the present invention, a construction method of a long-span tied arch bridge is provided, characterized in that it includes the following steps:

[0005] Step 1: Process the basic parts in the factory, including arch rib segments, arch foot seats, arch rib brackets, and steel beam segments;

[0006] Step 2: According to the design requirements, measure and locate the actual positions of the arch footings on both sides of the bridge deck, and after constructing the foundation, install the arch footings on both sides on the foundation;

[0007] Step 3: According to the design requirements, two supporting piers are constructed symmetrically between the arch footings on both sides of the bridge;

[0008] Step 4: Assemble and construct the steel beam segments on two supporting piers and a pair of arch foot seats to form a steel beam;

[0009] Step 5: Install the arch rib bracket on the completed steel beam, and install the arch rib segments by assembling the arch rib brackets in sequence to form the arch rib;

[0010] Step 6: Install tie rods between the arch ribs and steel beams to complete the construction of the entire tied arch bridge.

[0011] Preferably, the specific steps of the construction of the steel beam in step 4 are:

[0012] First, two temporary barges are set up under the bridge. The two temporary barges are moved to between the arch foot seat and the adjacent supporting piers, and support frames are set up on the temporary barges.

[0013] Secondly, after installing the guide beam from the outside of the arch foot seat, the steel beam segment is pushed through the support frame and supporting pier on the temporary barge in sequence by jacking, and the jacking installation of the steel beam segment is completed. After the steel beam segments on both sides are installed simultaneously, the temporary barge and the support frame on it are withdrawn;

[0014] Finally, the two temporary barges were moved between the two supporting piers and the supporting frames were installed. The crane installed on the temporary barge assisted in lifting the middle steel beam segment between the two supporting piers. The steel beam segment was temporarily overlapped on the supporting frames of the two temporary barges and then assembled and connected with the installed steel beam segments on both sides to complete the construction of the entire steel beam.

[0015] Preferably, the specific steps of constructing the arch rib in step 5 are:

[0016] First, install the arch rib bracket on the completed steel beam according to the design requirements;

[0017] Secondly, under the support of the arch rib bracket, the arch rib segments are transported from both sides to the steel beam, and the arch rib segments are hoisted to the arch rib bracket with the help of the crane on the temporary barge. The arch rib segments at the arch foot seats on both sides are installed first, and the arch rib segments on both sides are installed simultaneously. After the initial positioning of the arch rib segments and during the installation of the arch foot seats, the crane exerts a lifting force on the arch rib segments on both sides.

[0018] Finally, after the arch rib segments on both sides are installed, the temporary barge is moved, and the middle arch rib segment is installed on the arch rib bracket with the assistance of the crane installed on the temporary barge. When the middle arch rib segment is connected and assembled with the arch rib segments on both sides, the crane applies lifting force to the middle arch rib segment until the assembly of the entire arch rib is completed.

[0019] Preferably, one arch rib support is provided on each side, and two are symmetrically provided in the middle.

[0020] Preferably, the foundation in step 2 is a concrete foundation, a cap and a bridge pier arranged in sequence from underground to the ground below the arch foot seat, and the arch foot seat is installed on the bridge pier.

[0021] Preferably, the arch foot seat comprises:

[0022] A seat body, which is fixed on the bridge pier and is provided with a hinged seat;

[0023] An adjusting seat, the lower end of which is hingedly arranged with the hinge seat, a matching groove is arranged on the top of the adjusting seat, the end of the arch rib segment is just fitted and inserted into the matching groove, and the hinge seat and the adjusting seat are located in the same direction;

[0024] An adjusting oil cylinder, whose cylinder body is fixed on the seat body, and whose telescopic rod is supported on the adjusting seat;

[0025] The movable pad is movably inserted into the gap between the adjusting seat and the hinge seat.

[0026] Preferably, a three-way jack is fixedly provided on the top of the arch rib support, a positioning block is fixedly provided on the top thereof, and the top of the positioning block has a snap-fitting groove in which the arch rib segment is just snap-fitted.

[0027] The present invention has at least the following beneficial effects:

[0028] 1. The present invention divides the arch rib of the entire tied arch bridge into three sections for advance processing, and directly assembles them after transporting them to the construction site. Compared with the traditional multi-section assembly, the construction efficiency is greatly improved.

[0029] 2. When the steel beams and arch ribs are erected, the present invention does not set a large number of temporary piers or a large number of installation brackets, and auxiliary erection is performed by temporary barges under the bridge, thereby not affecting the normal navigation under the bridge.

[0030] 3. The temporary barge of the present invention is provided with a crane, which assists in the hoisting of the arch ribs, thereby reducing the number of arch rib brackets on the steel beams and avoiding excessive pressure on the steel beams by a large number of arch rib brackets, thereby achieving rapid assembly construction of the arch rib segments.

[0031] 4. The present invention is provided with a positioning adjustment structure on the arch foot seat to achieve the initial positioning of the arch rib segments on both sides. In addition, a positioning adjustment structure is provided on the arch rib bracket to achieve rapid and accurate assembly of the arch rib segments, thereby improving the efficiency and accuracy of assembly.

[0032] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of step 2 and step 3 of the present invention;

[0034] Figure 2 This is a schematic diagram of the installation of the steel beam segments on both sides of step 4 of the present invention;

[0035] Figure 3 This is a schematic diagram of the installation of the middle steel beam segment in step 4 of the present invention;

[0036] Figure 4 It is a schematic diagram of the installation of the arch rib segments on both sides in step five of the present invention;

[0037] Figure 5 This is a schematic diagram of the installation of the middle arch rib segment in step five of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the arch foot seat of the present invention;

[0039] Figure 7 It is a schematic structural diagram of the arch rib support of the present invention.

[0040] Description of reference numerals:

[0041] 1. Arch rib segment, 2. Arch foot seat, 201. Seat body, 202. Articulated seat, 203. Adjusting seat, 204. Matching groove, 205. Adjusting cylinder, 206. Movable pad, 3. Arch rib bracket, 301. Three-way jack, 302. Positioning block, 4. Steel beam segment, 5. Support pier column, 6. Temporary barge, 7. Concrete foundation, 8. Cap, 9. Pier, 10. Support frame, 11. Guide beam, 12. Crane. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0043] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] like Figures 1 to 5 As shown, the present invention provides a construction method for a long-span tied arch bridge, comprising the following steps:

[0045] Step 1: Process the basic parts in the factory, including the arch rib segment 1, the arch foot seat 2, the arch rib bracket 3, and the steel beam segment 4. The basic parts that can be processed are prefabricated in the factory or on the construction site in advance and can be directly used and installed during the construction process, which improves the construction efficiency and shortens the construction period.

[0046] Step 2: Figure 1As shown, according to the design requirements, the actual positions of the arch foot seats 2 on both sides of the bridge deck are measured and located, and after the foundation is constructed, the arch foot seats 2 on both sides are installed on the foundation. The positions of the arch foot seats 2 must be very accurate, so as to ensure the accuracy of the subsequent installation of steel beams and arch ribs, and realize the successful and accurate construction of the entire bridge;

[0047] Step 3: Figure 1 As shown, according to the design requirements, two supporting piers 5 are symmetrically constructed between the arch foot seats 2 on both sides of the bridge. Compared with the traditional arrangement of multiple supporting piers 5, the supporting piers 5 of the present application are fewer, thereby achieving maximum non-influence on navigation under the bridge;

[0048] Step 4: Figure 2 and Figure 3 As shown, the steel beam segment 4 is assembled and constructed on two supporting piers 5 and a pair of arch foot seats 2 to form a steel beam;

[0049] Step 5: Figure 4 and Figure 5 As shown, the arch rib bracket 3 is installed on the completed steel beam, and the arch rib segment 1 is installed by assembling the arch rib bracket 3 in sequence to form an arch rib;

[0050] Step 6: Install tie rods between the arch ribs and steel beams to complete the construction of the entire tied arch bridge.

[0051] In another technical solution, Figure 2 and Figure 3 As shown, the specific steps of the construction of the steel beam in step 4 are:

[0052] First, two temporary barges 6 are arranged under the bridge, and the two temporary barges 6 under the bridge are moved to between the arch foot seat 2 and the adjacent supporting pier 5, and a supporting frame 10 is arranged on the temporary barges 6;

[0053] Secondly, after installing the guide beam 11 from the outside of the arch foot seat 2, the steel beam segment 4 is pushed through the support frame 10 and the support pier 5 on the temporary barge 6 in sequence to complete the push installation of the steel beam segment 4. After the steel beam segments 4 on both sides are installed simultaneously, the temporary barge 6 and the support frame 10 thereon are withdrawn;

[0054] Finally, the two temporary barges are moved between the two supporting piers 5, and the supporting frame 10 is installed. The crane 12 set on the temporary barge 6 is used to assist in lifting the middle steel beam segment 4 between the two supporting piers 5, and the steel beam segment 4 is temporarily overlapped on the supporting frames 10 of the two temporary barges 6, and then assembled and connected with the installed steel beam segments 4 on both sides to complete the construction of the entire steel beam.

[0055] In the above technical solution, by taking advantage of the water, since the water in this application project is deep and the water surface is relatively stable, a temporary barge 6 is set up, and a support frame 10 is set up on the temporary barge 6 to act as a temporary pier to push and install the steel beam segment 4. Compared with the traditional construction method, this application does not need to set up temporary piers and then dismantle them, which improves the construction efficiency, saves construction costs, and reduces the intensity of workers' construction. The steel beam segment 4 of this application can be constructed in three stages with the assistance of the temporary barge 6, which improves the assembly efficiency. After the steel beam segments 4 on both sides are fixed, the middle steel beam segment 4 is installed, so that the construction of the entire steel beam is completed. A pedestrian walkway and a construction platform are set up on the support frame 10 to facilitate construction personnel to assist in the installation of the steel beam segment 4 from the temporary barge 6.

[0056] In another technical solution, Figure 4 and Figure 5 As shown, the specific steps of the construction of the arch rib in step 5 are:

[0057] First, the arch rib bracket 3 is installed on the completed steel beam according to the design requirements;

[0058] Secondly, under the support of the arch rib bracket 3, the arch rib segments 1 are transported from both sides to the steel beam, and the arch rib segments 1 are lifted to the arch rib bracket 3 with the assistance of the crane 12 on the temporary barge 6. The arch rib segments 1 at the arch foot seats 2 on both sides are installed first, and the arch rib segments 1 on both sides are installed synchronously at the same time. After the arch rib segments 1 are initially positioned and during the installation of the arch foot seats 2, the crane 12 exerts lifting force on the arch rib segments 1 on both sides.

[0059] Finally, after the arch rib segments 1 on both sides are installed, the temporary barge 6 is moved, and the middle arch rib segment 1 is assisted by the crane 12 installed on the temporary barge 6 and installed on the arch rib bracket 3. When the middle arch rib segment 1 is connected and assembled with the arch rib segments 1 on both sides, the crane 12 applies a lifting force to the middle arch rib segment 1 until the assembly of the entire arch rib is completed.

[0060] The arch rib brackets 3 are arranged one on each side and two symmetrically in the middle.

[0061] In the above technical solution, after the steel beam is constructed, the arch rib is constructed on the steel beam, the arch rib segment 1 is initially positioned by the arch rib bracket 3 installed on the steel beam, and then assembled, the crane 12 on the temporary barge 6 assists in lifting the arch rib segment 1, and a certain lifting force is applied during the assembly process, so that the pressure of the arch rib segment 1 on the steel beam is reduced, protecting the steel beam segment 4, and the magnitude of the lifting force applied does not affect the assembly line of the arch rib segment 1. The auxiliary lifting and application of the lifting force by the crane 12 make the number of arch rib brackets 3 set less than that of the traditional arch rib brackets 3.

[0062] In another technical solution, the foundation in step 2 is a concrete foundation 7, a cap 8 and a pier 9 arranged in sequence from underground to the ground below the arch foot seat 2, and the arch foot seat 2 is installed on the pier 9.

[0063] In another technical solution, Figure 6 As shown, the arch foot seat 2 includes:

[0064] A seat body 201 is fixed on the bridge pier 9, and a hinge seat 202 is provided on the seat body 201;

[0065] The lower end of the adjusting seat 203 is hingedly connected to the hinge seat 202. The top of the adjusting seat 203 is provided with a matching groove 204. The end of the arch rib segment 1 is just inserted into the matching groove 204. The hinge seat 202 and the adjusting seat 203 are located in the same direction.

[0066] An adjusting oil cylinder 205, whose cylinder body is fixed on the seat body 201, and whose telescopic rod is supported on the adjusting seat 203;

[0067] The movable pad 206 is movably inserted into the gap between the adjustment seat 203 and the hinge seat 202 .

[0068] In the above technical solution, the installation accuracy of the arch rib segment 1 at the arch foot seat 2 is particularly important. Whether its accuracy meets the requirements will affect whether the entire bridge construction can be assembled normally. Insert the end of the arch rib segment 1 into the middle matching groove 204, and monitor the linear shape of the arch rib segment 1. If it does not meet the accuracy requirements, pull out the movable gasket, adjust the linear shape of the arch rib segment 1 by adjusting the extension of the oil cylinder 205, until the accuracy requirements are met, and insert and fix the entire arch foot seat 2 through the movable gasket. The size and thickness of the movable gasket are selected according to the actual requirements. The movable gasket can also be assembled by multiple basic gaskets. According to the size of the space between the adjustment seat 203 and the hinge seat 202 after adjustment, insert the appropriate number and thickness of basic gaskets.

[0069] In another technical solution, Figure 7 As shown, a three-way jack 301 is fixedly arranged on the top of the arch rib support, and a positioning block 302 is fixedly arranged on the top thereof. The top of the positioning block 302 has a snap-in groove in which the arch rib segment is just snap-in. By adjusting the three-way jack 301, the linear shape of the arch rib segment 1 snapped in the positioning block 302 can be adjusted, and the positioning arch rib segment 1 is initially snap-in positioned in the snap-in groove on the top of the arch rib support, and then the linear shape of the arch rib segment 1 is monitored, and according to the monitoring result, the linear shape of the arch rib segment is adjusted to meet the accuracy requirements.

[0070] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Construction method of long-span tied arch bridge, It is characterized in that The steps include: Step 1: Process the basic parts in the factory, including arch rib segments, arch foot seats, arch rib brackets, and steel beam segments; Step 2: According to the design requirements, measure and locate the actual positions of the arch footings on both sides of the bridge deck, and after constructing the foundation, install the arch footings on both sides on the foundation; Step 3: According to the design requirements, two supporting piers are constructed symmetrically between the arch footings on both sides of the bridge; Step 4: The specific steps are: First, two temporary barges are set up under the bridge. The two temporary barges are moved to between the arch foot seat and the adjacent supporting piers, and support frames are set up on the temporary barges. Secondly, after installing the guide beam from the outside of the arch foot seat, the steel beam segment is pushed through the support frame and supporting pier on the temporary barge in sequence by jacking, and the jacking installation of the steel beam segment is completed. After the steel beam segments on both sides are installed simultaneously, the temporary barge and the support frame on it are withdrawn; Finally, the two temporary barges are moved between the two supporting piers and the supporting frames are installed. The middle steel beam segment is lifted with the assistance of the crane installed on the temporary barge between the two supporting piers. The steel beam segment is temporarily overlapped on the supporting frames of the two temporary barges, and then assembled and connected with the installed steel beam segments on both sides to complete the construction of the entire steel beam. Step 5. The specific steps are: First, install the arch rib bracket on the completed steel beam according to the design requirements; Secondly, under the support of the arch rib bracket, the arch rib segments are transported from both sides to the steel beam, and the arch rib segments are hoisted to the arch rib bracket with the help of the crane on the temporary barge. The arch rib segments at the arch foot seats on both sides are installed first, and the arch rib segments on both sides are installed simultaneously. After the initial positioning of the arch rib segments and during the installation of the arch foot seats, the crane exerts a lifting force on the arch rib segments on both sides. Finally, after the arch rib segments on both sides are installed, the temporary barge is moved, and the middle arch rib segment is installed on the arch rib bracket with the assistance of the crane installed on the temporary barge. When the middle arch rib segment is connected and assembled with the arch rib segments on both sides, the crane applies a lifting force to the middle arch rib segment until the assembly of the entire arch rib is completed. Step 6: Install tie rods between the arch ribs and the steel beams to complete the construction of the entire tied arch bridge; The foundation in step 2 is a concrete foundation, a cap and a bridge pier arranged in sequence from underground to the ground below the arch foot seat, and the arch foot seat is installed on the bridge pier; The arch foot seat comprises: A seat body, which is fixed on the bridge pier and is provided with a hinged seat; An adjusting seat, the lower end of which is hingedly arranged with the hinge seat, a matching groove is arranged on the top of the adjusting seat, the end of the arch rib segment is just fitted and inserted into the matching groove, and the hinge seat and the adjusting seat are located in the same direction; An adjusting oil cylinder, the cylinder body of which is fixed on the seat body, and the telescopic rod of the adjusting oil cylinder is supported on the adjusting seat; The movable pad is movably inserted into the gap between the adjusting seat and the hinge seat.

2. The construction method of the long-span tied arch bridge according to claim 1, It is characterized in that One arch rib support is arranged on each side, and two are symmetrically arranged in the middle.

3. The construction method of the long-span tied arch bridge according to claim 1, It is characterized in that A three-way jack is fixedly arranged on the top of the arch rib bracket, and a positioning block is fixedly arranged on the top thereof. The top of the positioning block has a snap-fitting groove in which the arch rib segment is just snap-fitted.

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