CN111979926A - Method for pouring concrete in pipe of long-span concrete-filled steel pipe arch bridge in plateau alpine region - Google Patents
Method for pouring concrete in pipe of long-span concrete-filled steel pipe arch bridge in plateau alpine region Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 210
- 239000010959 steel Substances 0.000 title claims abstract description 210
- 239000004567 concrete Substances 0.000 title claims abstract description 197
- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000005192 partition Methods 0.000 claims abstract description 43
- 230000010412 perfusion Effects 0.000 claims 4
- 238000001802 infusion Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 68
- 238000005452 bending Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
Abstract
The invention discloses a concrete pouring method in a large-span steel pipe concrete arch bridge pipe in a plateau alpine region, wherein for a lower chord steel pipe, the lower chord steel pipe is divided into a lower chord upper bin and a lower chord lower bin by a lower chord partition, the lower chord partition is arranged in a region (counted from an arch springing) at the position of 1/3 parts of the full arch length, the lower chord upper bin is poured with concrete firstly, and then the lower chord lower bin is poured. The difficulty and risk of the double-track railway steel pipe concrete arch bridge in the plateau alpine region reaching more than 500m are reduced, the feasibility is greatly improved, the construction cost is hardly increased, the method is a steel pipe concrete arch bridge pouring construction method worthy of being popularized in the plateau alpine region, and the method is also suitable for the construction of the large-span steel pipe concrete arch bridge in the conventional environment region with high requirements on construction period.
Description
Technical Field
The invention relates to the field of steel pipe concrete arch bridges, in particular to a method for pouring concrete in a large-span steel pipe concrete arch bridge in a plateau alpine region.
Background
The steel pipe concrete arch bridge is characterized by that the concrete is poured into the steel pipe as main stress member, and the advantages of concrete compression resistance and steel tension resistance are comprehensively utilized, and at the same time the two problems of high reinforcement of arch bridge material and light arch ring weight are solved. Engineering practice proves that compared with a steel structure, the steel tube concrete can save steel consumption by 50% and reduce welding workload under the condition of keeping the same bearing capacity. From 90 s in the 20 th century to the present, various concrete-filled steel tube arch bridges constructed in China exceed 400 seats, wherein more than 40 seats with a span of more than 200m and more than 10 seats with a span of more than 300m are built in China, the Guangxi Pinnan three-bridge is the largest-span concrete-filled steel tube arch bridge in the world at present, the calculated span of a main span is 560m, the diameter of a steel tube is 1.4m, and the concrete pouring amount in the tube of a single steel tube is 950m3。
As is well known, concrete materials are good in compression resistance and tensile resistance, and the concrete which is early in age but does not reach the designed strength almost has no tensile capability. The common pouring methods of the concrete-filled steel tube arch bridge mainly comprise a high-position throwing non-vibration pouring method, an arch foot-arch crown section-by-section bin-by-bin pouring method, an arch foot-arch crown symmetrical continuous pumping jacking method and the like.
The high-position throwing and non-vibrating pouring method is basically eliminated at present because concrete is easy to form cavities and debond.
The arch springing to vault section by section bin-by-section filling method is long in construction period, the steel pipe is divided into more than 2 time periods for filling by arranging the bin separating plates in the steel pipe, and in order to avoid early concrete from tensile cracking, the method needs to wait for an age period of about at least 4 days after filling of one bin section, and is less in use at present due to overlong construction period.
The most common method is springing to vault symmetric continuous pumping jacking. The method is characterized in that after the arch rib is erected, concrete is continuously poured from an arch foot to an arch crown by adopting a pumping jacking mode, the concrete is symmetrically and continuously relayed and pumped according to the design grading and pouring sequence (as shown in figure 1) along the direction from the arch foot to the arch crown, the 1 st, the 2 nd and the 3 rd sections are sequentially relayed and jacked, and in order to avoid early-stage concrete from being cracked under tension, the key for successfully implementing the method is as follows: firstly, all the concrete in the same steel pipe needs to be poured before the initial poured concrete in the pipe reaches the final set time, otherwise, the initial poured concrete has very low strength when just reaching the final set, and the later poured concrete causes the deformation of the steel pipe to cause the tensile cracking of the initial poured concrete, thereby influencing the quality of the concrete in the pipe and further influencing the safety performance of the concrete; secondly, the pouring time difference of the adjacent two stages of concrete cannot exceed the fluidity maintaining time of the concrete, otherwise, the concrete cannot be pumped to cause pipe blockage after losing fluidity. The method is suitable for the concrete with the maximum pouring amount of 1000m of single steel tube concrete due to the limitations of mechanical equipment, concrete fluidity, initial setting and final setting time of the concrete3Left and right.
With the rapid development of railway construction in China, particularly in the construction of railways in alpine regions in plateaus, a large-span arch bridge is needed to span mountainous canyon terrains. Because the live load value of the double-track railway far exceeds the live load value of the highway, when the span of the railway concrete-filled steel tube arch bridge exceeds 500m grade, the maximum diameter of a steel tube required to be adopted by the design is about 2.1m, and the maximum concrete pouring amount in a single tube exceeds 1600m3In plateau alpine regions, because of the reduction of mechanical efficiency, the maximum filling amount of 50m per hour is determined by the limit capacity of the existing equipment3The time required for continuous pouring was 32 hours, calculated for concrete. And for C60 and aboveThe ultimate setting time of the high-strength concrete is generally only about 25 hours, so the concrete pouring amount in a single pipe exceeds 1600m3The arch bridge adopts a symmetrical continuous pumping jacking method from arch springing to arch crown, which is not applicable.
If the traditional separated-bin pouring method is adopted, two sides of each steel pipe are averagely separated into two bin sections, and 16 bin sections are total. In order to avoid tensile cracking of the concrete due to the fact that the concrete does not reach the strength, after the pouring of each bin is completed, the next bin needs to be poured after the age of the concrete is more than 4 days. For a concrete filled steel tubular arch bridge with 8 chords, the time for the full bridge to be filled with concrete is at least 8 x 2 x 4=64 days. The reason why 8 steel pipes cannot be poured simultaneously is that firstly, the supply capacity of a concrete mixing plant is limited, if 8 steel pipes are poured simultaneously, mixing plants need to be added, the cost of the mixing plants is increased by 3 times (increased by 5000 ten thousand), secondly, most of arch bridges are built in v-shaped canyons, the site conditions of the site are limited, if 8 steel pipes need to be poured simultaneously, the site cost is increased by multiple times, in addition, pumping equipment needs to be increased by 3 times (increased by 6300 ten thousand), in a plateau area, the equipment is difficult to obtain, the equipment needs to be transported from a plain area, the equipment purchase and transportation cost is increased by multiple times, and finally, constructors need to be added, the site is changed from original 60 persons to 240 persons for simultaneous operation, and the problem of construction interference exists because the working face is limited. Therefore, simultaneous pouring of 8 steel pipes is not feasible.
In plain areas, the construction time is not limited by the air temperature environment, the steel pipe concrete arch bridge with 8 chords is poured into the bins one by one, and the pouring method which takes 64 days is also feasible. However, in alpine regions in plateau areas, the lowest air temperature of some bridge positions is higher than zero within about 45 days of a year, namely the time period between the middle and last ten days of 7 months to 8 months, the construction is suitable for concrete pouring, when the air temperature is lower than zero, cold-proof heat preservation measures are required for construction (the defect is that the measure cost is high), the poured concrete is prevented from being frozen and cracked, if the cold-proof heat preservation measures are not adopted, concrete pouring is required to be carried out on steel pipes which are not poured at intervals of one year, the labor and machine cost is increased, the construction period is increased by one year, the construction risk is increased, and the further development of railway arch bridges with the span exceeding 500m in the alpine regions in plateau areas is limited.
Therefore, for the railway steel tube concrete arch bridge with the span exceeding 500m grade in the plateau alpine region, a new in-tube concrete pouring method needs to be researched.
Disclosure of Invention
The invention aims to: aiming at the problem that three pouring methods (a high-position throwing non-vibration pouring method, an arch springing to vault section by section split pouring method and an arch springing to vault symmetrical continuous pumping jacking method) of the existing concrete-filled steel tube arch bridge in the prior art are not suitable for the construction of the steel-filled steel tube concrete arch bridge of the railway with the span exceeding 500m level in the plateau and high cold region, the method for pouring the concrete in the steel-filled steel tube concrete arch bridge in the large span in the plateau and high cold region is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a concrete pouring method in a large-span steel pipe concrete arch bridge pipe in a plateau alpine region is characterized in that for a lower chord steel pipe, the lower chord steel pipe is divided into a lower chord upper bin and a lower chord lower bin by a lower chord partition, the lower chord partition is arranged in a full-arch length 1/3 position area (from arch springing), the lower chord upper bin is poured with concrete firstly, and then the lower chord lower bin is poured.
The mechanical principle of the pouring method is that when the lower chord lower bin concrete is poured, the upper part of the full-bridge arch ring is about 1/3 in length to generate a hogging moment, the hogging moment enables the lower chord steel pipe of the arch ring with 1/3 length to be pressed, and the corresponding upper chord steel pipe is pulled, so that the lower chord upper bin concrete poured firstly is in a pressed state.
By adopting the method for pouring the concrete in the pipe of the large-span concrete-filled steel tube arch bridge in the alpine region in the plateau, the concrete in the lower chord upper bin is poured firstly, so that when the concrete in the lower chord lower bin is poured subsequently, the concrete in the lower chord upper bin is in a compressed state, and tensile stress does not occur; therefore, under the condition of ensuring the quality of concrete, the pouring sequence allows the lower chord upper bin concrete to be aged for only about 1 day (the concrete is subjected to final setting), and the lower chord lower bin concrete can be poured subsequently, so that the waiting time which is more than 4 days and is necessary in the traditional construction method is saved, the construction time is greatly saved, and the method can adapt to the characteristic of short construction window period of the large-span steel pipe concrete arch bridge in the plateau alpine region; the pouring method is novel in form, simple in construction, excellent in effect, very suitable for popularization and also suitable for construction of the large-span steel pipe concrete arch bridge with high requirements for construction period in the conventional environment area.
Preferably, for the upper chord steel pipe, the upper chord steel pipe is divided into an upper chord upper bin, an upper chord middle bin and an upper chord lower bin by an upper chord partition, the upper chord partition between the upper chord upper bin and the upper chord middle bin is arranged in a full arch length 1/3 position area (from the arch springing), the upper chord partition between the upper chord middle bin and the upper chord lower bin is arranged in a full arch length 1/6 position area (from the arch springing), the upper chord lower bin is firstly filled with concrete, then the upper chord upper bin is filled, and finally the upper chord middle bin is filled.
The mechanical principle of the pouring method is that when the upper chord upper bin concrete is poured, positive bending moment is generated in the length range from two side arch feet of the full-bridge arch ring to about 1/6 length of the mid-span, the positive bending moment enables the upper chord steel pipe of the 1/6 length arch ring to be pressed, the corresponding lower chord steel pipe is pulled, and therefore the upper chord lower bin concrete poured in advance is pressed.
By adopting the concrete pouring method in the pipe of the large-span concrete-filled steel tube arch bridge in the alpine region of the plateau, the concrete of the upper chord lower bin is poured firstly, then the concrete of the upper chord upper bin is poured, and finally the concrete of the upper chord middle bin is poured, the concrete of the upper chord upper bin and the concrete of the upper chord middle bin can be continuously poured in one day, so that the concrete of the upper chord lower bin can be in a stressed state and tensile stress does not occur when the concrete of the upper chord upper bin and the upper chord middle bin is poured; therefore, under the condition of ensuring the quality of concrete, the pouring sequence allows the concrete of the upper-chord lower bin to be aged for only about 1 day (the concrete has been subjected to final setting), and the concrete of the upper-chord upper bin and the concrete of the upper-chord middle bin can be poured in one day (the concrete amount is poured in one day), so that the construction time is saved; the pouring method is novel in form, simple in construction, excellent in effect, very suitable for popularization and also suitable for construction of the large-span steel pipe concrete arch bridge with high requirements for construction period in the conventional environment area.
Based on the above, by adopting the method for pouring concrete in the pipe of the large-span concrete-filled pipe arch bridge in the alpine region on the plateau, different bin separation modes and pouring sequences are respectively adopted for the lower chord steel pipe and the upper chord steel pipe, so that a novel bin separation sequence-adjusting loading pouring method for the large-span concrete-filled pipe arch bridge is formed, when concrete of a subsequent bin is poured, the concrete of the previously poured bin is in a compressed state, the early concrete is prevented from being cracked due to tension, the construction quality of the concrete is not influenced even if the final setting time is over and the strength is not high, the problem of time control in the 4-day age is solved, and the problem cannot be solved by the traditional bin separation and pouring sequences; the method can only increase the pouring time of one day for each steel pipe, namely the construction period of each steel pipe is changed into 5 days, for the steel pipe concrete arch bridge with 8 chords, the full-bridge 8 steel pipes are changed into 5 multiplied by 8=40 days, the construction can be finished within the window time of 45 days, and the traditional method needs 64 days.
Further preferably, the lower chord partition is a lower chord partition panel.
Further preferably, the upper chord partition is an upper chord partition panel.
Further preferably, for the same steel pipe truss piece of the arch rib, the lower chord steel pipe is poured first, and then the upper chord steel pipe is poured.
Further preferably, for the plurality of truss arch ribs, the steel pipe truss sheets on the inner side of the arch ring are poured firstly, and then the steel pipe truss sheets on the outer side of the arch ring are poured.
Preferably, the precise position of the upper chord partition between the upper chord upper bin and the upper chord middle bin in the position area of the full arch length 1/3 is determined according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full bridge steel pipe;
and determining the precise position of the upper chord partition arranged between the upper chord middle bin and the upper chord lower bin in the position area of the full arch length 1/6 according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full bridge steel pipe.
Further preferably, the precise position of the upper chord partition arrangement between the upper chord upper bin and the upper chord middle bin is calculated according to finite elements;
and calculating the accurate position of the upper chord partition between the upper chord middle bin and the upper chord lower bin according to the finite element.
Preferably, the precise position of the lower chord partition arranged in the position area of the full arch length 1/3 is determined according to the wall thickness of the lower chord steel pipe and/or the rigidity of the full bridge steel pipe.
Further preferably, the precise location of the lower chord interval arrangement is calculated according to finite elements.
Preferably, the steel pipe arch rib is assembled by adopting a cable hoisting method.
Preferably, the cable hoisting devices are arranged on two banks, the arch rib segments are hoisted, meanwhile, the buckling cables of the arch ribs are tensioned, and the steel pipe arch ribs are assembled section by section from the arch springing until the steel pipe arch ribs are closed.
The invention also provides an upper chord steel tube of the large-span concrete-filled steel tube arch bridge, which comprises an upper chord upper bin, an upper chord middle bin and an upper chord lower bin, wherein an upper chord partition is arranged between the upper chord middle bin and the upper chord lower bin and is arranged in a region (counted from an arch springing) at the position 1/6 of the full arch length, an upper chord partition is arranged between the upper chord upper bin and the upper chord middle bin and is arranged in a region (counted from the arch springing) at the position 1/3 of the full arch length, and the upper chord steel tube is subjected to concrete pouring by adopting the pouring method.
When the upper chord upper bin concrete is poured, positive bending moment is generated in the length range from two side arch feet to about 1/6 of the midspan of the full-bridge arch ring, the positive bending moment enables the upper chord steel pipe of the arch ring with the length of 1/6 to be pressed, and the corresponding lower chord steel pipe is pulled, so that the upper chord lower bin concrete poured in advance is pressed, and tensile stress does not occur; therefore, under the condition of ensuring the quality of concrete, the upper chord steel pipe allows the upper chord lower bin concrete to be aged for only about 1 day (the concrete is subjected to final setting), and the upper chord upper bin and the upper chord middle bin concrete can be poured in one day (the concrete amount is poured in one day), so that the construction time is saved; the upper chord steel pipe is novel in form, simple in construction, excellent in effect and very suitable for popularization, is suitable for construction of a large-span steel pipe concrete arch bridge in a highland and alpine region with a short construction window period, and is also suitable for construction of a large-span steel pipe concrete arch bridge with high requirement on a construction period in a conventional environment region.
The invention also provides a large-span steel pipe concrete arch bridge lower chord steel pipe which comprises a lower chord upper bin and a lower chord lower bin, wherein a lower chord partition is arranged between the lower chord upper bin and the lower chord lower bin, the lower chord partition is arranged in a full-arch length 1/3 position area (from the arch springing), and the lower chord steel pipe is subjected to concrete pouring by adopting the pouring method.
When the lower chord steel tube of the large-span steel tube concrete arch bridge is used for pouring the lower chord lower bin concrete, the upper part of the full-bridge arch ring is about 1/3 in length to generate a negative bending moment, the negative bending moment enables the lower chord steel tube of the arch ring 1/3 in length to be pressed, and the corresponding upper chord steel tube is pulled, so that the lower chord upper bin concrete poured in advance is in a pressed state, and tensile stress does not occur; therefore, under the condition of ensuring the quality of concrete, the lower chord steel pipe allows the lower chord upper bin concrete to be aged for only about 1 day (the concrete is subjected to final setting), and the lower chord lower bin concrete can be poured subsequently, so that the waiting time which is more than 4 days and is necessary in the traditional construction method is saved, the construction time is greatly saved, and the characteristic of short construction window period of the large-span steel pipe concrete arch bridge in the plateau alpine region can be adapted; the lower chord steel pipe is novel in form, simple in construction, excellent in effect and very suitable for popularization, and is also suitable for construction of large-span steel pipe concrete arch bridges with high requirements for construction periods in conventional environmental areas.
The invention also provides a large-span concrete-filled steel tube arch bridge constructed by adopting the pouring method.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the method for pouring concrete in the pipe of the large-span concrete-filled pipe arch bridge in the alpine region in the plateau, different bin dividing modes and pouring sequences are respectively adopted for the lower chord steel pipe and the upper chord steel pipe, so that a novel bin dividing sequence adjusting loading pouring method for the large-span concrete-filled pipe arch bridge is formed, when concrete of a subsequent bin is poured, the concrete of the previously poured bin is in a compressed state, the early-stage concrete is prevented from being cracked due to tension, the construction quality of the concrete is not influenced even if the final setting time is over and the strength is not high, the problem of time control in the 4-day age is solved, and the problem cannot be solved by the traditional bin dividing and pouring sequences; the method can only increase the pouring time of one day for each steel pipe, namely the construction period of each steel pipe is changed into 5 days, for the steel pipe concrete arch bridge with 8 chords, the full-bridge 8 steel pipes are changed into 5 multiplied by 8=40 days, the construction can be finished in the window time of 45 days, while the traditional method needs 64 days, the method is simple to operate, the difficulty and risk of the span of the double-track railway steel pipe concrete arch bridge in the plateau alpine region reaching more than 500m are reduced, the feasibility is greatly improved, the construction cost is hardly increased, the method is a steel pipe concrete arch bridge pouring construction method worthy of being popularized in the plateau alpine region, and is also suitable for the construction of the large-span steel pipe concrete arch bridge in the conventional environment region with high requirements on the construction period;
2. when the upper chord upper bin concrete is poured, positive bending moment is generated in the length range from two side arch feet to about 1/6 of the midspan of the full-bridge arch ring, the positive bending moment enables the upper chord steel pipe of the arch ring with the length of 1/6 to be pressed, and the corresponding lower chord steel pipe is pulled, so that the upper chord lower bin concrete poured firstly is pressed, and tensile stress does not occur; therefore, under the condition of ensuring the quality of concrete, the upper chord steel pipe allows the upper chord lower bin concrete to be aged for only about 1 day (the concrete is subjected to final setting), and the upper chord upper bin and the upper chord middle bin concrete can be poured in one day (the concrete amount is poured in one day), so that the construction time is saved; the upper chord steel pipe is novel in form, simple in construction, excellent in effect, very suitable for popularization, suitable for construction of a large-span steel pipe concrete arch bridge in a highland and alpine region with a short construction window period, and simultaneously suitable for construction of a large-span steel pipe concrete arch bridge in a conventional environment region with high requirements on construction period;
3. according to the large-span steel pipe concrete arch bridge lower chord steel pipe, when the lower chord lower bin concrete is poured, negative bending moment is generated by about 1/3 lengths of the upper part of a full bridge arch ring, the negative bending moment enables the lower chord steel pipe of the arch ring with the length of 1/3 to be pressed, and the corresponding upper chord steel pipe is pulled, so that the lower chord upper bin concrete poured in advance is in a pressed state, and tensile stress does not occur; therefore, under the condition of ensuring the quality of concrete, the lower chord steel pipe allows the lower chord upper bin concrete to be aged for only about 1 day (the concrete is subjected to final setting), and the lower chord lower bin concrete can be poured subsequently, so that the waiting time which is more than 4 days and is necessary in the traditional construction method is saved, the construction time is greatly saved, and the characteristic of short construction window period of the large-span steel pipe concrete arch bridge in the plateau alpine region can be adapted; the lower chord steel pipe is novel in form, simple in construction, excellent in effect and very suitable for popularization, and is also suitable for construction of large-span steel pipe concrete arch bridges with high requirements for construction periods in conventional environmental areas.
Drawings
FIG. 1 is a schematic structural diagram of a long-span concrete-filled steel tube arch bridge in the embodiment;
FIG. 2 is a schematic cross-sectional view of a rib of an arch bridge of an embodiment;
FIG. 3 is a schematic view of the assembled steel tube arch rib hoisted by cables;
FIG. 4 is a schematic view of the sectional filling of the lower chord steel tube in the embodiment;
FIG. 5 is a schematic view of the sectional filling of the upper chord steel pipe in the embodiment;
fig. 6 is a schematic diagram of the conventional chord steel pipe warehouse filling in the comparative example.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1, the large-span concrete-filled steel tube arch bridge in a severe cold region on a certain plateau is a 550m main span deck concrete-filled steel tube arch bridge, the rise height is 132m, the rise-span ratio is 1/4.17, and arch ribs adopt N-shaped trusses; as shown in FIG. 2, the bridge is provided with two main trusses transversely, each main truss adopts 4-limb steel tube concrete arch ribs, and the full bridge is provided with 8-limb steel tubes which comprise 4-limb lower chord steel tubes and corresponding 4-limb upper chord steel tubes.
The method for pouring concrete in the pipe of the large-span concrete-filled steel tube arch bridge in the plateau alpine region comprises the following steps:
as shown in fig. 3, the steel tube arch ribs are assembled by adopting a cable hoisting method, cable hoisting devices are arranged on two banks, the arch rib segments are hoisted, meanwhile, the buckling cables of the arch ribs are tensioned, the steel tube arch ribs are assembled section by section from the arch springing until the steel tube arch ribs are closed, and the full-bridge steel tube erection is finished.
And (3) removing the buckle cables after the steel tube arch ribs are closed, and performing in-tube concrete pouring on 8 steel tubes, wherein the pouring sequence of the steel tubes is performed according to the steel tube numbering sequence shown in figure 2.
Specifically, for the same steel pipe truss piece of the arch rib, the lower chord steel pipe is firstly poured, and then the upper chord steel pipe is poured, and for a plurality of truss arch ribs, the steel pipe truss piece on the inner side of the arch ring is firstly poured, and then the steel pipe truss piece on the outer side of the arch ring is poured.
That is, as shown in fig. 2, the lower chord steel pipe on the inner side of the arch ring with the number 1 is poured first, and then the lower chord steel pipe on the inner side of the arch ring with the number 2 is poured;
then, the upper chord steel pipe on the inner side of the arch ring with the number 3 is poured, then the upper chord steel pipe on the inner side of the arch ring with the number 4 is poured, and the pouring sequence of the upper chord steel pipes with the numbers 3 and 4 can be exchanged;
then, pouring the lower chord steel pipe on the outer side of the arch ring with the number 5 and the lower chord steel pipe on the outer side of the arch ring with the number 6, wherein the pouring sequences of the lower chord steel pipe and the lower chord steel pipe can be exchanged;
and finally, pouring the steel pipe with the number 7 outside the arch ring and the steel pipe with the number 8 outside the arch ring, wherein the pouring sequence of the steel pipe with the number 7 outside the arch ring and the steel pipe with the number 8 outside the arch ring can be exchanged.
As shown in fig. 4, for all the lower-chord steel pipes, the lower-chord steel pipes are divided into a lower-chord upper bin and a lower-chord lower bin by using a lower-chord partition (specifically, a lower-chord partition panel), the lower-chord partition is arranged in a full-arch length 1/3 position area (from the arch springing), the lower-chord upper bin is filled with concrete first, and then the lower-chord lower bin is filled.
The mechanical principle of the pouring method is that when the lower chord lower bin concrete is poured, the upper part of the full-bridge arch ring is about 1/3 in length to generate a hogging moment, the hogging moment enables the lower chord steel pipe of the arch ring with 1/3 length to be pressed, and the corresponding upper chord steel pipe is pulled, so that the lower chord upper bin concrete poured firstly is in a pressed state.
Specifically, the precise position of the lower chord partition arranged in the position area of the full arch length 1/3 is determined according to the wall thickness of the lower chord steel pipe and/or the rigidity of the full bridge steel pipe by using finite element calculation.
For all the upper chord steel pipes, as shown in fig. 5, the upper chord steel pipes are divided into an upper chord upper bin, an upper chord middle bin and an upper chord lower bin by an upper chord partition (specifically, an upper chord partition panel), the upper chord partition between the upper chord upper bin and the upper chord middle bin is arranged in a full-arch-length 1/3 position area (from the arch springing), the upper chord partition between the upper chord middle bin and the upper chord lower bin is arranged in a full-arch-length 1/6 position area (from the arch springing), the upper chord lower bin is firstly poured with concrete, then the upper chord upper bin is poured, and finally the upper chord middle bin is poured.
The mechanical principle of the pouring method is that when the upper chord upper bin concrete is poured, positive bending moment is generated in the length range from two side arch feet of the full-bridge arch ring to about 1/6 length of the mid-span, the positive bending moment enables the upper chord steel pipe of the 1/6 length arch ring to be pressed, the corresponding lower chord steel pipe is pulled, and therefore the upper chord lower bin concrete poured in advance is pressed.
Specifically, the precise position of the upper chord partition arranged in the full-arch length 1/3 position area between the upper chord upper bin and the upper chord middle bin is determined according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full-bridge steel pipe by utilizing finite element calculation, and the precise position of the upper chord partition arranged in the full-arch length 1/6 position area between the upper chord middle bin and the upper chord lower bin is determined according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full-bridge steel pipe by utilizing finite element calculation.
Comparative example
In the embodiment, a large-span concrete-filled steel tube arch bridge in a severe cold region on a plateau is constructed by adopting a traditional arch foot-arch crown section-by-section cabin-by-section pouring method, as shown in fig. 6, for any chord steel tube, a cabin partition plate is arranged in a full-arch length 1/4 position area (from the arch foot), and the chord steel tube is divided into an upper cabin and a lower cabin, so that the concrete pouring amount of the upper cabin and the concrete pouring amount of the lower cabin are approximately equal, the pouring time of the two cabin sections is basically the same, the lower cabin is poured at the same time at the two sides, and then the upper cabin is poured.
Comparative analysis
Based on the above, the traditional arch springing-vault section-by-section warehouse-dividing pouring method is adopted for construction, in order to avoid tensile cracking of the lower warehouse concrete due to the fact that the lower warehouse concrete does not reach the strength, the age of the lower warehouse concrete is required to be more than 4 days when the upper warehouse is poured, and the time for pouring the concrete by the 8 full-bridge steel pipes is at least 8 × 2 × 4=64 days.
By adopting the method for pouring the concrete in the pipe of the large-span concrete-filled pipe arch bridge in the alpine region in the plateau, the pouring time of each steel pipe is increased by one day, namely the construction period of each steel pipe is changed into 5 days, for the concrete-filled pipe arch bridge with 8 chord members, the number of the 8 steel pipes in the full bridge is changed into 5 multiplied by 8=40 days, and the construction can be finished in the window time of 45 days.
By adopting the method for pouring concrete in the pipe of the large-span concrete-filled steel pipe arch bridge in the alpine region in the plateau, different bin separation modes and pouring sequences are respectively adopted for the lower chord steel pipe and the upper chord steel pipe, so that a novel bin separation sequence adjusting loading pouring method for the large-span concrete-filled steel pipe arch bridge is formed, when concrete of a subsequent bin is poured, the concrete of the previously poured bin is in a pressed state, the early concrete is prevented from being cracked by tension, the construction quality of the concrete cannot be influenced even if the final setting time is passed and the strength is not high, the problem of time control in the 4-day age is solved, and the problem cannot be solved by the traditional bin separation and pouring sequences; the method can control the pouring time of 8 steel pipes of the full bridge to be 40 days, can finish construction within 45-day window time, needs 64 days in the traditional method, is simple to operate, reduces the difficulty and risk of the span of the double-track railway steel pipe concrete arch bridge in plateau alpine regions to reach more than 500m, greatly improves the feasibility, hardly increases the construction cost, is a steel pipe concrete arch bridge pouring construction method worthy of popularization in plateau alpine regions, and is also suitable for the construction of large-span steel pipe concrete arch bridges in conventional environmental regions with high requirements on construction periods.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method is characterized in that for a lower chord steel pipe, the lower chord steel pipe is divided into a lower chord upper bin and a lower chord lower bin by a lower chord partition, the lower chord partition is arranged in a full-arch length 1/3 area, the lower chord upper bin is firstly filled with concrete, and then the lower chord lower bin is filled.
2. The perfusion method according to claim 1, wherein for the upper chord steel pipe, the upper chord steel pipe is divided into an upper chord upper chamber, an upper chord middle chamber and an upper chord lower chamber by an upper chord partition, the upper chord partition between the upper chord upper chamber and the upper chord middle chamber is arranged in a full arch length 1/3 position area, the upper chord partition between the upper chord middle chamber and the upper chord lower chamber is arranged in a full arch length 1/6 position area, the upper chord lower chamber is perfused with concrete first, then the upper chord upper chamber is perfused, and finally the upper chord middle chamber is perfused.
3. The perfusion method according to claim 2, wherein the lower chord steel tube is perfused first and then the upper chord steel tube is perfused for the same steel tube truss piece of the arch rib.
4. A method of infusion according to claim 2, wherein for a plurality of truss ribs, the steel tube truss sections on the inside of the arch ring are infused first, and then the steel tube truss sections on the outside of the arch ring are infused.
5. The perfusion method according to any one of claims 2-4, wherein the precise position of the upper chord partition between the upper chord upper chamber and the upper chord middle chamber in the position area of the full arch length 1/3 is determined according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full bridge steel pipe;
and determining the precise position of the upper chord partition arranged between the upper chord middle bin and the upper chord lower bin in the position area of the full arch length 1/6 according to the wall thickness of the upper chord steel pipe and/or the rigidity of the full bridge steel pipe.
6. The perfusion method according to any one of claims 1-4, wherein the precise position of the lower chord partition in the region of the position of the full arch length 1/3 is determined according to the wall thickness of the lower chord steel tube and/or the rigidity of the full bridge steel tube.
7. A method of infusion according to any one of claims 1 to 4, wherein the erection of the steel tube ribs is carried out by cable hoisting.
8. An upper chord steel tube of a large-span concrete-filled steel tube arch bridge, which is characterized by comprising an upper chord upper bin, an upper chord middle bin and an upper chord lower bin, wherein an upper chord partition is arranged between the upper chord middle bin and the upper chord lower bin and is arranged in a position area of 1/6 of the full arch length, an upper chord partition is arranged between the upper chord upper bin and the upper chord middle bin and is arranged in a position area of 1/3 of the full arch length, and the upper chord steel tube is subjected to concrete pouring by adopting the pouring method as claimed in any one of claims 2 to 5.
9. A large-span steel pipe concrete arch bridge lower chord steel pipe is characterized by comprising a lower chord upper bin and a lower chord lower bin, wherein a lower chord partition is arranged between the lower chord upper bin and the lower chord lower bin, the lower chord partition is arranged in the position area of 1/3 parts of the full arch length, and the lower chord steel pipe is subjected to concrete pouring by adopting the pouring method according to any one of claims 1 to 7.
10. A long span concrete filled steel tube arch bridge constructed by the pouring method according to any one of claims 1 to 7.
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