Method for continuously pumping concrete in arch rib of tied-arch bridge

Abstract

The invention discloses a method for continuously pumping concrete in an arch rib of a tied arch bridge, which comprises the following steps of: prefabricating and assembling a steel pipe arch rib component and a transverse connecting system component thereof, and respectively performing trepanning and exhaust pipe welding on a top middle arch rib section and non-embedded arch rib sections on two sides according to a preset number and specific positions of exhaust holes; constructing a main body structure of the steel tube arch bridge, arranging arch rib supports matched with the tied arch bridge in radian on the tie beams, erecting the arch rib sections on the corresponding arch rib supports section by section, and welding the arch rib sections into a whole section by section; a concrete jacking system is arranged at the corresponding position of each pre-buried arch rib section; all the ground pumps are controlled to conduct jacking at the same time, the discharging condition of concrete from all the exhaust holes is observed, and if the concrete character is similar to that of concrete at a jacking inlet, the exhaust holes of the section are closed; and after the concrete reaches the highest exhaust hole, when the character of the concrete is consistent with that of the injected concrete, jacking operation is stopped, and continuous pumping operation of the concrete in the steel pipe arch rib of the tied-arch bridge is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and more specifically, relates to a method for continuously pumping concrete in an arch rib of a tied arch bridge. Background Art

[0002] In railway construction, due to the limitations of terrain conditions, it is common to use steel tube arch bridges with larger spans. Usually, steel tube arch bridges are divided into two construction methods: "beam first, then arch" and "arch first, then beam". But no matter which method is used, the steel tube arch must be filled with concrete to achieve the structural conditions of the rigid arch required by the design. In order to enable the jacking operation of the concrete in the steel tube arch to proceed continuously, the layout of the exhaust system is very important. If the layout is improper, it is very easy to cause concrete pipe blockage. At present, due to the influence of many different factors such as the span, diameter, and other related structural forms of the steel tube arch, the design department has not made unified requirements for the layout of the exhaust system. If the exhaust system is not set up properly, it is easy to cause the concrete jacking operation to be interrupted and the density of the concrete in the steel tube arch to fail to meet the standard. Summary of the invention

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method for continuously pumping concrete in the arch rib of a tied arch bridge, which innovates the method of usually only setting an exhaust system on the arch top, and combines the changes in the actual structure of the steel tube arch itself, such as the change in the number of hangers, to arrange the exhaust system in an orderly and simple manner according to the rules of the arrangement method, thereby ensuring that the jacking operation of filling the concrete inside the steel tube arch rib is always in a continuous and uninterrupted state, reducing the risk of interruption of the concrete jacking operation due to improper setting of the exhaust system to a minimum, and ensuring that the density of the concrete in the steel tube arch meets the standards.

[0004] In order to achieve the above object, the present invention provides a method for continuously pumping concrete in the arch rib of a tied arch bridge, characterized in that it comprises the following steps:

[0005] S1: Determine the number and specific locations of the exhaust holes required on the tied arch bridge;

[0006] S2: Prefabricate and assemble the steel tube arch rib assembly and its transverse connecting members of the tied arch bridge in the factory. At the same time, holes are opened on the top middle arch rib segment and the non-embedded arch rib segments on both sides of the steel tube arch rib according to the preset number and specific positions of the exhaust holes, and exhaust pipes are welded at the openings;

[0007] S3: constructing the bored pile foundation, cap, pier body and tie beam of the main structure of the steel tube arch bridge on site, arranging arch rib brackets matching the curvature of the tied arch bridge on the tie beams in sequence, erecting each arch rib segment of the steel tube arch rib assembly on the corresponding arch rib brackets in sections, welding each arch rib segment into a whole, and then separating the arch rib brackets from each arch rib segment;

[0008] S4: Assemble the concrete jacking system and arrange it at the corresponding position of each embedded arch rib segment;

[0009] S5: Send the jacking concrete produced according to the self-compacting concrete mix ratio to the construction site, control all ground pumps to perform jacking operations at the same time, observe the conditions of concrete discharged from each exhaust hole, and if the concrete properties are similar to those at the jacking inlet, close the exhaust hole of the section;

[0010] S6: When the jacking concrete reaches the highest exhaust hole and its properties are consistent with those of the injected concrete, the jacking operation is stopped to achieve continuous pumping of concrete in the steel pipe arch rib of the tied arch bridge.

[0011] Furthermore, the tied arch bridge in step S1 includes a main structure, a steel tube arch rib assembly arranged on the main structure, and a plurality of exhaust hole assemblies arranged on the steel tube arch rib assembly.

[0012] Furthermore, the main structure includes two groups of first bored pile foundations arranged in parallel and at intervals, a cap provided on each group of first bored pile foundations, a pier body provided on each cap, and a tie beam provided between the two pier bodies.

[0013] Furthermore, the steel tube arch rib assembly is a parallel arch, comprising a first steel tube arch rib and a second steel tube arch rib of the same structure which are arranged in parallel and spaced on the tie beam; the first steel tube arch rib and the second steel tube arch rib each comprise a plurality of arch rib segments spliced ​​in sequence;

[0014] The first steel tube arch rib and the second steel tube arch rib each include a middle arch rib segment located at the top, and a plurality of pairs of side arch rib segments symmetrically arranged on both sides of the middle arch rib segment and distributed along the arch shape;

[0015] The lowest one among several pairs of side arch rib segments is a pre-embedded arch rib segment, part of which is pre-embedded in the tie beam;

[0016] A plurality of pairs of hangers are provided on the first steel tube arch rib and the second steel tube arch rib;

[0017] The hangers are arranged in pairs on the longitudinal center axes of the middle arch rib segment and the non-embedded arch rib segments in the plurality of pairs of side arch rib segments;

[0018] The hangers are symmetrically arranged on both sides of the transverse center point of the top of the middle arch rib segment;

[0019] The hangers are arranged in pairs on the longitudinal center axis of the side arch rib segments of each non-embedded arch rib segment;

[0020] The first steel tube arch rib and the second steel tube arch rib are connected by a plurality of transverse connecting members arranged at even intervals.

[0021] Furthermore, each arch rib segment includes two steel pipes arranged vertically, namely an upper arch rib and a lower arch rib; the several exhaust hole assemblies on the steel pipe arch rib assembly include a first exhaust hole arranged on a non-embedded arch rib segment in several pairs of side arch rib segments and a second exhaust hole on the middle arch rib segment of the first steel pipe arch rib or the second steel pipe arch rib.

[0022] Further, the first exhaust holes are respectively arranged on the upper arch rib and the lower arch rib of the non-embedded arch rib segment in the plurality of pairs of side arch rib segments; the first exhaust holes are arranged on the longitudinal center axis of the upper arch rib of the non-embedded arch rib segment in the plurality of pairs of side arch rib segments, and are located above the center points of the two paired suspension rods;

[0023] The first exhaust holes are symmetrically arranged on both sides of the longitudinal center axis of the lower arch rib of the non-embedded arch rib segment in the side arch rib segment, and the opening center radial of the first exhaust hole forms an angle of 45° with the transverse center line of the arch rib.

[0024] Furthermore, the second exhaust holes are respectively arranged on the upper arch rib and the lower arch rib of the middle arch rib segment; when the second exhaust holes are arranged on the upper arch rib of the middle arch rib segment, they are set on the longitudinal center axis of the arch rib segment, and are symmetrically arranged along the transverse center axis of the arch rib segment; when the second exhaust holes are arranged on the lower arch rib of the middle arch rib segment, in order to avoid the web between the upper and lower arch ribs, they are set on the side deviating from the longitudinal center line of the arch rib segment, and are symmetrically arranged on both sides of the transverse center line of the arch rib segment.

[0025] Furthermore, the concrete jacking system in step S4 includes a ground pump, a pumping concrete inlet pipe provided on the embedded arch rib of the tied arch bridge, and a pumping concrete pipeline provided between the ground pump and the pumping concrete inlet pipe.

[0026] Furthermore, the exhaust hole in step S5 is sealed by directly plugging it with bolts.

[0027] Furthermore, in step S6, the exhaust hole is sealed by filling the exhaust pipe with concrete, and when the concrete strength reaches the requirement, the exhaust pipe and the concrete in the pipe are removed.

[0028] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0029] (1) The method for continuously pumping concrete in the arch ribs of a tied arch bridge of the present invention comprises providing a first exhaust hole on a non-embedded arch rib segment in a plurality of pairs of side arch rib segments of a steel tube arch rib arranged in parallel and at intervals, and providing a second exhaust hole on a middle arch rib segment; such distribution can ensure that air can be discharged from multiple directions during concrete pouring, thereby improving exhaust efficiency; the first exhaust hole is arranged on the longitudinal center axis of the upper arch rib of the non-embedded arch rib segment in the plurality of pairs of side arch rib segments, and is located above the center points of the two paired hangers; the first exhaust hole is symmetrically arranged on both sides of the longitudinal center axis of the lower arch rib of the non-embedded arch rib segment in the side arch rib segment, and the radial direction of the center of the opening is at an angle of 45° to the transverse center line of the arch rib, and such design helps to optimize the air flow path and improve exhaust efficiency; the second exhaust hole is arranged on the upper arch rib of the middle arch rib segment, and ... When the second exhaust hole is arranged on the lower arch rib of the middle arch rib segment, it is set on the longitudinal center axis of the arch rib segment and symmetrically arranged along the transverse center axis of the arch rib segment. This precise position design is conducive to achieving better air exhaust during concrete pouring, and the symmetry and uniformity are conducive to ensuring the uniformity of concrete pouring and the stability of the structure; when the second exhaust hole is arranged on the lower arch rib of the middle arch rib segment, in order to avoid the web between the upper and lower arch ribs, it is set on the side deviating from the longitudinal center line of the arch rib segment, and is symmetrically arranged on both sides of the transverse center line of the arch rib segment; the arrangement of the exhaust holes can be adjusted according to the specific arch rib structure and construction requirements, and has strong adaptability and flexibility; by optimizing the arrangement of the exhaust holes, bubbles and voids in the concrete pouring process can be reduced, the exhaust efficiency of concrete pouring can be improved, and the density of concrete, construction safety and construction quality can be improved.

[0030] (2) The method of continuously pumping concrete in the arch rib of a tied arch bridge of the present invention connects concrete jacking systems connected to exhaust pipes to four pre-buried arch rib segments respectively, and all concrete jacking systems are jacked synchronously to accurately control the pumping and exhaust of concrete, thereby ensuring continuous pouring of concrete filled in the steel arch rib during the jacking operation, thereby ensuring the uniformity and density of concrete in the arch rib, avoiding defects such as insufficient concrete density and segregation, and improving the construction quality.

[0031] (3) Compared with the prior art, the method of continuously pumping concrete inside the arch rib of a tied arch bridge of the present invention has explored a new arrangement method by innovating the arrangement position of the exhaust holes. At the same time, it is also convenient for on-site technicians to easily master the rules of exhaust hole arrangement based on simple principles and the actual structure of the steel tube arch. According to this arrangement rule and method, the problem of the failure of continuous concrete pouring due to improper exhaust during the jacking operation of filling the steel arch rib of the existing large-span steel tube arch bridge with concrete inside can be completely solved, and the on-site jacking operation can be ensured to be uninterrupted, thereby ensuring the integrity of the steel tube arch rib and the concrete inside it. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic flow chart of a method for continuously pumping concrete into an arch rib of a tied arch bridge according to an embodiment of the present invention;

[0033] Figure 2 It is a schematic diagram of the side structure of a tied arch bridge in a method for continuously pumping concrete in an arch rib of a tied arch bridge according to an embodiment of the present invention;

[0034] Figure 3 It is an enlarged structural schematic diagram of the arrangement position of the exhaust holes on the side arch rib segment of the tied arch bridge in a method for continuously pumping concrete in the arch rib of a tied arch bridge according to an embodiment of the present invention;

[0035] Figure 4 It is an enlarged structural schematic diagram of the arrangement position of the exhaust holes on the middle arch rib segment of the tied arch bridge in a method for continuously pumping concrete in the arch rib of a tied arch bridge according to an embodiment of the present invention;

[0036] Figure 5 It is an enlarged structural schematic diagram of a pre-buried arch rib segment and a concrete jacking system of a tied arch bridge in a method for continuously pumping concrete in an arch rib of a tied arch bridge according to an embodiment of the present invention;

[0037] Figure 6 It is a schematic diagram of the structure of a top view of a tied arch bridge in a method for continuously pumping concrete in an arch rib of a tied arch bridge according to an embodiment of the present invention;

[0038] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at C in the middle sample;

[0039] Figure 8 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0040] Fig. 9 for Figure 4 Schematic diagram of the cross-sectional structure of the middle BB;

[0041] Fig.10 for Figure 8 Schematic diagram of the enlarged structure of medium-sized sample D.

[0042] In all the drawings, the same reference numerals represent the same technical features, specifically: 100 - tied arch bridge, 201 - first bored pile foundation, 202 - cap, 203 - pier, 204 - tie beam, 301 - first arch rib, 302 - second arch rib, 303 - third arch rib, 304 - fourth arch rib, 305 - fifth arch rib, 306 - sixth arch rib, 307 - seventh arch rib, 308 - eighth arch rib, 309 - ninth arch rib, 310 - tenth arch rib, 311 - eleventh arch rib, 312 - twelfth arch rib, 313 - thirteenth arch rib, 314 - fourteenth arch rib, 315 - tenth arch rib, 316 - eleventh arch rib, 317 - twelfth arch rib, 318 - thirteenth arch rib, 319 - fourteenth arch rib, 320 - - the fifteenth arch rib, 316- the sixteenth arch rib, 317- the seventeenth arch rib, 318- the eighteenth arch rib, 401- the first steel pipe connection system, 402- the second steel pipe connection system, 403- the third steel pipe connection system, 404- the fourth steel pipe connection system, 405- the fifth steel pipe connection system, 501- the first exhaust hole, 502- the second exhaust hole, 1- Oxford River, 6- the second bored pile foundation, 7- steel pipe column, 8- column top distribution beam, 9- Bailey beam, 10- bottom formwork structure, 11- hanger, 12- arch rib bracket, 13- ground pump, 14- pumping concrete pipeline, 15- pumping concrete inlet pipe. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to", "disposed on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] like Figure 1-Figure 10 As shown, one aspect of the present invention provides a method for continuously pumping concrete in an arch rib of a tied arch bridge, comprising:

[0047] S1: Determine the number and specific locations of the exhaust holes to be opened according to the design drawings and construction requirements;

[0048] S2: prefabricate and assemble the steel tube arch rib assembly and its transverse connecting member of the tied arch bridge 100 in the factory, and at the same time, make holes on the top middle arch rib segment and the non-embedded arch rib segments on both sides of the steel tube arch rib according to the preset number and specific positions of the exhaust holes, and weld exhaust pipes at the holes to complete the overall layout of the exhaust system of the steel tube arch rib;

[0049] S3: constructing the bored pile foundation 201, the cap 202, the pier 203, and the tie beam 204 of the main structure of the steel tube arch bridge on site, sequentially arranging the arch rib brackets 12 matching the curvature of the tied arch bridge 100 on the tie beam 204, and erecting the arch rib segments of the steel tube arch rib assembly on the corresponding arch rib brackets 12 in sections;

[0050] S4: welding the arch rib segments of the steel pipe arch rib assembly into a whole one by one on the arch rib bracket 12, and then separating the arch rib bracket 12 from the arch rib segments;

[0051] S5: Assemble the concrete lifting system and arrange it at the corresponding position of each embedded arch rib segment; connect the ground pump 13 and the pumping concrete inlet pipe 15 on the embedded arch rib segment through the pumping concrete pipeline 14 to ensure that the concrete lifting operation is carried out symmetrically front and back and left and right;

[0052] S6: The jacking concrete produced according to the self-compacting concrete mix ratio is sent to the construction site, and all the ground pumps 13 are controlled to perform jacking operations at the same time, and the conditions of the concrete discharged from each vent are observed. If the concrete has similar properties to the concrete at the jacking inlet, the vent holes of the section are closed; specifically, the jacking concrete is produced according to the self-compacting concrete mix ratio and sent to the construction site, and all the ground pumps 13 are controlled to perform jacking operations at the same time; after the jacking operation begins, the conditions of the concrete discharged from each vent are observed; once the concrete passes over the vent holes of the corresponding section, the properties of the emitting concrete are observed, and if the concrete has similar properties to the concrete at the jacking inlet, the vent holes of the section can be closed; the closing method can be tightened with bolts; the jacking concrete is self-compacting concrete, and its main performance is expansion of 550-750mm;

[0053] S7: When the jacking concrete reaches the highest exhaust hole and its properties are consistent with those of the injected concrete, the jacking operation is stopped to realize the continuous pumping operation of the concrete in the steel pipe arch rib of the tied arch bridge; specifically, when the jacking concrete reaches the highest exhaust hole, the discharged concrete material is observed, and when its properties are consistent with those of the injected concrete, the jacking operation can be stopped.

[0054] The method of the invention ensures the quality of concrete in the arch rib and the stability of the structure by accurately controlling the pumping and exhausting of concrete.

[0055] Furthermore, in step S1, before construction, the number and specific positions of the exhaust holes to be opened on the steel tube arch ribs need to be determined according to the design and structural characteristics of the tied arch bridge. These exhaust holes will be used to exhaust air when pumping concrete to ensure the uniformity and density of the concrete.

[0056] Furthermore, in step S1, the tied arch bridge 100 spans the Oxford River 1, and the tied arch bridge 100 and the Oxford River have an oblique angle of 38°; the tied arch bridge 100 comprises a main structure, a steel tube arch rib assembly arranged on the main structure, and a plurality of exhaust hole assemblies arranged on the steel tube arch rib assembly; the main structure comprises two groups of first bored pile foundations 201 arranged in parallel and at intervals, a cap 202 arranged on each group of first bored pile foundations 201, a pier body 203 arranged on each cap 202, and a tie beam 204 arranged between the two pier bodies 203; the steel tube arch rib assembly is a parallel arch, comprising a first steel tube arch rib and a second steel tube arch rib of the same structure arranged in parallel and at intervals on the tie beam 204; the first steel tube arch rib and the second steel tube arch rib each comprise a plurality of arch rib segments spliced ​​in sequence; the first steel tube arch rib and the second steel tube arch rib The ribs include a middle arch rib segment at the top and several pairs of side arch rib segments symmetrically arranged on both sides of the middle arch rib segment along the arch shape; the lowest one among the several pairs of side arch rib segments is a pre-embedded arch rib segment, which is partially pre-embedded in the tie beam 204; several pairs of hangers 11 are provided on the first steel tube arch rib and the second steel tube arch rib; the hangers 11 are arranged in pairs on the longitudinal center axes of the non-embedded arch rib segments in the middle arch rib segment and the several pairs of side arch rib segments; the hangers 11 are symmetrically arranged on both sides of the top transverse center point of the middle arch rib segment; the hangers 11 are arranged in pairs on the longitudinal center axis of the side arch rib segments of each non-embedded arch rib segment; an exhaust pipe is fixed on the exhaust hole, and the arrangement of the exhaust hole and the exhaust pipe helps to smoothly discharge the air in the steel pipe during the pumping of concrete, reduce bubbles and gaps, and thus improve the density of the concrete.

[0057] Furthermore, the first steel tube arch rib and the second steel tube arch rib are connected by a plurality of transverse connecting members arranged at even intervals; the tie beam 204 is a prestressed reinforced concrete structure; a tie beam support system is provided at the bottom of the tie beam 204, and the tie beam support system includes a plurality of second bored pile foundations 6 evenly spaced in the mudstone, a steel tube column 7 provided at the top of each of the second bored pile foundations 6, a column top distribution beam 8 provided at the top of each of the steel tube columns 7, a Bailey beam 9 provided at the top of all the column top distribution beams 8, and a The bottom formwork structure 10 is between the Bailey beam 9 and the tie beam 204; the construction load of the tie beam 204 and each arch rib installation is supported by the tie beam support system; when the arch rib of the tied arch bridge 100 is filled with concrete, the bored pile foundation 201, the pedestal 202, the pier body 203, and the tie beam 204 of the main structure have been completed, and the tie beam 204 has been tensioned; the first steel tube arch rib, the second steel tube arch rib and multiple transverse connecting tie members between the arch ribs have been installed; the tie beam support system shall not be dismantled before the arch rib concrete jacking operation and the installation of the hanger 11.

[0058] Furthermore, each rib segment includes two steel pipes arranged vertically, namely, an upper rib and a lower rib. This structure can provide additional stability and bearing capacity. The plurality of exhaust hole assemblies on the steel pipe rib assembly include a first exhaust hole 501 provided on a non-embedded rib segment in a plurality of pairs of side rib segments and a second exhaust hole 502 provided on an intermediate rib segment of the first steel pipe rib or the second steel pipe rib. This distribution can ensure that air can be exhausted from multiple directions during concrete pouring, thereby improving exhaust efficiency. The first exhaust hole The holes 501 are arranged respectively on the upper arch rib and the lower arch rib of the non-embedded arch rib segment in several pairs of side arch rib segments; specifically, the first exhaust hole 501 is arranged on the longitudinal center axis of the upper arch rib of the non-embedded arch rib segment in several pairs of side arch rib segments, and is located above the center point of the two pairs of hangers 11; the first exhaust hole 501 is symmetrically arranged on both sides of the longitudinal center axis of the lower arch rib of the non-embedded arch rib segment in the side arch rib segment, and the radial direction of the opening center of the first exhaust hole 501 is parallel to the transverse center of the arch rib. The angle of the line is 45°, and this design helps to optimize the air flow path and improve the exhaust efficiency; the second exhaust hole 502 is arranged on the upper arch rib and the lower arch rib of the middle arch rib segment respectively; when the second exhaust hole 502 is arranged on the upper arch rib of the middle arch rib segment, it is set on the longitudinal center axis of the arch rib segment, and is symmetrically arranged along the transverse center axis of the arch rib segment. This precise position design helps to achieve better air discharge during concrete pouring, and the symmetry and uniformity help to ensure the uniformity of concrete pouring and the stability of the structure; when the second exhaust hole 502 is arranged on the lower arch rib of the middle arch rib segment, in order to avoid the web between the upper and lower arch ribs, it is set on the side deviating from the longitudinal center line of the arch rib segment, and is symmetrically arranged on both sides of the transverse center line of the arch rib segment; the arrangement of the exhaust holes can be adjusted according to the specific arch rib structure and construction requirements, and has strong adaptability and flexibility; by optimizing the arrangement of the exhaust holes, bubbles and voids in the concrete pouring process can be reduced, and the density and construction quality of the concrete can be improved.

[0059] Further, in a specific embodiment of the present invention, five transverse connection system components are arranged between the first steel tube arch rib and the second steel tube arch rib, which are the first steel tube connection system 401, the second steel tube connection system 402, the third steel tube connection system 403, the fourth steel tube connection system 404, and the fifth steel tube connection system 405 from left to right; the first steel tube arch rib includes the first arch rib 301, the second arch rib 302, the third arch rib 303, the fourth arch rib 304, the fifth arch rib 305, the sixth arch rib 306, the seventh arch rib 307, the eighth arch rib 308, the ninth arch rib 309, the ninth arch rib 310, the ninth arch rib 311, the ninth arch rib 312, the ninth arch rib 313, the ninth arch rib 314, the ninth arch rib 315, the ninth arch rib 316, the ninth arch rib 317, the ninth arch rib 318, the ninth arch rib 319, the first arch rib 310, the first arch rib 311, the second arch rib 312, the third arch rib 313, the fourth arch rib 314, the fifth arch rib 315, the sixth arch rib 316, the seventh arch rib 317, the eighth arch rib 318, the ninth arch rib 319, the ninth arch rib 311, the first arch rib 09; the first arch rib 301 and the ninth arch rib 309 are located at the two lowest ends of the steel tube arch bridge, and are partially embedded in the tie beam 204; the fifth arch rib 305 is located at the top of the steel tube arch bridge; the second arch rib 302 and the eighth arch rib 308, the third arch rib 303 and the seventh arch rib 307, the fourth arch rib 304 and the sixth arch rib 306 are symmetrically arranged on both sides of the fifth arch rib 305; the second steel tube arch rib includes the tenth arch rib 310, the eleventh arch rib 311, the twelfth arch rib 312, the thirteenth arch rib 313, the fourteenth arch rib 314, the fifteenth arch rib 315, which are sequentially spliced ​​in an arch shape from left to right 315, the sixteenth arch rib 316, the seventeenth arch rib 317, and the eighteenth arch rib 318; the tenth arch rib 310 and the eighteenth arch rib 318 are located at the two lowest ends of the steel tube arch bridge, and are partially embedded in the tie beam 204; the fourteenth arch rib 314 is located at the top of the steel tube arch bridge; the eleventh arch rib 311 and the seventeenth arch rib 317, the twelfth arch rib 312 and the sixteenth arch rib 316, the thirteenth arch rib 313 and the fifteenth arch rib 315 are symmetrically arranged on both sides of the fourteenth arch rib 314; the first arch rib 301 to the ninth arch rib 309 and the tenth arch rib 310 to the eighteenth arch rib 31 8 have the same structure and corresponding positions; the arch ribs on both sides of the tie arch bridge 100 are manufactured in 2*9 sections (the first arch rib 301 to the ninth arch rib 309 and the tenth arch rib 310 to the eighteenth arch rib 318), wherein 2*2 arch foot segments (the first arch rib 301 and the ninth arch rib 309, the tenth arch rib 310 and the eighteenth arch rib 318) are pre-buried when the tie beam 204 is cast in situ, and the other 2*7 segments (the second arch rib 302 to the eighth arch rib 308, the eleventh arch rib 311 to the seventeenth arch rib 317) are installed section by section on the ground by a car crane and closed in the middle of the span; the 5 components of the transverse connection system are installed in 5 times.

[0060] Further, in a specific embodiment of the present invention, the exhaust holes are respectively arranged at 40 positions on the corresponding positions of the first steel tube arch rib and the second steel tube arch rib; the exhaust hole distribution of the first steel tube arch rib or the second steel tube arch rib includes two forms: the first form, such as Figure 2 , Figure 3 , Figure 8As shown, the first exhaust hole 501 is arranged on the first steel tube arch rib on the longitudinal center line of the upper arch rib top of the second arch rib 302, the third arch rib 303, the fourth arch rib 304, the sixth arch rib 306, the seventh arch rib 307, and the eighth arch rib 308, and is respectively arranged above the center line of each pair of suspension rods 11 at a position 800 mm away from the center point of the suspension rod, and a Φ32 mm hole is directly opened on the steel tube at this position; the first exhaust hole 501 is arranged on the second arch rib 302, the third arch rib 303, the fourth arch rib 304, the sixth arch rib 306, the seventh arch rib 307, and the eighth arch rib 308. The rib 306, the seventh arch rib 307, and the eighth arch rib 308 are located on the lower arch rib on the longitudinal center line of the lower arch rib, and the opening center radial of the first exhaust hole 501 is at an angle of 45° with the transverse center line of the lower arch rib, and are symmetrically arranged at a horizontal distance of 389 mm on both sides of the transverse center line of the lower arch rib; the first exhaust hole 501 is arranged at a position corresponding to the position on the first steel tube arch rib on the second steel tube arch rib; the first exhaust hole 501 is subtotally 36 on one side of the single-side arch rib (the first steel tube arch rib or the second steel tube arch rib); the second type, such as Figure 2 , Figure 4 , Fig. 9 As shown, when the second exhaust hole 502 is set on the upper arch rib of the first steel tube arch rib, it is set on the arch top of the fifth arch rib 305, located on the longitudinal center line of the arch, 850mm away from the transverse center line, symmetrically arranged on the transverse center line, with a total of 2, and the upper exhaust pipe is welded with a φ200*8mm steel pipe with a height of 1000mm; when the second exhaust hole 502 is set on the lower arch rib of the first steel tube arch rib, the exhaust hole φ200*8mm steel pipe is arranged 440mm on one side of the longitudinal center line of the lower arch rib to avoid the web between the upper and lower arch ribs, and is symmetrically arranged 850mm on both sides of the transverse center line, with a length of 1000mm, and a total of 2.

[0061] Furthermore, the concrete jacking system in step S4 includes a ground pump 13, a pumping concrete inlet pipe 15 provided on the embedded arch rib of the tied arch bridge 100, and a pumping concrete pipeline 14 provided between the ground pump 13 and the pumping concrete inlet pipe 15; two pumping concrete inlet pipes 15 are provided on each embedded arch rib, and a total of eight pumping concrete inlet pipes 15 are provided in the entire tied arch bridge 100, which are arranged symmetrically on the left and right.

[0062] Furthermore, in step S6, the first exhaust hole 501 can be sealed by directly plugging it with a φ32 bolt. Figure 8 and Fig.10 As shown; in step S7, the second exhaust hole 502 is closed by filling the exhaust pipe with concrete, and when the concrete strength reaches the requirement, the exhaust pipe and the concrete in the pipe can be removed.

[0063] The present invention aims at the construction process requirements of pumping concrete in the steel tube arch rib of the tied arch bridge. On the basis of the traditional exhaust hole design, the arrangement of the exhaust holes is innovated. Combined with the process measures of self-compacting concrete, the problem of continuous pumping of concrete in the arch rib can be completely solved, and the one-time jacking of the concrete in the arch rib can be ensured to be successful, thereby reducing the risk of the concrete filling in the arch rib not being able to be continuously poured to the minimum, effectively ensuring the continuity and integrity of the concrete filling inside the steel tube arch rib, so that it meets the design requirements, and finally ensuring the structural safety of the tied arch bridge. Through the innovation of the arrangement position of the exhaust holes on the tied arch bridge, a new arrangement method is explored, and it is also convenient for on-site technicians to easily master the rules of exhaust hole arrangement based on simple principles and combined with the actual structure of the steel tube arch. According to the rules and methods of this arrangement, the problem that the concrete filling inside the steel arch rib of the existing large-span steel tube arch bridge cannot be continuously poured during the jacking operation is completely solved, ensuring that the on-site jacking operation is not interrupted, and ensuring the integrity of the steel tube arch rib and the concrete inside it.

[0064] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for continuously pumping concrete in the arch rib of a tied arch bridge, characterized in that: The steps include: S1: Determine the number and specific positions of the exhaust holes that need to be opened on the tied arch bridge (100); S2: prefabricating and assembling the steel tube arch rib assembly and the transverse connecting member of the tied arch bridge (100) in a factory, and at the same time, drilling holes according to the preset number and specific positions of exhaust holes on the top middle arch rib segment and the non-embedded arch rib segments on both sides of the steel tube arch rib, and welding exhaust pipes at the holes; S3: constructing the bored pile foundation (201), the cap (202), the pier body (203), and the tie beam (204) of the main structure of the steel tube arch bridge on site, sequentially arranging the arch rib brackets (12) matching the curvature of the tied arch bridge (100) on the tie beam (204), erecting the arch rib segments of the steel tube arch rib assembly on the corresponding arch rib brackets (12) in sections, welding the arch rib segments into a whole, and then separating the arch rib brackets (12) from the arch rib segments; S4: Assemble the concrete jacking system and arrange it at the corresponding position of each embedded arch rib segment; S5: sending the jacking concrete produced according to the self-compacting concrete mix ratio to the construction site, controlling all ground pumps (13) to perform jacking operations simultaneously, observing the state of concrete discharged from each exhaust hole, and if the concrete properties are similar to those of the jacking inlet, closing the exhaust hole of the section; S6: When the jacking concrete reaches the highest exhaust hole and its properties are consistent with those of the injected concrete, the jacking operation is stopped to achieve continuous pumping of concrete in the steel pipe arch rib of the tied arch bridge.

2. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 1, characterized in that: The tied arch bridge (100) in step S1 comprises a main structure, a steel tube arch rib assembly arranged on the main structure, and a plurality of exhaust hole assemblies arranged on the steel tube arch rib assembly.

3. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 2, characterized in that: The main structure comprises two groups of first bored pile foundations (201) arranged in parallel and at intervals, a cap (202) provided on each group of first bored pile foundations (201), a pier body (203) provided on each cap (202), and a tie beam (204) provided between the two pier bodies (203).

4. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 3, characterized in that: The steel tube arch rib assembly is a parallel arch, comprising a first steel tube arch rib and a second steel tube arch rib of the same structure which are arranged in parallel and spaced apart on the tie beam (204); the first steel tube arch rib and the second steel tube arch rib both comprise a plurality of arch rib segments which are spliced ​​in sequence; The first steel tube arch rib and the second steel tube arch rib each include a middle arch rib segment located at the top, and a plurality of pairs of side arch rib segments symmetrically arranged on both sides of the middle arch rib segment and distributed along the arch shape; The lowest one of the pairs of side arch rib segments is a pre-embedded arch rib segment, which is partially pre-embedded in the tie beam (204); A plurality of pairs of suspension rods (11) are provided on the first steel tube arch rib and the second steel tube arch rib; The suspension rods (11) are arranged in pairs on the longitudinal center axes of the middle arch rib segment and the non-embedded arch rib segments in the plurality of pairs of side arch rib segments; The suspension rods (11) are symmetrically arranged on both sides of the transverse center point of the top of the middle arch rib segment; The hangers (11) are arranged in pairs on the longitudinal center axis of the side arch rib segment of each non-embedded arch rib segment; The first steel tube arch rib and the second steel tube arch rib are connected by a plurality of transverse connecting members arranged at even intervals.

5. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 4, characterized in that: Each rib segment comprises two steel pipes arranged vertically, namely an upper rib and a lower rib; the plurality of exhaust hole assemblies on the steel pipe rib assembly comprise a first exhaust hole (501) arranged on a non-embedded rib segment in a plurality of pairs of side rib segments and a second exhaust hole (502) on an intermediate rib segment of the first steel pipe rib or the second steel pipe rib.

6. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 5, characterized in that: The first exhaust holes (501) are respectively arranged on the upper ribs and the lower ribs of the non-embedded rib segments in the plurality of pairs of side rib segments; the first exhaust holes (501) are arranged on the longitudinal center axis of the upper ribs of the non-embedded rib segments in the plurality of pairs of side rib segments, and are located above the center points of the two paired suspension rods (11); The first exhaust holes (501) are symmetrically arranged on both sides of the longitudinal center axis of the lower arch rib of the non-embedded arch rib segment in the side arch rib segment, and the opening center radial of the first exhaust hole (501) forms an angle of 45° with the transverse center line of the arch rib.

7. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 5, characterized in that: The second exhaust holes (502) are arranged on the upper arch rib and the lower arch rib of the middle arch rib segment respectively; when the second exhaust holes (502) are arranged on the upper arch rib of the middle arch rib segment, they are arranged on the longitudinal center axis of the arch rib segment and are symmetrically arranged along the transverse center axis of the arch rib segment; when the second exhaust holes (502) are arranged on the lower arch rib of the middle arch rib segment, in order to avoid the web between the upper and lower arch ribs, they are set on the side deviating from the longitudinal center line of the arch rib segment and are symmetrically arranged on both sides of the transverse center line of the arch rib segment.

8. A method for continuously pumping concrete in the arch rib of a tied arch bridge according to any one of claims 1 to 7, characterized in that: The concrete jacking system in step S4 comprises a ground pump (13), a pumping concrete inlet pipe (15) arranged on the embedded arch rib of the tied arch bridge (100), and a pumping concrete pipeline (14) arranged between the ground pump (13) and the pumping concrete inlet pipe (15).

9. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 1, characterized in that: The vent hole in step S5 is sealed by directly plugging it with bolts.

10. The method for continuously pumping concrete in the arch rib of a tied arch bridge according to claim 1, characterized in that: In step S6, the exhaust hole is sealed by filling the exhaust pipe with concrete, and when the concrete strength reaches the requirement, the exhaust pipe and the concrete in the pipe are removed.

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