Method for constructing a segment of a tangent circle s-shaped reverse bridge

Abstract

The application discloses a kind of tangential circle s-shaped reverse bridge section integral construction method, comprising the following steps: tangential circle s-shaped reverse bridge section is divided into upward tangential circle bridge section and downward tangential circle bridge section along the tangent direction of adjacent two tangential circles;Upward tangential circle bridge section is constructed using push method;After the construction of upward tangential circle bridge section is completed, downward tangential circle bridge section is constructed using hoisting method at the adjacent end of upward tangential circle bridge section;The application is to solve the problem of insufficient width of bridge pier in curve pushing in the initial stage of pushing, the top of fixed support is widened as pushing platform, and the steel box girder is placed on the pushing platform after assembly, and the girder is dropped after pushing installation, temporary support is arranged at each pushing point of downward tangential circle bridge section, and the steel box girder is hoisted and installed, the temporary support structure is removed and the girder is dropped after the assembly of the bridge section is completed, so as to complete the construction of tangential circle s-shaped reverse bridge section.

Description

Technical Field

[0001] This invention relates to a method for the overall construction of a tangent circular S-shaped reverse bridge segment, belonging to the field of bridge construction technology. Background Technology

[0002] With the rapid development of infrastructure construction in my country, the construction of highways, railways, and urban bridges faces many challenges, such as complex bridge alignments and the need to cross existing lines. In particular, in recent years, in order to achieve rapid traffic flow conversion between existing expressways, a large number of interchanges have been built in various places, characterized by varied alignments, high piers, and high construction difficulty.

[0003] For bridge construction spanning existing railway lines, the incremental launching method has minimal impact on the existing lines. This method requires no scaffolding or large machinery, offers stable construction, and is fast without disrupting traffic below the bridge, making it one of the most common construction methods for this type of project. However, for bridge sections with complex alignments, such as those with tangent circles and S-shaped reverse sections, a combination of construction methods is necessary. Currently, there is very little research on the construction techniques for S-shaped reverse bridge sections. This is because an S-shaped reverse bridge section consists of one section at an upward tangent circle and another at a downward tangent circle, and the incremental launching method alone cannot solve the alignment problem. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for the overall construction of a tangent circular S-shaped reverse bridge segment, so as to solve the technical problems mentioned in the prior art.

[0005] A method for integral construction of a tangent circular S-shaped reverse bridge segment includes the following steps:

[0006] The tangent circle S-shaped reverse bridge segment is divided into an upward tangent circle bridge segment and a downward tangent circle bridge segment along the tangent direction of two adjacent tangent circles;

[0007] The upward tangent circular bridge segment was constructed using the incremental launching method.

[0008] After the upward tangent circular bridge segment is constructed, the downward tangent circular bridge segment is constructed at the adjacent end of the upward tangent circular bridge segment using a hoisting method.

[0009] Optionally, the method of constructing the upward tangent circular bridge segment using the incremental launching method includes:

[0010] According to the design drawings, several fixed foundations are poured, and the several fixed foundations are evenly distributed on the ground along the arc trajectory of the upward tangent circular bridge segment;

[0011] A fixed support is installed on each of the fixed foundations, and a first adjustment section is installed at the top of the fixed support. The top surface elevation of several of the first adjustment sections is adjusted to a preset height.

[0012] Four I-beams are longitudinally arranged at the top of several first adjustment sections along the arc trajectory of the upward tangent circular bridge section as load-bearing beams, and H-beams are laid at the top of the load-bearing beams as jacking platforms.

[0013] A set of guide beams is installed on both sides of the top of the jacking platform along the arc trajectory of the upward tangent circular bridge segment. The top of the jacking platform is located between the opposite surfaces of the two sets of guide beams to form a steel box girder filling area. Multiple sets of steel box girders are pushed from one end of the two sets of guide beams to the other end until the multiple sets of steel box girders fill the steel box girder filling area. Then the guide beams are disassembled, and a base is installed on the surface of the steel box girder and the girder is poured.

[0014] Optionally, the method for constructing the downwardly tangent circular bridge segment using a hoisting method includes:

[0015] According to the design drawings, several temporary foundations are poured, and the several temporary foundations are evenly distributed on the ground along the arc trajectory of the downward tangent circular bridge segment;

[0016] Temporary supports are installed on each of the temporary foundations, and a second adjustment section is installed at the top of each temporary support. The top surface elevation of several second adjustment sections is adjusted to a preset height.

[0017] Three I-beams are set as transverse distribution beams along the transverse length of the downward tangent circular bridge section at the top of several second adjustment sections. Multiple Bailey beams are set longitudinally at the top of the transverse distribution beams. Several H-beams are installed sequentially at the top of the multiple Bailey beams along the arc trajectory of the downward tangent circular bridge section as bottom support beams for the box girder.

[0018] Several steel box girders are hoisted onto the bottom support beam of the box girder by a crane and assembled sequentially. The steel box girders located at the adjacent ends of the downward tangent circular bridge section and the upward tangent circular bridge section are assembled together. Then the temporary support is removed, and the base is installed on the surface of the steel box girder and the girder is poured and lowered.

[0019] Optionally, the pouring construction method for the fixed foundation and the temporary foundation is as follows:

[0020] Based on the preset locations of the fixed foundation and the temporary foundation, GPS or a total station is used to measure, locate, and lay out the fixed foundation and the temporary foundation. Then, an excavator is used to excavate the foundation pit in layers at the preset locations of the fixed foundation and the temporary foundation.

[0021] In each of the foundation pits, the installation positions of the steel pipe columns are measured and marked out. After the marking out, drilling equipment is used to drill multiple sets of corresponding pre-embedded holes at the corresponding installation positions of the steel pipe columns. The bottoms of the multiple steel pipe columns are inserted into the pre-embedded holes respectively, and mortar is injected into each steel pipe column. The mortar is filled from the bottom of the steel pipe column into the pre-embedded holes.

[0022] The portions of the multiple steel pipe columns reserved outside the pre-embedded holes are bound together with foundation steel bars to form a rectangular steel cage. Support formwork is installed around the rectangular steel cage, and concrete is poured into the rectangular steel cage to form the fixed foundation or the temporary foundation.

[0023] Optionally, the method for installing the fixed bracket includes:

[0024] Six sets of base plates are arranged in a rectangle at the top of the fixed foundation. The installation position of the pre-embedded steel bars of each base plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the fixed foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and the pre-embedded steel bars are inserted.

[0025] The six sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. Several steel pipe columns are then stacked and installed in sequence along the vertical direction through the flanges, and the six sets of steel pipe columns are then reinforced and connected in sequence along the horizontal direction through shear bracing, so that the six sets of steel pipe columns are assembled into a fixed support.

[0026] Optionally, the method for installing the temporary support includes:

[0027] Eight sets of seat plates are arranged in a rectangle at the top of the temporary foundation. The installation position of the pre-embedded steel bars of each seat plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the temporary foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and pre-embedded steel bars are inserted.

[0028] The eight sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. Several steel pipe columns are then stacked and installed in sequence along the vertical direction through the flanges, and the eight sets of steel pipe columns are then reinforced and connected in sequence along the horizontal direction through shear bracing, so that the eight sets of steel pipe columns are assembled into a temporary support.

[0029] Optionally, the upright formwork is straightened by a string line method and verticality is controlled by a plumb bob method.

[0030] Optionally, the concrete is poured using a chute and compacted using an immersion vibrator.

[0031] Optionally, when excavating the foundation pit, the excavator slopes the pit at a ratio of 1:1-2.

[0032] The beneficial effects that this invention can produce include:

[0033] This invention provides a method for the overall construction of a tangent circular S-shaped reverse bridge segment, applicable to the construction of such segments. First, the upward tangent circular bridge segment is constructed. At the initial jacking stage, to address the insufficient lateral width of the piers during curved jacking, the top of the fixed support is widened to serve as a jacking platform. Then, according to the steel box girder assembly plan, the box girders are assembled. After assembly, they are placed on the jacking platform and jacked. Once pushed to the end of the jacking platform, the widened and heightened structure is removed, and the girder is lowered. Next, temporary supports are arranged at each jacking point of the downward tangent circular bridge segment, and hoisting installation is performed. After hoisting, the girder is lowered. Once the upward tangent circular bridge segment and the downward tangent circular bridge segment are assembled using the jacking method and the hoisting method, the temporary support structure is removed, the girder is lowered, and the site is cleared, thus completing the construction of the tangent circular S-shaped reverse bridge segment. Attached Figure Description

[0034] Figure 1 This is a flowchart of a method for the overall construction of a tangent circular S-shaped reverse bridge segment according to the present invention;

[0035] Figure 2 This invention relates to a bridge segment structure for an overall construction method of a tangent circular S-shaped reverse bridge segment. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the embodiments, but the present invention is not limited to these embodiments.

[0037] like Figure 1 As shown, the present invention provides a method for the overall construction of a tangent circular S-shaped reverse bridge segment, comprising the following steps:

[0038] The tangent circle S-shaped reverse bridge segment is divided into an upward tangent circle bridge segment and a downward tangent circle bridge segment along the tangent direction of two adjacent tangent circles;

[0039] The upward tangent circular bridge segment was constructed using the incremental launching method;

[0040] After the upward tangent circular bridge segment is completed, the downward tangent circular bridge segment is constructed at the adjacent end of the upward tangent circular bridge segment using the hoisting method.

[0041] Furthermore, the method of constructing the upward tangent circular bridge segment using the incremental launching method includes:

[0042] Several fixed foundations are poured according to the design drawings. The fixed foundations are evenly distributed on the ground along the arc trajectory of the upward tangent circular bridge segment.

[0043] A fixed support is installed on each fixed foundation. The top of the fixed support is equipped with a first adjustment section, and the top surface elevation of several first adjustment sections is adjusted to a preset height.

[0044] Four 560 I-beams are longitudinally arranged along the arc trajectory of the upward tangent circular bridge section at the top of several first adjustment sections as load-bearing beams, and 450 H-beams are laid on the top of the load-bearing beams as jacking platforms.

[0045] A set of guide beams is installed on both sides of the top of the jacking platform along the arc trajectory of the upward tangent circular bridge section. The top of the jacking platform is located between the opposite faces of the two sets of guide beams to form a steel box girder filling area. Multiple sets of steel box girders are pushed from one end of the two sets of guide beams to the other end until the multiple sets of steel box girders fill the steel box girder filling area. Then the guide beams are removed, and a base is installed on the surface of the steel box girder and the girder is poured.

[0046] Furthermore, the construction method for the downward tangent circular bridge segment using the hoisting method includes:

[0047] Several temporary foundations are poured according to the design drawings. The temporary foundations are evenly distributed on the ground along the arc trajectory of the downward tangent circular bridge segment.

[0048] Temporary supports are installed on each temporary foundation, and a second adjustment section is installed at the top of the temporary supports. The top surface elevation of several second adjustment sections is adjusted to a preset height.

[0049] Three 560 I-beams (made of Q235B material) are set along the transverse length of the downward tangent circular bridge section at the top of several second adjustment sections as transverse distribution beams. Multiple Bailey beams are set longitudinally at the top of the transverse distribution beams. Several 200H-beams are installed sequentially along the arc trajectory of the downward tangent circular bridge section at the top of the multiple Bailey beams as bottom support beams for the box girder.

[0050] Several steel box girders are hoisted onto the bottom support beams of the box girder by a crane and then spliced ​​and assembled in sequence. The steel box girders located at the adjacent ends of the downward tangent circular bridge section and the upward tangent circular bridge section are assembled together. Then the temporary supports are removed, and the base is installed on the surface of the steel box girder and the girder is poured and lowered.

[0051] In the above, the Bailey beam is assembled by welding φ219*8mm steel pipes with shear bracing, and the Bailey beam is widened along the construction section at the required position to form a section and adjust the longitudinal and transverse slopes.

[0052] It should be noted that after each group of steel box girders is spliced ​​and assembled,

[0053] Furthermore, the pouring construction methods for fixed foundations and temporary foundations are as follows:

[0054] Based on the preset locations of the fixed foundation and the temporary foundation, GPS or a total station is used to measure, locate, and lay out the fixed foundation and the temporary foundation. Then, an excavator is used to excavate the foundation pit in layers at the preset locations of the fixed foundation and the temporary foundation.

[0055] The installation positions of the steel pipe columns in each foundation pit are measured and marked out. After the marking out, drilling equipment is used to drill multiple sets of corresponding pre-embedded holes at the corresponding installation positions of the steel pipe columns. The bottoms of multiple steel pipe columns are inserted into the pre-embedded holes respectively. The steel pipe columns are made of 6mm seamless steel pipes, and 108 seamless steel pipes are evenly distributed in each foundation pit. M30 mortar is injected into each steel pipe column and the mortar is filled from the bottom of the steel pipe column into the pre-embedded holes.

[0056] The portion of multiple steel pipe columns pre-reserved outside the pre-embedded holes is bound together with foundation steel bars to form a rectangular steel cage. The foundation steel bars are connected to the steel pipe columns in the horizontal direction using φ20 steel bars, and the foundation steel bars are driven into the foundation to a depth of 50cm in the vertical direction. Formwork is installed around the rectangular steel cage, and then concrete is poured into the rectangular steel cage to form a fixed foundation or temporary foundation.

[0057] Furthermore, the installation method of the fixed bracket includes:

[0058] Six sets of base plates are arranged in a rectangle at the top of the fixed foundation. The installation position of the pre-embedded steel bars of each base plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the fixed foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and the pre-embedded steel bars are inserted.

[0059] The six sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. At the same time, L-shaped reinforcing bars are welded to reinforce the seat plates and flanges. Then, several steel pipe columns are installed in sequence along the vertical direction through the flanges, and the six sets of steel pipe columns are reinforced and connected in sequence along the horizontal direction through shear bracing, so that the six sets of steel pipe columns are assembled into a fixed support.

[0060] Furthermore, the installation method of the temporary support includes:

[0061] Eight sets of seat plates are arranged in a rectangle at the top of the temporary foundation. The installation position of the pre-embedded steel bars of each seat plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the temporary foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and the pre-embedded steel bars are inserted.

[0062] Eight sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. At the same time, L-shaped reinforcing bars are welded to reinforce the seat plates and flanges. Then, several steel pipe columns are installed in sequence along the vertical direction through the flanges, and the eight sets of steel pipe columns are reinforced and connected in sequence along the horizontal direction through shear bracing, so that the eight sets of steel pipe columns are assembled into a temporary support.

[0063] Furthermore, the horizontality of the erected formwork is adjusted using the stringing method, and the verticality is controlled using the plumb bob method.

[0064] Furthermore, the concrete is poured using a chute and compacted using an immersion vibrator.

[0065] Furthermore, when excavating the foundation pit, the excavator slopes the pit at a ratio of 1:1.

[0066] It should be noted that the excavation dimensions of the foundation pit should meet the requirements of the foundation construction, and drainage facilities, such as drainage ditches, should be in place. Furthermore, the base of the foundation pit should be 1cm wider than the planar dimensions of the foundation design.

[0067] In the above, refer to Figure 2 As shown, the tangent circular S-shaped reverse bridge segment is divided into five construction segments. The first, second, and third construction segments are designated as downward tangent circular bridge segments, while the third and fourth construction segments are designated as upward tangent circular bridge segments. Several sets of fixed supports are installed below the upward tangent circular bridge segments, and several sets of temporary supports are installed below the downward tangent circular bridge segments.

[0068] This invention discloses a bridge construction method for a tangent circular bridge segment with reverse S-shaped structure. The method involves first constructing the upward tangent circular bridge segment. At the initial jacking stage, to address the insufficient lateral width of the piers during curved jacking, the top of the fixed support is widened to serve as a jacking platform. Then, according to the steel box girder assembly plan, the box girders are assembled. After assembly, they are placed on the jacking platform and jacked. Once pushed to the end of the jacking platform, the widened and heightened structure is removed, and the girder is lowered. Temporary supports are then arranged at each jacking point of the downward tangent circular bridge segment, and hoisting installation is performed. After hoisting, the girder is lowered. Once the upward tangent circular bridge segment and the downward tangent circular bridge segment are assembled using the jacking method and the hoisting method, the temporary support structure is removed, the girder is lowered, and the site is cleared, thus completing the construction of the tangent circular bridge segment with reverse S-shaped structure.

[0069] The above description is merely a few embodiments of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the technical solution of the present invention using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for integral construction of a tangent circular S-shaped reverse bridge segment, characterized in that, Includes the following steps: The tangent circle S-shaped reverse bridge segment is divided into an upward tangent circle bridge segment and a downward tangent circle bridge segment along the tangent direction of two adjacent tangent circles; The upward tangent circular bridge segment was constructed using the incremental launching method. After the upward tangent circular bridge segment is constructed, the downward tangent circular bridge segment is constructed at the adjacent end of the upward tangent circular bridge segment using a hoisting method. The method of constructing the upward tangent circular bridge segment using the incremental launching method includes: According to the design drawings, several fixed foundations are poured, and the several fixed foundations are evenly distributed on the ground along the arc trajectory of the upward tangent circular bridge segment; A fixed support is installed on each of the fixed foundations, and a first adjustment section is installed at the top of the fixed support. The top surface elevation of several of the first adjustment sections is adjusted to a preset height. Four I-beams are longitudinally arranged at the top of several first adjustment sections along the arc trajectory of the upward tangent circular bridge section as load-bearing beams, and H-beams are laid at the top of the load-bearing beams as jacking platforms. A set of guide beams is installed on both sides of the top of the jacking platform along the arc trajectory of the upward tangent circular bridge segment. The top of the jacking platform is located between the opposite surfaces of the two sets of guide beams to form a steel box girder filling area. Multiple sets of steel box girders are pushed from one end of the two sets of guide beams to the other end until the multiple sets of steel box girders fill the steel box girder filling area. Then the guide beams are disassembled, and a base is installed on the surface of the steel box girder and the girder is poured. The method for constructing the downward tangent circular bridge segment using the hoisting method includes: According to the design drawings, several temporary foundations are poured, and the several temporary foundations are evenly distributed on the ground along the arc trajectory of the downward tangent circular bridge segment; Temporary supports are installed on each of the temporary foundations, and a second adjustment section is installed at the top of each temporary support. The top surface elevation of several second adjustment sections is adjusted to a preset height. Three I-beams are set as transverse distribution beams along the transverse length of the downward tangent circular bridge section at the top of several second adjustment sections. Multiple Bailey beams are set longitudinally at the top of the transverse distribution beams. Several H-beams are installed sequentially at the top of the multiple Bailey beams along the arc trajectory of the downward tangent circular bridge section as bottom support beams for the box girder. Several steel box girders are hoisted onto the bottom support beam of the box girder by a crane and assembled sequentially. The steel box girders located at the adjacent ends of the downward tangent circular bridge section and the upward tangent circular bridge section are assembled together. Then the temporary support is removed, and the base is installed on the surface of the steel box girder and the girder is poured and lowered.

2. The method for integral construction of a tangent circular S-shaped reverse bridge segment according to claim 1, characterized in that, The pouring construction methods for the fixed foundation and the temporary foundation are as follows: Based on the preset locations of the fixed foundation and the temporary foundation, GPS or a total station is used to measure, locate, and lay out the fixed foundation and the temporary foundation. Then, an excavator is used to excavate the foundation pit in layers at the preset locations of the fixed foundation and the temporary foundation. In each of the foundation pits, the installation positions of the steel pipe columns are measured and marked out. After the marking out, drilling equipment is used to drill multiple sets of corresponding pre-embedded holes at the corresponding installation positions of the steel pipe columns. The bottoms of the multiple steel pipe columns are inserted into the pre-embedded holes respectively, and mortar is injected into each steel pipe column. The mortar is filled from the bottom of the steel pipe column into the pre-embedded holes. The portions of the multiple steel pipe columns reserved outside the pre-embedded holes are bound together with foundation steel bars to form a rectangular steel cage. Support formwork is installed around the rectangular steel cage, and concrete is poured into the rectangular steel cage to form the fixed foundation or the temporary foundation.

3. The integral construction method for a tangent circular S-shaped reverse bridge segment according to claim 2, characterized in that, The installation method of the fixed bracket includes: Six sets of base plates are arranged in a rectangle at the top of the fixed foundation. The installation position of the pre-embedded steel bars of each base plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the fixed foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and the pre-embedded steel bars are inserted. The six sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. Several steel pipe columns are then stacked and installed in sequence along the vertical direction through the flanges. The six sets of steel pipe columns are then reinforced and connected in sequence along the horizontal direction through shear bracing, so that the six sets of steel pipe columns are assembled into a fixed support.

4. The integral construction method for a tangent circular S-shaped reverse bridge segment according to claim 2, characterized in that, The method for installing the temporary support includes: Eight sets of seat plates are arranged in a rectangle at the top of the temporary foundation. The installation position of the pre-embedded steel bars of each seat plate is measured and laid out. After the layout is completed, corresponding pre-embedded holes are opened on the surface of the temporary foundation. Rebar anchoring adhesive is poured into the pre-embedded holes and pre-embedded steel bars are inserted. The eight sets of seat plates are welded to the top of the corresponding pre-embedded steel bars, and flanges are welded to the top of the seat plates. Several steel pipe columns are then stacked and installed in sequence along the vertical direction through the flanges, and the eight sets of steel pipe columns are then reinforced and connected in sequence along the horizontal direction through shear bracing, so that the eight sets of steel pipe columns are assembled into a temporary support.

5. The method for integral construction of a tangent circular S-shaped reverse bridge segment according to claim 2, characterized in that, The erected formwork is straightened using the stringing method and its verticality is controlled using the plumb bob method.

6. The integral construction method for a tangent circular S-shaped reverse bridge segment according to claim 2, characterized in that, The concrete is poured using a chute and compacted using an immersion vibrator.

7. The method for integral construction of a tangent circular S-shaped reverse bridge segment according to claim 2, characterized in that, When the excavator is excavating the foundation pit, it slopes the pit at a ratio of 1:1 to 1:2.

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